CN116318449A - Temperature calibration method and device - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
- G01D18/008—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00 with calibration coefficients stored in memory
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
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- G—PHYSICS
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- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
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Abstract
The invention provides a temperature calibration method and a device, which relate to the technical field of communication, wherein the temperature calibration method comprises the following steps: acquiring a plurality of calibration powers and a plurality of calibration frequencies; setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency; acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values; and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument. The accuracy of temperature calibration and the accuracy and adaptability of power compensation are improved, and the data storage capacity is greatly reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a temperature calibration method and apparatus.
Background
With the development of communication technology, the requirements on radio frequency link indexes in measuring instruments or meters required for communication are becoming more and more strict, and in particular, the requirements on power accuracy are becoming more and more strict. However, due to the characteristics of devices in the radio frequency link, the output characteristic indexes are different in different temperature environments, so that the output power is influenced, the precision of the power is reduced, and the measuring accuracy of the instrument is influenced; with the format diversity of communication, the radio frequency link becomes more and more complex, and the requirement on temperature compensation precision is higher and higher. Accordingly, there is a need for an effective method to solve the above-mentioned problems.
Disclosure of Invention
Aiming at the problems existing in the prior art, the embodiment of the invention provides a temperature calibration method and device.
The invention provides a temperature calibration method, which comprises the following steps:
acquiring a plurality of calibration powers and a plurality of calibration frequencies;
setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency;
acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values;
and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
According to the temperature calibration method provided by the invention, the quadratic term fitting is performed according to the first calibration power, the at least three temperatures and the actual powers to obtain the fitting coefficient corresponding to the temperature and the power difference value, and the method comprises the following steps:
calculating a power difference value between each actual power and the first calibration power;
And performing quadratic term fitting on each temperature and the power difference value corresponding to each temperature by using a least square method to obtain a fitting coefficient corresponding to the temperature and the power difference value.
According to the temperature calibration method provided by the invention, before the fitting coefficient, the first calibration power and the first calibration frequency are stored in the calibration table of the instrument, the method further comprises the following steps:
obtaining the fitting degree of the quadratic term fitting;
accordingly, the storing the fitting coefficient, the first calibration power and the first calibration frequency in the calibration table of the meter includes:
and under the condition that the fitting degree is larger than or equal to a preset threshold value, storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument in a correlation way.
According to the temperature calibration method provided by the invention, after the fitting degree of the quadratic term fitting is obtained, the method further comprises the following steps:
and under the condition that the fitting degree is smaller than a preset threshold value, adjusting the instrument, and continuously executing the step of setting the output power of the instrument to be the first calibration power.
According to the temperature calibration method provided by the invention, after the fitting coefficient, the first calibration power and the first calibration frequency are stored in the calibration table of the instrument in an associated manner, the temperature calibration method further comprises the following steps:
When the meter is used for measuring the power of the radio frequency signal, the current output power and the current working frequency of the meter are identified;
determining at least one target calibration power associated with the current output power and at least one target calibration frequency associated with the current operating frequency;
obtaining a corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference value according to the target fitting coefficient and the current temperature;
and carrying out power deviation compensation based on the target power difference value.
According to the temperature calibration method provided by the invention, the obtaining the corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining the target power difference according to the target fitting coefficient and the current temperature comprises the following steps:
acquiring a target fitting coefficient stored in association with the target calibration power and the target calibration frequency from the calibration table under the condition that the current output power is the target calibration power and the current working frequency is the target calibration frequency;
And inputting the current target temperature into a fitting function corresponding to the target fitting coefficient for calculation, and obtaining a target power difference value.
According to the temperature calibration method provided by the invention, the obtaining the corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining the target power difference according to the target fitting coefficient and the current temperature comprises the following steps:
obtaining target fitting coefficients stored in association with each target content from the calibration table under the condition that the current output power is not the target calibration power and/or the current working frequency is not the target calibration frequency, wherein the target content comprises any target calibration power and any target calibration frequency;
inputting the current target temperature into fitting functions corresponding to the target fitting coefficients to calculate, and obtaining a plurality of initial power difference values;
and calling a Lagrangian difference method to process the initial power differences to obtain a target power difference.
The invention also provides a temperature calibration device, comprising:
a first acquisition module configured to acquire a plurality of calibration powers and a plurality of calibration frequencies;
The device comprises a setting module, a control module and a control module, wherein the setting module is configured to set the output power of a meter as first calibration power and set the working frequency of the meter as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency;
the acquisition module is configured to acquire the actual power of the instrument at least three temperatures respectively, and perform quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to the temperature and power difference values;
a logging module configured to correlate the fitting coefficient, the first calibration power, and the first calibration frequency into a calibration table of the meter.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the temperature calibration method as described in any of the above when executing the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a temperature calibration method as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a temperature calibration method as described in any one of the above.
According to the temperature calibration method provided by the invention, the output power of the instrument is set as the first calibration power by acquiring a plurality of calibration powers and a plurality of calibration frequencies, the working frequency of the instrument is set as the first calibration frequency, the actual powers of the instrument at least three temperatures are respectively acquired, and quadratic term fitting is carried out according to the first calibration power, at least three temperatures and each actual power to obtain a fitting coefficient corresponding to a temperature and power difference; the fitting coefficient, the first calibration power and the first calibration frequency are stored in a calibration table of the meter. The accuracy of temperature calibration is improved, the accuracy and adaptability of power compensation of different instruments can be improved, and the error of the obtained target power difference value is reduced. And when the standard frequency and the standard power are more, the power difference value at each temperature is not required to be stored according to the combination of the standard frequency and the standard power, and the fitting coefficient corresponding to the temperature and the power difference value is only required to be stored according to the combination of the standard frequency and the standard power, so that the data storage quantity is greatly reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a radio frequency link provided by the present invention;
FIG. 2 is a schematic flow chart of a temperature calibration method according to the present invention;
FIG. 3 is a second flow chart of the temperature calibration method according to the present invention;
FIG. 4 is a schematic diagram of a temperature calibration device according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate a clearer understanding of various embodiments of the present invention, some relevant background knowledge is first presented as follows.
With the development of communication technology, the requirements on radio frequency link indexes in measuring instruments or meters required for communication are becoming more and more strict, and in particular, the requirements on power accuracy are becoming more and more strict. However, due to the characteristics of devices in the radio frequency link, the output characteristic indexes are different in different temperature environments, so that the output power is influenced, the precision of the power is reduced, and the measuring accuracy of the instrument is influenced; with the format diversity of communication, the radio frequency link becomes more and more complex, and the requirement on temperature compensation precision is higher and higher. For example, fig. 1 shows a radio frequency link, and fig. 1 is a schematic structural diagram of the radio frequency link provided by the present invention: intermediate frequency high-speed Digital-to-Analog Converter (DAC) and local oscillator are mixed for multiple times and output, and then the signals are processed by a signal processing unit (filtering, numerical control, amplifying, 4-stage Digital attenuator and the like) and finally output.
In the prior art, the instrument is usually placed in an incubator, and different temperatures are traversed to obtain different powers. After the traversal is completed, a temperature and power lookup table is built and stored in the meter. When the output power is set, firstly determining the calibration power corresponding to the output power, then searching the calibration power corresponding to the output power and the calibration temperature corresponding to the calibration power based on the temperature and power lookup table, and passing through a compensation function: f (X) = (y 0-y 1)/(X0-X1) ×x, where F (X) is a power compensation value (power difference), y0 and y1 are calibration powers, X0 is a calibration temperature corresponding to the calibration power y0, X1 is a calibration temperature corresponding to the calibration power y1, and X represents the current temperature.
However, in the prior art, a temperature and power lookup table needs to be established, when the frequency and the power are more, corresponding relations between all temperatures and the power need to be stored corresponding to each power under different frequencies, so that the data volume needed to be stored is larger. And when power is collected, whether the data are normal cannot be judged in real time, if the data are incorrect due to sporadic errors, an error temperature and power lookup table is built, the error can be displayed only at a special temperature, and more time is consumed to position errors. Furthermore, for different radio frequency links, the temperature and power may not exhibit a single primary linear relationship, such as the meters used in the radio frequency links shown in fig. 1, and in a pass-through link, the temperature and power difference exhibits a quadratic relationship, i.e., the adaptation of the radio frequency link is limited by the single primary linear relationship between temperature and power.
The invention provides a temperature calibration method and a temperature calibration device, which are characterized in that by acquiring a plurality of calibration powers and a plurality of calibration frequencies, the output power of an instrument is set as first calibration power, the working frequency of the instrument is set as first calibration frequency, the actual powers of the instrument at least three temperatures are respectively acquired, and quadratic term fitting is carried out according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values; the fitting coefficient, the first calibration power and the first calibration frequency are stored in a calibration table of the meter. The accuracy of temperature calibration is improved, the accuracy and adaptability of power compensation of different instruments can be improved, and the error of the obtained target power difference value is reduced. And when the standard frequency and the standard power are more, the power difference value at each temperature is not required to be stored according to the combination of the standard frequency and the standard power, and the fitting coefficient corresponding to the temperature and the power difference value is only required to be stored according to the combination of the standard frequency and the standard power, so that the data storage quantity is greatly reduced.
In addition, the relationship between the temperature and the power difference is in a linear relationship, but the primary term fitting has limitation, the secondary term fitting is carried out through a least square method, and the fitting coefficient is obtained. And the non-calibration points are calculated by a Lagrange interpolation method, and the linear interpolation of multiple terms can be automatically expanded according to the link characteristics, so that the calculation is more flexible, and the accuracy of power compensation is improved.
The temperature calibration method and apparatus of the present invention are described below with reference to fig. 2-4.
Fig. 2 is a schematic flow chart of the temperature calibration method provided by the present invention, referring to fig. 2, including steps 201 to 204, wherein:
step 201: a plurality of calibration powers and a plurality of calibration frequencies are acquired.
It should be noted that the execution subject of the present invention may be any electronic device for performing temperature calibration, and is mainly used for verifying temperature compensation of a radio frequency link in the communication field.
Specifically, the calibration power refers to a standard power for calibration. The calibration frequency refers to a standard frequency for calibration.
In practical applications, there are various methods for obtaining multiple calibration powers and multiple calibration frequencies. The invention is not limited in this regard.
Illustratively, the user fills in the plurality of calibration powers and the plurality of calibration frequencies through the temperature calibration setup page, and accordingly, the execution subject acquires the plurality of calibration powers and the plurality of calibration frequencies.
Illustratively, the executing body receives a temperature calibration instruction or a calibration power and calibration frequency acquisition instruction, and accordingly, the executing body acquires a plurality of calibration powers and a plurality of calibration frequencies from a memory area to which the temperature calibration instruction or the calibration power and calibration frequency acquisition instruction is directed.
Step 202: setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency.
In particular, the meter refers to a radio frequency meter, i.e. a measuring meter required for communication. The output power refers to the desired or target power of the meter being set. The operating frequency refers to the frequency of the meter being set up when in use, or the frequency of the radio frequency link.
In practical applications, on the basis of obtaining a plurality of calibration powers and a plurality of calibration frequencies, further, different calibration powers and a plurality of calibration frequencies may be combined, i.e. each calibration power and each calibration frequency may be combined. For example, there are 2 calibration powers and 3 calibration frequencies, then the first calibration power is combined with each calibration frequency to obtain 3 combinations, and the second calibration power is combined with each calibration frequency to obtain 3 combinations, and a total of 6 combinations are obtained.
Each combination includes a calibration power and a calibration frequency. For each combination, the output power of the meter is set to the calibration power in that combination, and the operating frequency of the meter is set to the calibration frequency in that combination. Then, a temperature calibration at the calibration power and the calibration frequency may be performed.
In addition, before setting, the power calibration can be carried out on the instrument to obtain the corresponding attenuation state under the corresponding power. For example, the calibration frequency is 6G, the calibration power is 5dBm and 0dBm, the output power is 5dBm by setting the attenuation state T1, and the output power is 0dBm by setting the attenuation state T2. When the meter is set to 6G and the output power is 5dBm, the T1 attenuation state is called, and when the output power is set to 0dBm, the T2 attenuation state is called. The one-to-one correspondence between the output power and the attenuation state is the power calibration. In this way, the accuracy of the temperature calibration can be further improved.
Step 203: and acquiring the actual power of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to the temperature and power difference values.
Specifically, the actual power refers to the power emitted by the radio frequency signal. Fitting coefficients refer to coefficients in a function formed by fitting. The power difference value refers to a power deviation value.
In practical applications, at each combination of calibration power and calibration frequency, to improve the accuracy of temperature calibration, it is necessary to collect the actual power at least three temperatures. Under the condition that the output power of the instrument is set to be a certain calibration power and the working frequency of the instrument is set to be a certain calibration frequency, the radio frequency module PCB of the instrument is firstly adjusted to a first temperature, and the instrument is tested to obtain a first actual power of the instrument. And then the radio frequency module PCB of the instrument is adjusted to a second temperature, the instrument is tested to obtain a second actual power of the instrument, and the like until at least three temperatures are traversed to obtain at least three actual powers.
Further, performing quadratic term fitting on at least three temperatures corresponding to the calibration power and at least three actual powers to obtain a quadratic function of the temperature and the power difference and coefficients corresponding to the quadratic function, namely fitting coefficients, wherein the quadratic function is shown as a formula (1).
In the formula (1), y represents a power difference value, x represents a temperature, and a, b and c are fitting coefficients.
Step 204: and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
Specifically, the calibration table refers to a table for performing temperature calibration, which is stored in the storage of the meter.
And further, on the basis of obtaining the fitting coefficient corresponding to the temperature and power difference value under the condition that the first calibration power and the first calibration frequency are obtained, storing the fitting coefficient, the first calibration power and the first calibration frequency into a calibration table of the instrument.
And then traversing the combination of each calibration power and the calibration frequency to obtain fitting coefficients corresponding to the combination of different calibration powers and different calibration frequencies, and storing the fitting coefficients in a calibration table of the instrument in a correlation manner.
According to the temperature calibration method provided by the invention, the output power of the instrument is set as the first calibration power by acquiring a plurality of calibration powers and a plurality of calibration frequencies, the working frequency of the instrument is set as the first calibration frequency, the actual powers of the instrument at least three temperatures are respectively acquired, and quadratic term fitting is carried out according to the first calibration power, at least three temperatures and each actual power to obtain a fitting coefficient corresponding to a temperature and power difference; the fitting coefficient, the first calibration power and the first calibration frequency are stored in a calibration table of the meter. The accuracy of temperature calibration is improved, the accuracy and adaptability of power compensation of different instruments can be improved, and the error of the obtained target power difference value is reduced. And when the standard frequency and the standard power are more, the power difference value at each temperature is not required to be stored according to the combination of the standard frequency and the standard power, and the fitting coefficient corresponding to the temperature and the power difference value is only required to be stored according to the combination of the standard frequency and the standard power, so that the data storage quantity is greatly reduced.
Alternatively, in order to improve the fitting accuracy and the fitting efficiency, the quadratic term fitting may be performed by using a least square method. That is, the fitting of the quadratic term is performed according to the first calibration power, the at least three temperatures, and the actual powers to obtain a fitting coefficient corresponding to the temperature and the power difference, which may be specifically implemented as follows:
calculating a power difference value between each actual power and the first calibration power;
and performing quadratic term fitting on each temperature and the power difference value corresponding to each temperature by using a least square method to obtain a fitting coefficient corresponding to the temperature and the power difference value.
Specifically, the least square method, i.e., the least squares method, is a mathematical optimization technique that finds the best function match for the data by minimizing the sum of squares of the errors; unknown data can be simply obtained by using a least square method, and the square sum of errors between the obtained data and actual data is minimized; the least squares method can also be used for curve fitting.
In practical applications, the difference between the first calibration power and each actual power, i.e. the power difference, may be calculated. Then, a quadratic term fitting is carried out on each temperature and the power difference value corresponding to each temperature by using a least square method as shown in a formula (2), and a fitting coefficient corresponding to the temperature and the power difference value under the first calibration power and the first calibration frequency is obtained.
In the formula (2), f (x) represents a power difference value, x represents a temperature, a 1 To a m Are all fitting coefficients phi 1 (x) To phi m (x) Each representing a set of linearly independent functions preselected for temperature, m representing m fitting coefficients. Since a quadratic fit is performed, m=3, Φ 1 （x）=x 2 ，φ 2 （x）=x，φ 3 （x）=x 0 =1。
Therefore, a quadratic term fitting mode is directly adopted for the temperature and power difference values through a least square method, so that the fitting coefficient of the temperature and power difference values is obtained, the efficiency of obtaining the fitting coefficient is improved while the fitting coefficient is accurately obtained, and the efficiency of temperature compensation is further improved.
Optionally, the quadratic term fitting can be performed on each temperature and the power difference value corresponding to each temperature by using a newton interpolation method, a newton iteration method, an interval dichotomy method, a chord cut method, a jacobian iteration method, a newton kottky numerical integration method and the like. The present invention is not limited in any way.
In one or more optional embodiments of the present invention, on the basis of determining the fitting coefficient, the first calibration power and the first calibration frequency may be directly stored in the calibration table of the meter, so that the flow may be simplified, other complicated processes may be avoided, and further, the rate of temperature calibration may be improved.
In one or more alternative embodiments of the invention, verification of the collected data (actual power) is required in order to ensure temperature calibration efficiency. And carrying out association storage under the condition that the verification passes. That is, before the fitting coefficient, the first calibration power, and the first calibration frequency are stored in the calibration table of the meter, the method further includes:
obtaining the fitting degree of the quadratic term fitting;
correspondingly, the fitting coefficient, the first calibration power and the first calibration frequency are stored in a calibration table of the instrument in an associated manner, and the specific implementation process can be as follows:
and under the condition that the fitting degree is larger than or equal to a preset threshold value, storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument in a correlation way.
Specifically, the Goodness of Fit (Goodness of Fit) refers to the degree of Fit of the regression line to the observed value, and the statistic for measuring the Goodness of Fit is a determinable coefficient, namely the degree of Fit, denoted by R, where the maximum value of R is 1: the closer the value of R is to 1, the better the fitting degree of the regression line to the observed value is; conversely, the smaller the value of R, the worse the fit of the regression line to the observed value. The preset threshold is a preset fitness threshold.
In practical application, when the quadratic term fitting is performed, the linear relation of the temperature and the power difference value is intuitively reflected according to the fitting degree, so that the fitting degree of the quadratic term fitting can be obtained. Then, by setting a preset threshold value, judging whether the power data (actual power) acquisition is abnormal or not in real time: under the condition that the fitting degree is larger than or equal to a preset threshold value, the actual power is normally acquired, no error is introduced in the acquisition process, the fitting coefficient is accurate, and at the moment, the fitting coefficient, the first calibration power and the first calibration frequency can be stored in a calibration table of the instrument in an associated mode.
Therefore, when the temperature and power difference values are fitted, the fitting degree is obtained, whether errors are introduced or not is judged according to the fitting degree and the larger preset threshold value, problems can be found in advance, and sporadic errors can be detected in real time.
In one or more optional embodiments of the invention, after the obtaining the fitting degree of the quadratic term fitting, the method further includes:
and under the condition that the fitting degree is smaller than a preset threshold value, adjusting the instrument, and continuously executing the step of setting the output power of the instrument to be the first calibration power.
In practical application, when the fitting degree is smaller than a preset threshold, the actual power acquisition is abnormal, errors are introduced in the acquisition process, the fitting coefficient is inaccurate, at this time, the instrument is adjusted, and then the actual power acquisition is restarted, namely, the steps of setting the output power of the instrument to be the first calibration power and later are executed.
Therefore, when the temperature and the power difference value are fitted, the fitting degree is obtained, whether errors are introduced or not is judged according to the fitting degree and the larger preset threshold value, the problem can be found in advance, the occasional errors are detected in real time, and when the errors are introduced, the actual power at the temperature can be collected again, so that the reliability and the accuracy of temperature calibration are effectively ensured.
Referring to fig. 3, fig. 3 is a second flow chart of the temperature calibration method according to the present invention: on the basis of determining N calibration powers and M calibration frequencies (N and M are integers greater than 1), the calibration powers are set first, i.e., let i=1, and the i-th calibration power is taken as the output power of the meter. Setting the calibration frequency again, i.e. let j=1, and taking the jth calibration frequency as the operating frequency of the instrument. Then, performing quadratic term fitting to obtain a fitting coefficient and fitting degree, namely, the actual power of the acquisition instrument at K temperatures respectively, wherein K is an integer greater than 2; and fitting the temperature and power difference values according to the ith calibration power, the K temperatures and the actual powers to obtain a fitting coefficient and a fitting degree. And further, judging whether the fitting degree is larger than or equal to a preset threshold value, if not, returning to restart, and if so, storing the coefficient of the quadratic function, the ith calibration power and the jth calibration frequency in a calibration table in a correlation manner.
Then judging whether the calibration frequency is the last calibration frequency, if not, returning to set the calibration frequency, namely, if j is smaller than M, enabling j=j+1, and continuously executing the step of taking the j calibration frequency as the working frequency of the instrument; if not, it is determined whether the last calibration power, i.e., if j is equal to M, whether i is equal to N. If the power is not the last calibration power, returning to set the calibration power, namely, if i is smaller than N, enabling i=i+1 and j=1, and continuously executing the step of taking the ith calibration power as the output power of the instrument; if the power is the last calibration power, the acquisition is ended, namely, if i is equal to N.
It should be noted that, after the temperature calibration of the meter, the temperature compensation, that is, the power deviation compensation, may also be performed using the meter. That is, after the fitting coefficient, the first calibration power, and the first calibration frequency are stored in the calibration table of the meter, the method further includes:
when the meter is used for measuring the power of the radio frequency signal, the current output power and the current working frequency of the meter are identified;
determining at least one target calibration power associated with the current output power and at least one target calibration frequency associated with the current operating frequency;
Obtaining a corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference value according to the target fitting coefficient and the current temperature;
and carrying out power deviation compensation based on the target power difference value.
Specifically, the current output power refers to the current output power of the meter. The current operating frequency is the current operating frequency of the meter. The target calibration power refers to a calibration power corresponding to the current output power. The target calibration frequency refers to a calibration frequency corresponding to the current operating frequency.
In practical application, when the meter is used for measuring the radio frequency signal power, the temperature between boards of the meter may change, so that the actual power measured by the meter changes, and at this time, the power difference value corresponding to the current temperature needs to be selected again to perform power deviation compensation, namely power compensation, on the actual power.
The current output power and the current operating frequency of the meter may be identified and determined, then at least one target calibration power is determined based on the current output power, and at least one target calibration frequency is determined based on the current operating frequency. Further, according to each target calibration power and each target calibration frequency, a corresponding target fitting coefficient is obtained from a calibration table, then a target power difference value is reversely deduced based on the target fitting coefficient and the current temperature, and further power deviation compensation is carried out based on the target power difference value. In this way, the efficiency of temperature-based power compensation can be improved.
Alternatively, it may be determined whether the current output power and the current operating frequency are standard points. The target power difference is determined in different ways for standard and non-standard points.
Illustratively, the obtaining the corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining the target power difference according to the target fitting coefficient and the current temperature includes:
acquiring a target fitting coefficient stored in association with the target calibration power and the target calibration frequency from the calibration table under the condition that the current output power is the target calibration power and the current working frequency is the target calibration frequency;
and inputting the current target temperature into a fitting function corresponding to the target fitting coefficient for calculation, and obtaining a target power difference value.
Specifically, the current target temperature is the current temperature of the meter.
In practical application, when the current output power and the current operating frequency are both calibration points, that is, the current output power is one of a plurality of calibration powers, the current operating frequency is one of a plurality of calibration frequencies, at this time, the current output power is determined as the target calibration power, and the current operating frequency is determined as the target calibration frequency, that is, the target calibration power and the target calibration frequency are both one. Further, a target fitting coefficient associated with both the target calibration power and the target calibration frequency is obtained from the calibration table. And substituting the target fitting coefficient into a quadratic function to obtain a fitting function, and inputting the current target temperature into the fitting function to obtain a target power difference value. In this way, with the meter at the calibration point, the target power difference can be quickly determined based on the calibration table, thereby improving the efficiency of power compensation.
The method for determining the target power difference according to the target fitting coefficient and the current temperature may include the following steps:
obtaining target fitting coefficients stored in association with each target content from the calibration table under the condition that the current output power is not the target calibration power and/or the current working frequency is not the target calibration frequency, wherein the target content comprises any target calibration power and any target calibration frequency;
inputting the current target temperature into fitting functions corresponding to the target fitting coefficients to calculate, and obtaining a plurality of initial power difference values;
and calling a Lagrangian difference method to process the initial power differences to obtain a target power difference.
In practice, in case at least one of the current output power and the current operating frequency is not a calibration point, i.e. the current output power is not the target calibration power and/or the current operating frequency is not the target calibration frequency. At this time, at least one calibration power which is larger than the current output power and is closest to the current output power is selected as target calibration power, at least one calibration power which is smaller than the current output power and is closest to the current output power is selected as target calibration power, and at least two target calibration powers are obtained; likewise, at least one calibration frequency which is larger than the current working frequency and is closest to the current working frequency is selected as a target calibration frequency, and at least one calibration frequency which is smaller than the current working frequency and is closest to the current working frequency is selected as a target calibration frequency, so that at least two target calibration frequencies are obtained.
And then combining each target calibration power with each target calibration frequency to obtain a plurality of target contents. For example, there are 2 target calibration powers and 2 target calibration frequencies, a first target calibration power and a first target calibration frequency are combined, a first target calibration power and a second target calibration frequency are combined, a second target calibration power and a first target calibration frequency are combined, and a second target calibration power and a second target calibration frequency are combined, resulting in 4 target contents.
For each target content, a target fitting coefficient stored in association with the target content is obtained from a calibration table. And then, inputting the current target temperature into a fitting function corresponding to each target fitting coefficient to calculate so as to obtain a plurality of initial power difference values, and then, calling a Lagrangian difference method to process the plurality of initial power difference values so as to obtain a target power difference value. The Lagrangian difference method is shown in formula (3).
In the formula (3), L (x) represents a calculated power difference, such as a target difference power or an alternative difference power; x represents the current target temperature; y is j Represents the j-th coefficient; l (L) j (x) Representing a function corresponding to the power difference (e.g., initial difference power or alternative difference power) of the jth input.
That is, for non-calibration points (at least one of the current output power and the current operating frequency is not a calibration point), a corresponding initial power difference is calculated by selecting a plurality of calibration points that are correspondingly adjacent, and then a target power difference of the non-calibration point is calculated by a Lagrange interpolation method.
It should be noted that, for the case that the current output power is not the calibration power and the current working frequency is the calibration frequency, a plurality of initial power differences are linearly fitted through a primary term of the lagrangian interpolation method to obtain a target power difference; and for the case that the current working frequency is not the calibration frequency, linearly fitting a plurality of initial power differences through the cubic term of the Lagrange interpolation method to obtain a target power difference. Therefore, the non-calibration points are calculated by the Lagrange interpolation method, and the linear interpolation of multiple terms can be automatically expanded according to the link characteristics, so that the calculation is more flexible, and the accuracy of power compensation is improved.
Alternatively, the target power difference may also be determined in the same way for all current output powers and current operating frequencies. That is, the specific implementation process may be as follows:
Obtaining target fitting coefficients stored in association with each target content from the calibration table, wherein the target content comprises any target calibration power and any target calibration frequency;
inputting the current target temperature into fitting functions corresponding to the target fitting coefficients to calculate, and obtaining a plurality of initial power difference values;
calling a primary term of a Lagrangian difference method to linearly fit the plurality of initial power differences to process the plurality of initial power differences, so as to obtain a plurality of alternative power differences;
and calling a cubic term linear fitting of the Lagrangian difference method to process the plurality of alternative power differences, so as to obtain a plurality of target power differences.
For example, the current output power of the meter is P, and according to the current operating frequency being F, the corresponding calibration frequency in the calibration table is obtained first according to the current operating frequency being F: f1, F2, F3 and F4 (F1 is less than or equal to F4), and then fitting coefficients corresponding to the calibration powers P1 and P2 (P1 is less than or equal to P2) in the thermometer are obtained from frequency points of F1, F2, F3 and F4 in the thermometer according to the current output power P. Then according to the current target temperature, respectively calculating initial power difference values caused by the temperatures of P1 and P2 under the conditions of F1, F2, F3 and F4, and then according to one-time linear fitting of a Lagrange interpolation method, obtaining alternative power difference values caused by the temperatures of the current output power P under the conditions of F1, F2, F3 and F4; finally, according to the alternative power difference value caused by the temperature of the current output power P under F1, F2, F3 and F4, the target power difference value caused by the temperature of the current output power P under the current working frequency F is obtained by utilizing three-time item fitting of a Lagrange interpolation method, and the power compensation with the current working frequency F and the current output power P can be completed by compensating the target power difference value through a digital domain.
Therefore, the target power difference value is determined in the same mode aiming at all the current output power and the current working frequency, so that judgment errors can be avoided, power compensation is performed in an error mode, and the accuracy of power compensation is improved.
The temperature calibration device provided by the invention is described below, and the temperature calibration device described below and the temperature calibration method described above can be referred to correspondingly.
Fig. 4 is a schematic structural diagram of a temperature calibration device according to the present invention, and as shown in fig. 4, the temperature calibration device 400 includes: a first acquisition module 401, a setting module 402, an acquisition module 403, and a storing module 404, wherein:
a first acquisition module 401 configured to acquire a plurality of calibration powers and a plurality of calibration frequencies;
a setting module 402, configured to set the output power of the meter to a first calibration power, and set the operating frequency of the meter to a first calibration frequency, where the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency;
the acquisition module 403 is configured to acquire actual powers of the instrument at least three temperatures respectively, and perform quadratic term fitting according to the first calibration power, the at least three temperatures and each of the actual powers to obtain a fitting coefficient corresponding to a temperature and a power difference value;
A logging module 404 is configured to store the fitting coefficient, the first calibration power, and the first calibration frequency in a calibration table of the meter.
According to the temperature calibration device provided by the invention, the output power of the instrument is set as the first calibration power by acquiring a plurality of calibration powers and a plurality of calibration frequencies, the working frequency of the instrument is set as the first calibration frequency, the actual powers of the instrument at least three temperatures are respectively acquired, and quadratic term fitting is carried out according to the first calibration power, at least three temperatures and each actual power to obtain a fitting coefficient corresponding to a temperature and power difference; the fitting coefficient, the first calibration power and the first calibration frequency are stored in a calibration table of the meter. The accuracy of temperature calibration is improved, the accuracy and adaptability of power compensation of different instruments can be improved, and the error of the obtained target power difference value is reduced. And when the standard frequency and the standard power are more, the power difference value at each temperature is not required to be stored according to the combination of the standard frequency and the standard power, and the fitting coefficient corresponding to the temperature and the power difference value is only required to be stored according to the combination of the standard frequency and the standard power, so that the data storage quantity is greatly reduced.
Optionally, the acquisition module 403 is further configured to:
calculating a power difference value between each actual power and the first calibration power;
and performing quadratic term fitting on each temperature and the power difference value corresponding to each temperature by using a least square method to obtain a fitting coefficient corresponding to the temperature and the power difference value.
Optionally, the temperature calibration device 400 further includes a second acquisition module configured to:
obtaining the fitting degree of the quadratic term fitting;
accordingly, the logging module 404 is further configured to:
and under the condition that the fitting degree is larger than or equal to a preset threshold value, storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument in a correlation way.
Optionally, the temperature calibration device 400 further comprises an adjustment module configured to:
and under the condition that the fitting degree is smaller than a preset threshold value, adjusting the instrument, and continuously executing the step of setting the output power of the instrument to be the first calibration power.
Optionally, the temperature calibration device 400 further comprises a compensation module configured to:
when the meter is used for measuring the power of the radio frequency signal, the current output power and the current working frequency of the meter are identified;
Determining at least one target calibration power associated with the current output power and at least one target calibration frequency associated with the current operating frequency;
obtaining a corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference value according to the target fitting coefficient and the current temperature;
and carrying out power deviation compensation based on the target power difference value.
Optionally, the compensation module is further configured to:
acquiring a target fitting coefficient stored in association with the target calibration power and the target calibration frequency from the calibration table under the condition that the current output power is the target calibration power and the current working frequency is the target calibration frequency;
and inputting the current target temperature into a fitting function corresponding to the target fitting coefficient for calculation, and obtaining a target power difference value.
Optionally, the compensation module is further configured to:
obtaining target fitting coefficients stored in association with each target content from the calibration table under the condition that the current output power is not the target calibration power and/or the current working frequency is not the target calibration frequency, wherein the target content comprises any target calibration power and any target calibration frequency;
Inputting the current target temperature into fitting functions corresponding to the target fitting coefficients to calculate, and obtaining a plurality of initial power difference values;
and calling a Lagrangian difference method to process the initial power differences to obtain a target power difference.
Fig. 5 illustrates a physical schematic diagram of an electronic device, as shown in fig. 5, which may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a temperature calibration method comprising: acquiring a plurality of calibration powers and a plurality of calibration frequencies; setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency; acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values; and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the temperature calibration method provided by the methods described above, the method comprising: acquiring a plurality of calibration powers and a plurality of calibration frequencies; setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency; acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values; and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the temperature calibration method provided by the above methods, the method comprising: acquiring a plurality of calibration powers and a plurality of calibration frequencies; setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency; acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values; and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of temperature calibration, comprising:
acquiring a plurality of calibration powers and a plurality of calibration frequencies;
setting the output power of the instrument as first calibration power, and setting the working frequency of the instrument as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency;
acquiring actual powers of the instrument at least three temperatures respectively, and performing quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to temperature and power difference values;
and storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument.
2. The method of claim 1, wherein performing quadratic term fitting according to the first calibration power, the at least three temperatures, and the actual powers to obtain a fitting coefficient corresponding to a difference between the temperatures and the powers, includes:
calculating a power difference value between each actual power and the first calibration power;
and performing quadratic term fitting on each temperature and the power difference value corresponding to each temperature by using a least square method to obtain a fitting coefficient corresponding to the temperature and the power difference value.
3. The temperature calibration method according to claim 1 or 2, characterized in that before the correlation of the fitting coefficient, the first calibration power and the first calibration frequency is stored in a calibration table of the meter, further comprising:
obtaining the fitting degree of the quadratic term fitting;
accordingly, the storing the fitting coefficient, the first calibration power and the first calibration frequency in the calibration table of the meter includes:
and under the condition that the fitting degree is larger than or equal to a preset threshold value, storing the fitting coefficient, the first calibration power and the first calibration frequency in a calibration table of the instrument in a correlation way.
4. A temperature calibration method according to claim 3, further comprising, after said obtaining the fitting degree of the quadratic term fit:
and under the condition that the fitting degree is smaller than a preset threshold value, adjusting the instrument, and continuously executing the step of setting the output power of the instrument to be the first calibration power.
5. The method of temperature calibration according to claim 1, further comprising, after said correlating said fitting coefficient, said first calibration power and said first calibration frequency into a calibration table of said meter:
When the meter is used for measuring the power of the radio frequency signal, the current output power and the current working frequency of the meter are identified;
determining at least one target calibration power associated with the current output power and at least one target calibration frequency associated with the current operating frequency;
obtaining a corresponding target fitting coefficient from the calibration table according to the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference value according to the target fitting coefficient and the current temperature;
and carrying out power deviation compensation based on the target power difference value.
6. The method of temperature calibration according to claim 5, wherein said obtaining a corresponding target fitting coefficient from the calibration table based on the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference based on the target fitting coefficient and a current temperature, comprises:
acquiring a target fitting coefficient stored in association with the target calibration power and the target calibration frequency from the calibration table under the condition that the current output power is the target calibration power and the current working frequency is the target calibration frequency;
And inputting the current target temperature into a fitting function corresponding to the target fitting coefficient for calculation, and obtaining a target power difference value.
7. The method of temperature calibration according to claim 5, wherein said obtaining a corresponding target fitting coefficient from the calibration table based on the at least one target calibration power and the at least one target calibration frequency, and determining a target power difference based on the target fitting coefficient and a current temperature, comprises:
obtaining target fitting coefficients stored in association with each target content from the calibration table under the condition that the current output power is not the target calibration power and/or the current working frequency is not the target calibration frequency, wherein the target content comprises any target calibration power and any target calibration frequency;
inputting the current target temperature into fitting functions corresponding to the target fitting coefficients to calculate, and obtaining a plurality of initial power difference values;
and calling a Lagrangian difference method to process the initial power differences to obtain a target power difference.
8. A temperature calibration device, comprising:
a first acquisition module configured to acquire a plurality of calibration powers and a plurality of calibration frequencies;
The device comprises a setting module, a control module and a control module, wherein the setting module is configured to set the output power of a meter as first calibration power and set the working frequency of the meter as first calibration frequency, wherein the first calibration power is any calibration power, and the first calibration frequency is any calibration frequency;
the acquisition module is configured to acquire the actual power of the instrument at least three temperatures respectively, and perform quadratic term fitting according to the first calibration power, the at least three temperatures and the actual powers to obtain fitting coefficients corresponding to the temperature and power difference values;
a logging module configured to correlate the fitting coefficient, the first calibration power, and the first calibration frequency into a calibration table of the meter.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the temperature calibration method of any one of claims 1 to 7 when the program is executed by the processor.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the temperature calibration method according to any one of claims 1 to 7.
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