CN112649678B - Antenna feeder measuring method and device, antenna feeder measuring device and tester - Google Patents
Antenna feeder measuring method and device, antenna feeder measuring device and tester Download PDFInfo
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Abstract
The application relates to an antenna feeder measuring method, an antenna feeder measuring device and a tester. The method comprises the following steps: acquiring a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained after the radio frequency signal reflected by the tested antenna feeder is processed; performing Fourier transformation on the reference intermediate frequency signal, and performing windowing processing on the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowed signal; performing Fourier transformation on the test intermediate frequency signal, and performing windowing treatment on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowed signal; and obtaining the antenna feeder parameters according to the reference windowing signals and the test windowing signals. The application can realize the measurement of the antenna feeder by a digital processing method, does not depend on a detection circuit of hardware to measure the antenna feeder parameters, and greatly improves the interference suppression capability in the measuring process, thereby effectively measuring the antenna feeder.
Description
Technical Field
The application relates to the technical field of antenna feeders, in particular to an antenna feeder measuring method, an antenna feeder measuring device and a tester.
Background
Because the antenna feeder system is inevitably coupled with signals of adjacent antennas, feeders or other devices, when the antenna feeder system is tested on site by using the antenna feeder tester, interference signals coupled by the antennas are often encountered to influence the test. Particularly, in the field test of the antenna feeder of the transceiver station, the antenna close to the transceiver station is in a transmitting state during inspection, so that the antenna feeder to be tested can be greatly interfered, the test effect is seriously affected, even serious misjudgment occurs, and effective measurement of the antenna feeder cannot be performed.
Disclosure of Invention
Based on the foregoing, there is a need to provide an antenna feeder measuring method, an apparatus, an antenna feeder measuring device and a tester capable of effectively measuring an antenna feeder to obtain accurate antenna feeder parameters.
In a first aspect, an embodiment of the present application provides an antenna feeder measurement method, including:
Acquiring a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained after the radio frequency signal reflected by the tested antenna feeder is processed; performing Fourier transformation on the reference intermediate frequency signal, and performing windowing processing on the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowed signal; performing Fourier transformation on the test intermediate frequency signal, and performing windowing treatment on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowed signal; and obtaining the antenna feeder parameters according to the reference windowing signals and the test windowing signals.
In one embodiment, the step of deriving the antenna feed line parameter from the reference windowed signal and the test windowed signal comprises: determining a corresponding reference vector value of the target frequency point in the reference windowing signal and a corresponding test vector value of the target frequency point in the test windowing signal; and obtaining the antenna feeder parameters according to the reference vector value and the test vector value.
In one embodiment, the antenna feed parameters include reflection coefficients; the reflection coefficient is the ratio of the magnitude of the test vector value to the magnitude of the reference vector value.
In one embodiment, the antenna feed parameters include phase differences;
obtaining an antenna feeder parameter according to the reference vector value and the test vector value, wherein the method comprises the following steps: determining a phase difference according to the test phase angle and the reference phase angle; the test phase angle is the phase angle of the test vector value, and the reference phase angle is the phase angle of the reference vector value.
In one embodiment, the step of determining the phase difference from the test phase angle and the reference phase angle comprises: when the test phase angle is smaller than the reference phase angle, confirming the difference between the test phase angle and the reference phase angle as a phase difference; in the case where the test phase angle is greater than the reference phase angle, a difference between 360 ° and the reference phase angle is calculated, and the sum of the difference and the test phase angle is confirmed as the phase difference.
In one embodiment, the window function is a rectangular window function.
In a second aspect, an embodiment of the present application provides an antenna feeder measuring apparatus, including an intermediate frequency signal acquisition module, a reference windowing signal acquisition module, a test windowing signal acquisition module, and a parameter measurement module. The intermediate frequency signal acquisition module is used for acquiring a reference intermediate frequency signal and a test intermediate frequency signal; the test intermediate frequency signal is a signal obtained after the radio frequency signal reflected by the tested antenna feeder is processed; the reference windowing signal acquisition module is used for carrying out Fourier transformation on the reference intermediate frequency signal, and carrying out windowing processing on the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowing signal; the test windowing signal acquisition module is used for carrying out Fourier transformation on the test intermediate frequency signal, and carrying out windowing processing on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowing signal; the parameter measurement module is used for obtaining antenna feeder parameters according to the reference windowing signal and the test windowing signal.
In a third aspect, an embodiment of the present application provides an antenna feeder measuring device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the antenna feeder measuring method in any of the above embodiments when executing the computer program.
In a fourth aspect, an embodiment of the present application provides an antenna feeder tester, including the antenna feeder measuring device of any one of the embodiments described above.
In one embodiment, the antenna feeder tester further comprises a test signal generation module, a mixing module, and a low pass filtering module. The test signal generation module is used for being connected with the tested antenna feeder, generating a reference radio frequency signal and a measurement radio frequency signal with the same frequency as the reference radio frequency signal, and outputting the measurement radio frequency signal to the tested antenna feeder. The frequency mixing module is connected with the test signal generating module and is used for mixing the reference radio frequency signals, outputting the reference intermediate frequency signals obtained by the mixing, mixing the measured radio frequency signals reflected by the tested antenna feeder, and outputting the test intermediate frequency signals obtained by the mixing. The low-pass filtering module is respectively connected with the frequency mixing module and the antenna feeder measuring device and is used for respectively carrying out low-pass filtering on the reference intermediate frequency signal and the test intermediate frequency signal and outputting the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal to the antenna feeder measuring device.
In one embodiment, the antenna feed tester further comprises a digital-to-analog conversion module. The digital-to-analog conversion module is connected between the frequency mixing module and the antenna feeder measuring device, is used for connecting between the low-pass filtering module and the antenna feeder measuring device, and is used for synchronously sampling the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal respectively and outputting the sampled reference intermediate frequency signal and the sampled test intermediate frequency signal to the antenna feeder measuring device.
In a fifth aspect, an embodiment of the present application provides a computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the antenna feeder measurement method of any of the embodiments described above.
According to the antenna feeder measuring method, the device and the antenna feeder tester, the reference intermediate frequency signal and the test intermediate frequency signal are obtained, fourier transformation and windowing processing are carried out on the reference intermediate frequency signal and the test intermediate frequency signal, the reference windowing signal and the test windowing signal are obtained, and the antenna feeder parameters are obtained according to the reference windowing signal and the test windowing signal, so that the antenna feeder can be measured through a digital processing method, the antenna feeder parameters such as phase difference and amplitude ratio are calculated independently of a detection circuit of hardware, extremely narrow digital noise filtering is realized, interference suppression capability in the measuring process is greatly improved, the boundary problem caused by a hardware circuit is effectively solved, and further the antenna feeder can be effectively measured, and the antenna feeder measuring method has very strong practicability in a shortwave correlation test. Meanwhile, the antenna feeder is measured by adopting a digital processing method, so that the hardware design difficulty and the cost can be reduced.
Drawings
FIG. 1 is a block diagram of a conventional antenna feed tester;
FIG. 2 is a graph showing the hardware phase result measured by AD8302 in the configuration shown in FIG. 1;
FIG. 3 is a graph showing the result of the hardware phase result in FIG. 2 after being processed by software;
FIG. 4 is a flow chart of an antenna feeder measurement method according to an embodiment of the application;
FIG. 5 is a signal diagram of a windowed reference intermediate frequency signal after FFT conversion by a rectangular window function according to an embodiment of the present application;
FIG. 6 is a signal diagram of a windowed test IF signal after FFT according to an embodiment of the present application by a rectangular window function;
FIG. 7 is a flow chart of measuring antenna feeder parameters according to an embodiment of the present application;
FIG. 8 is a vector diagram of reference vector values and test vector values in one embodiment of the application;
FIG. 9A is a first schematic diagram of calculating a phase difference according to an embodiment of the present application;
FIG. 9B is a second schematic diagram of calculating a phase difference according to an embodiment of the present application;
FIG. 10 is a graph showing the results of an all-phase calculation using the antenna feed line measurement method of the present application under the same conditions as those of FIGS. 2-3;
FIG. 11 is a block diagram of an antenna feed line measurement device in accordance with one embodiment of the present application;
FIG. 12 is a schematic block diagram of an antenna feeder tester in one embodiment of the application;
FIG. 13 is a diagram showing a filter characteristic of a low-pass filter according to an embodiment of the present application;
FIG. 14 is an effect diagram of standing wave ratio measurement by hardware filtering alone;
FIG. 15 is a graph showing the effect of standing wave ratio measured by the antenna feeder measuring method of the present application;
FIG. 16 is a block diagram of an antenna feeder tester in one embodiment of the application;
FIG. 17 is a graph showing the effect of measuring standing wave ratio in the case of 0dBm signal source interference;
FIG. 18 is a graph showing the effect of measuring standing wave ratio in the case of 5dBm signal source interference;
FIG. 19 is a graph showing the effect of measuring standing wave ratio in the case of 10dBm signal source interference;
FIG. 20 is a graph showing the effect of measuring standing wave ratio in the case of 13dBm signal source interference;
FIG. 21 shows the test effect for the frequency range 1-30 MHz with an interference power of 13dBm and a frequency of 5 MHz.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
As described in the background, the present technology has a problem that the antenna feeder cannot be effectively measured, and the inventor has found that the problem is caused by the implementation structure of the conventional antenna feeder tester is generally shown in fig. 1, and includes a test RF signal source 110, a local oscillator LO signal source 112, a first power divider 114, a second power divider 116, an attenuator 118, a directional coupler 120, a first mixer 122, a second mixer 124, a first band-pass filter 126, a second band-pass filter 128, a phase power detector 130, a first ADC132 (Analog-to-Digital Converter, an Analog-to-digital converter), a second ADC134, and a digital processor 136.
When the existing antenna feeder tester measures the measured antenna feeder, the local oscillation LO signal output by the local oscillation LO signal source 112 is split into the reference LO signal and the measured LO signal after passing through the second power divider 116. The test RF signal output from the test RF signal source 110 is split into a measurement RF signal and a reference RF signal after passing through the first power splitter 114. The reference RF signal is amplitude-adjusted by the attenuator 118 and then mixed with the reference LO signal by the first mixer 122 to obtain an intermediate frequency signal. The first band-pass filter 126 filters the intermediate frequency signal to output a reference intermediate frequency signal IF0. The directional coupler 120 connects the test RF signal to the tested antenna feeder, and separates the reflected signal of the tested antenna feeder, and the reflected signal is subjected to mixing processing and bandpass filtering (or low-pass filtering) processing in sequence, so as to obtain a test intermediate frequency signal IF1. After the hardware phase power detector 130 processes the reference intermediate frequency signal IF0 and the test intermediate frequency signal IF1, the phase difference and the amplitude ratio between the two intermediate frequency signals are converted into voltages to be output, the phase direct current voltage Vphase and the power direct current voltage Vmag output by the phase power detector 130 are input into the digital processor 136 after being sampled by the two slow ADCs, and the digital processor 136 performs conversion calculation on the received phase voltage value, so that the power ratio and the phase difference can be obtained, and parameters such as standing wave ratio, return loss and/or fault point can be further calculated.
The reference IF signal IF0 and the test IF signal IF1 are essentially co-frequency sinusoidal signals containing noise, and when the phase difference of the co-frequency signals is measured by the phase power detector 130, the methods are mainly based on a zero crossing method, a multiplier, a variable delay line method, a diode phase detector method, and the like. However, no matter which hardware method is used, signal harmonics, noise interference and the like have great influence on the measurement result, and even if a band-pass filter is added in the antenna feeder tester, the suppression of noise is limited. Meanwhile, the phase detection realized by the hardware mode can generate a phenomenon of large error at a critical value, and the measured phase is the absolute value of the phase difference, so that the real phase difference can be obtained through a software processor. Referring to fig. 2 and 3, fig. 2 and 3 are calculation results of phase test of the integrated circuit AD8302 hardware amplitude and phase detector on each measurement frequency point of the 1m feeder line through the sweep frequency signal, wherein fig. 2 is a calculation result of the hardware phase, and fig. 3 is a result of the hardware phase after software processing, and phase jitter occurs at the boundary.
In other words, the following problems exist in the conventional technology: (1) The power and phase difference obtained by adopting a hardware mode has very wide frequency response, the hardware design requirement is high, the implementation difficulty is improved, and the cost is higher when the integrated scheme is adopted for implementation. (2) Because of the nonlinearity of the phase power detector under critical conditions (approaching maximum and minimum values), effective measurement cannot be performed when measuring the power and phase under critical conditions, and the error is large. (3) If the band-pass filter is not arranged, the noise signal coupled by the tested antenna feeder does not have any inhibition capability, and the use value of field application is not realized; if the noise suppression capability is required, the intermediate frequency signal needs to pass through the band-pass filter before entering the hardware power detector, and at the moment, the band-pass filter has a larger frequency bandwidth and limited out-of-band interference suppression capability, so that in the short-wave antenna feeder line test, when a high-power signal is transmitted at an adjacent frequency, the suppression capability is insufficient, and the large-area test data is abnormal or the test curve is in a burr phenomenon. (3) The full phase difference of the test signal and the reflected signal cannot be obtained.
Based on the above, it is necessary to provide a method, a device and a tester for measuring antenna feeder, so as to greatly improve the interference suppression capability in the measuring process, effectively solve the boundary problem caused by a hardware circuit, and further effectively measure the antenna feeder, thereby having strong practicability in shortwave related test. In some embodiments, the antenna feeder test method of the application can also perform digital full-phase detection, effectively inhibit noise interference and realize full-phase measurement of-180 degrees to 180 degrees.
In one embodiment, as shown in fig. 4, an antenna feeder measurement method is provided, and this embodiment is applied to a digital processor for illustration, it will be understood that the method may also be applied to other devices with data processing functions. In this embodiment, the method includes the steps of:
step S410, obtaining a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained by processing a radio frequency signal reflected by the tested antenna feeder.
The frequency of the reference intermediate frequency signal is the same as the frequency of the test intermediate frequency signal, the reference intermediate frequency signal can be a signal obtained by down-converting the reference radio frequency signal, and the test intermediate frequency signal can be a signal obtained by down-converting the test radio frequency signal reflected by the tested antenna feeder after the test radio frequency signal is output to the tested antenna feeder. The reference radio frequency signal and the test radio frequency signal are the same frequency signal, for example, the same signal can be obtained after being split, and the frequency of the local oscillation signal adopted when the down-conversion is carried out on the 2 radio frequency signals is the same.
It should be noted that the test intermediate frequency signal and the reference intermediate frequency signal may be analog signals or digital signals, which is not particularly limited in the present application. In one embodiment, to facilitate processing by the digital processor, the test intermediate frequency signal and the reference intermediate frequency signal are both digital signals. The digital processor can receive a reference intermediate frequency signal and a test intermediate frequency signal which are input from the outside so as to realize signal acquisition; the reference radio frequency signal and the radio frequency signal reflected by the tested antenna feeder line can be obtained, the reference radio frequency signal and the reflected radio frequency signal are respectively subjected to down-conversion, and further, the down-conversion signal can be subjected to analog-to-digital conversion, so that the reference intermediate frequency signal and the test intermediate frequency signal can be obtained.
Step S420, fourier transform is carried out on the reference intermediate frequency signal, and windowing processing is carried out on the transformed reference intermediate frequency signal by adopting a window function, so that a reference windowed signal is obtained.
Specifically, after the reference intermediate frequency signal is obtained, fourier transformation is directly performed on the reference intermediate frequency signal, so as to obtain a frequency domain response signal corresponding to the reference intermediate frequency signal. The manner of fourier transform may be, but not limited to, CFT (Continuous Fourier Transform ), DFT (Discrete Fourier Transform, discrete fourier transform), FFT (Fast Fourier Transform ), and the like. In one embodiment, the reference intermediate frequency signal may be FFT transformed to increase processing efficiency.
After fourier transformation, the transformed reference intermediate frequency signal is windowed by a window function, i.e. the window function is multiplied by the transformed reference intermediate frequency signal, so that a reference windowed signal can be obtained. It can be understood that the present application may perform windowing processing by using any window function, so long as the foregoing functions may be implemented, for example, the window function may be, but not limited to, hamming window, hanning window, etc., and the window function may be determined according to factors such as frequency characteristics of the reference intermediate frequency signal, signal characteristics of the interference signal, and suppression requirements. In one embodiment, the window function may be a rectangular window function, so that the reference windowed signal accurately reflects the frequency response of the reference intermediate frequency signal within the target frequency band. The mathematical expression of the rectangular window function may be as follows:
where ω (n) is the windowed sequence number, n is the signal sample number, and M is the windowed length.
Referring to fig. 5, fig. 5 shows a signal processing procedure of windowing the reference intermediate frequency signal after FFT conversion by a rectangular window function. When the sampling point is enough and the value of M is small enough in the analog-to-digital conversion, the intermediate frequency signal can be obtained in a small bandwidth after the windowing treatment is carried out on the reference intermediate frequency signal, namely, the windowing treatment can intercept and obtain a narrowband signal, thereby improving the anti-interference performance.
And step S430, performing Fourier transformation on the test intermediate frequency signal, and performing windowing processing on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowed signal.
Specifically, after the test intermediate frequency signal is obtained, fourier transformation may be performed on the test intermediate frequency signal, and the transformed test intermediate frequency signal may be processed by using the same window function as the reference intermediate frequency signal, so as to obtain a test windowed signal. The processing procedure of the test intermediate frequency signal is similar to the processing procedure of the reference intermediate frequency signal, and the description is specifically referred to above, and will not be repeated here. In one embodiment, referring to fig. 6, fig. 6 shows a signal processing procedure of windowing the FFT-transformed test intermediate frequency signal by a rectangular window function. Thus, by applying the windowing technique to the antenna feed line measurement, interference immunity can be greatly improved.
Step S440, obtaining antenna feeder parameters according to the reference windowing signal and the test windowing signal.
The antenna feeder parameters refer to parameters that can be used to feed back the antenna feeder performance, including but not limited to reflection coefficient, phase difference, standing wave ratio, return loss, fault location, etc.
Specifically, the reference windowing signal reflects the frequency domain response of the reference intermediate frequency signal in the target frequency band, the test windowing signal reflects the frequency domain response of the test intermediate frequency signal in the target frequency band, and the antenna feeder parameters can be obtained through the reference windowing signal and the test windowing signal, so that the measurement of the antenna feeder is completed.
In one embodiment, as shown in fig. 7, the step of obtaining the antenna feeder parameter from the reference windowed signal and the test windowed signal includes:
Step S710, determining a reference vector value corresponding to the target frequency point in the reference windowing signal and a test vector value corresponding to the target frequency point in the test windowing signal;
step S720, obtaining the antenna feeder parameters according to the reference vector values and the test vector values.
Specifically, the reference windowed signal may be determined according to the DFT-transformed or FFT-transformed reference intermediate frequency signal, and the test windowed signal may be determined according to the DFT-transformed or FFT-transformed test intermediate frequency signal. Taking FFT transformation as an example, X (k) can be obtained after FFT transformation of a signal X (t) satisfying dirachta condition, where X (t) and X (k) can be as follows:
wherein a 0 is the DC component of the signal, n is the harmonic frequency, A n is the harmonic component corresponding to the nth harmonic, Is the phase angle corresponding to the nth harmonic. If the signal x (t) is sampled in nT period (nT is a sampling period), the obtained signal is obtained after DFT conversion is performed on the waveform sample with the number of N:
X(k)＝DFT[x(n)]＝Re[X(k)]+Im[X(k)]
Wherein Re [ X (k) ] is the real part of the DFT-transformed signal, im [ X (k) ] is the imaginary part of the DFT-transformed signal, and X (k) is a vector signal.
After the windowing is transformed, the corresponding reference vector value of the target frequency point in the reference windowing signal and the corresponding test vector value in the test windowing signal are respectively determined, and the antenna feeder parameter can be calculated through the reference vector value and the test vector value.
In this embodiment, the reference vector value and the test vector value are calculated, so that the processing of the digital processor can be facilitated and the processing efficiency of the digital processor can be improved.
In one embodiment, the antenna feed line parameter comprises a reflection coefficient, the reflection coefficient being the ratio of the magnitude of the test vector value to the magnitude of the reference vector value. Further, amplitude normalization can be performed on the test vector value and the reference vector value, and the reflection coefficient is determined according to the amplitude ratio of the normalized test vector value and the normalized reference vector value, so that the amplitude ratio of 2 signals can be accurately measured. Taking fig. 8 as an example for explanation, fig. 8 shows a vector diagram of a reference vector value and a test vector value in one case, and after amplitude normalization is performed on 2 vector values, an amplitude ratio of the test vector value and the reference vector value is obtained to be close to a real reflection coefficient.
In this embodiment, the reflection coefficient is measured by a full digital method, so that the hardware design difficulty and the cost can be reduced.
In one embodiment, the antenna feed parameters include phase differences. Obtaining an antenna feeder parameter according to the reference vector value and the test vector value, wherein the method comprises the following steps: the phase difference is determined from the test phase angle and the reference phase angle. The test phase angle is the phase angle of the test vector value, and the reference phase angle is the phase angle of the reference vector value.
Specifically, in acquiring the phase difference, vector rotation processing may be performed on the reference vector value and the test vector value to obtain an all-phase measurement of-180 ° to 180 °. In one embodiment, the step of determining the phase difference from the test phase angle and the reference phase angle comprises: when the test phase angle is smaller than the reference phase angle, confirming the difference between the test phase angle and the reference phase angle as a phase difference; in the case where the test phase angle is greater than the reference phase angle, a difference between 360 ° and the reference phase angle is calculated, and the sum of the difference and the test phase angle is confirmed as the phase difference. The phase difference can be calculated according to the following formula:
Wherein, For the phase difference, ω is the test phase angle and θ is the reference phase angle. In one specific example, referring to FIGS. 9A and 9B, FIG. 9A showsPhase difference calculation in case, fig. 9B showsCalculation of phase difference in the case. Referring to fig. 10, fig. 10 shows the result of performing the full phase calculation under the same conditions as those of fig. 2-3.
In the embodiment, the calculation of the phase difference is determined according to the magnitude relation between the test phase angle and the reference phase angle, so that the influence of signal randomness on the phase difference can be avoided, and the accuracy of antenna feeder measurement is improved.
According to the antenna feeder measuring method, the reference intermediate frequency signal and the test intermediate frequency signal are obtained, fourier transformation and windowing processing are carried out on the reference intermediate frequency signal and the test intermediate frequency signal, the reference windowing signal and the test windowing signal are obtained, and the antenna feeder parameters are obtained according to the reference windowing signal and the test windowing signal, so that the measurement of the antenna feeder can be realized through a digital processing method, the antenna feeder parameters such as phase difference and amplitude ratio are calculated independently of a detection circuit of hardware, extremely narrow digital noise filtering is realized, interference suppression capability in the measuring process is greatly improved, the boundary problem caused by a hardware circuit is effectively solved, and further the antenna feeder can be effectively measured, and the antenna feeder measuring method has very strong practicability in short wave correlation testing. Meanwhile, the antenna feeder is measured by adopting a digital processing method, so that the hardware design difficulty and the cost can be reduced.
It should be understood that, although the steps in the flowcharts of fig. 4-10 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in FIGS. 4-10 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, as shown in fig. 11, there is provided an antenna feeder measuring apparatus comprising: an intermediate frequency signal acquisition module 810, a reference windowed signal acquisition module 812, a test windowed signal acquisition module 814, and a parameter measurement module 816, wherein:
An intermediate frequency signal acquisition module 810 for acquiring a reference intermediate frequency signal and a test intermediate frequency signal; the test intermediate frequency signal is a signal obtained after the radio frequency signal reflected by the tested antenna feeder is processed;
A reference windowed signal obtaining module 812, configured to perform fourier transform on the reference intermediate frequency signal, and perform windowing processing on the transformed reference intermediate frequency signal by using a window function, so as to obtain a reference windowed signal;
the test windowing signal obtaining module 814 is configured to perform fourier transform on the test intermediate frequency signal, and perform windowing processing on the test intermediate frequency signal after the transform by using a window function to obtain a test windowing signal;
A parameter measurement module 816 for obtaining the antenna feeder parameters from the reference windowed signal and the test windowed signal.
In one embodiment, parameter measurement module 816 includes a vector value determination unit and a measurement unit. The vector value determining unit is used for determining a reference vector value corresponding to the target frequency point in the reference windowing signal and a test vector value corresponding to the target frequency point in the test windowing signal. The measuring unit is used for obtaining the antenna feeder parameters according to the reference vector value and the test vector value.
In one embodiment, the antenna feed parameters include a reflection coefficient; the reflection coefficient is the ratio of the magnitude of the test vector value to the magnitude of the reference vector value.
In one embodiment, the antenna feed parameters include phase differences. The measuring unit is used for determining a phase difference according to the test phase angle and the reference phase angle; the test phase angle is the phase angle of the test vector value, and the reference phase angle is the phase angle of the reference vector value.
In one embodiment, the measurement unit includes a first phase difference confirmation unit and a second phase difference confirmation unit. The first phase difference confirmation unit is used for confirming the difference between the test phase angle and the reference phase angle as the phase difference when the test phase angle is smaller than the reference phase angle. The second phase difference confirmation unit is used for calculating a difference value between 360 degrees and the reference phase angle and confirming the sum of the difference value and the test phase angle as the phase difference when the test phase angle is larger than the reference phase angle.
In one embodiment, the window function is a rectangular window function.
For specific limitations of the antenna feeder measuring device, reference may be made to the above limitations of the antenna feeder measuring method, and no further description is given here. The various modules in the antenna feed line measurement device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, there is provided an antenna feed line measurement device comprising a memory and a processor, the memory having stored therein a computer program which when executed by the processor performs the steps of:
Acquiring a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained after the radio frequency signal reflected by the tested antenna feeder is processed;
Performing Fourier transformation on the reference intermediate frequency signal, and performing windowing processing on the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowed signal;
performing Fourier transformation on the test intermediate frequency signal, and performing windowing treatment on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowed signal;
And obtaining the antenna feeder parameters according to the reference windowing signals and the test windowing signals.
In one embodiment, the processor when executing the computer program further performs the steps of: determining a corresponding reference vector value of the target frequency point in the reference windowing signal and a corresponding test vector value of the target frequency point in the test windowing signal; and obtaining the antenna feeder parameters according to the reference vector value and the test vector value.
In one embodiment, the antenna feed parameters include phase differences. The processor when executing the computer program also implements the steps of: determining a phase difference according to the test phase angle and the reference phase angle; the test phase angle is the phase angle of the test vector value, and the reference phase angle is the phase angle of the reference vector value.
In one embodiment, the processor when executing the computer program further performs the steps of: when the test phase angle is smaller than the reference phase angle, confirming the difference between the test phase angle and the reference phase angle as a phase difference; in the case where the test phase angle is greater than the reference phase angle, a difference between 360 ° and the reference phase angle is calculated, and the sum of the difference and the test phase angle is confirmed as the phase difference.
In one embodiment, an antenna feeder tester is provided that includes the antenna feeder measurement device 826 described above. In one embodiment, as shown in fig. 12, the antenna feeder tester further includes a test signal generation module 820, a mixing module 822, and a low pass filtering module 824, which are connected in sequence. The test signal generation module 820 is used to connect to the antenna feed under test, and the low pass filter module 824 is connected to the antenna feed measurement device 826.
The test signal generating module 820 is configured to generate a reference rf signal and a measurement rf signal having the same frequency as the reference rf signal, and output the measurement rf signal to the antenna feeder under test. The mixing module 822 is configured to mix the reference rf signal, and output a reference intermediate frequency signal obtained by mixing; and the device is also used for mixing the measured radio frequency signals reflected by the measured antenna feeder and outputting the test intermediate frequency signals obtained by mixing. The low-pass filtering module 824 is configured to perform low-pass filtering on the reference oscillating frequency signal and the test intermediate frequency signal, and output the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal to the antenna feeder line measuring device 826.
Specifically, the mixing module 822 can perform spectrum shifting on the reference rf signal and the reflected test rf signal, and obtain a reference intermediate frequency signal and a test intermediate frequency signal. In one embodiment, the mixing module 822 may mix the test frequency point f with the local oscillator of f+187.5khz to obtain the low intermediate frequency signal of 187.5KHz, so that the reference radio frequency signal and the test radio frequency signal may be converted into the low intermediate frequency signal for subsequent processing, and the requirement of the sampling device is reduced, and the cost of the tester is reduced.
The filtering parameters of the low pass filtering module 824 may be determined based on the filtering requirements, the interference signal frequency band, etc., and in one embodiment, the low pass filtering module 824 may be implemented by a 4-order low pass filter with a-3 dB bandwidth of 256K, and the low pass filtering characteristic is shown in fig. 13. If the interference is only resisted by the low-pass filter method, but not by the antenna feeder measuring method described in the foregoing embodiments, when the test signal power is 3dBm, the basic characteristics of the low-pass filter and the noise suppression characteristics thereof are shown in table 1 after theoretical calculation, and Pn is the noise power in table 1.
Table 1 low pass filter characteristics and noise interference suppression effects
If only a low-pass filter is adopted, assuming that the noise frequency point fn=10.0 MHz, the test frequency is f, the local oscillation frequency flo=f+187.5khz, the interference power is 13dBm, and the measurement error is greater than 10% and is in an interfered state, the interference frequency suppression bandwidth of the low-pass filter can be exemplified as shown in table 2.
Table 2 illustrates an example of interference frequency rejection bandwidth using only a low pass filter
It can be inferred that if only the antenna feeder scheme of the hardware low-pass filter is adopted, the anti-interference suppression capability of the hardware is theoretically as shown in table 3:
TABLE 3 noise interference suppression capability Using Low pass filters
| Suppressing bandwidth | Inhibit level |
| ±300KHz | 0dBm |
| ±330KHz | 5dBm |
| ±390KHz | 10dBm |
| ±450KHz | 13dBm |
If 13dBm signal source interference is added, the effect of the hardware filtering to measure standing wave ratio can be as shown in fig. 14. It can be seen that hardware-only filtering is not capable of achieving a sufficiently small filter bandwidth and is not ideal for noise suppression.
Therefore, the antenna feeder tester directly eliminates the circuit of the hardware detection part, performs Fourier transformation on the intermediate frequency signal, and windows and intercepts the narrow-band signal, and can effectively and accurately measure the antenna feeder parameters through the cooperation of low-pass filtering and digital measurement. Referring to fig. 15, fig. 15 shows a standing wave ratio effect diagram measured under the condition of 13dBm signal source interference after adding a digital filtering algorithm.
In one embodiment, the antenna feed tester further comprises a digital-to-analog conversion module. The digital-to-analog conversion module is connected between the low-pass filtering module 824 and the antenna feeder line measuring device 826, and is configured to synchronously sample the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal, and output the sampled reference intermediate frequency signal and the sampled test intermediate frequency signal to the antenna feeder line measuring device 826. To achieve accurate sampling, the digital-to-analog conversion module may have a higher sampling rate.
To facilitate an understanding of the aspects of the present application, the antenna feeder tester is described below by way of a specific example. As shown in fig. 16, the antenna feed line tester includes a test sweep signal source 910, a local oscillator sweep signal source 912, a first power divider 914, a second power divider 916, an attenuator 918, a directional coupler 920, a first mixer 922, a second mixer 924, a first low pass filter 926, a second low pass filter 928, a first ADC930, a second ADC932, and a DSP processor 934.DSP processor 934 is used to perform the steps of the antenna feed line measurement method in any of the embodiments described above.
The first power divider 914 is connected to the test frequency-sweeping signal source 910, and divides the test frequency-sweeping signal output by the test frequency-sweeping signal source 910 into a reference radio frequency signal and a test radio frequency signal, where the reference radio frequency signal sequentially passes through the attenuator 918, the first mixer 922 and the first low-pass filter 926, so as to adjust the signal level and shift the frequency spectrum of the reference radio frequency signal, and obtain a reference intermediate frequency signal. The test radio frequency signal passes through the directional coupler 920, and is incident to the tested antenna feeder through the test port to obtain a reflected signal, the reflected signal is separated by the directional coupler 920, and the test radio frequency signal is processed by the second mixer 924 and the second low-pass filter 928, so that the test intermediate frequency signal IF1 can be obtained. The amplitude ratio and phase difference information between the reference radio frequency signal and the reflected test radio frequency signal are the same as those between the reference intermediate frequency signal IF0 and the test intermediate frequency signal IF1 obtained after hardware level adjustment and frequency spectrum shifting. The calculation can thus be performed by referring to the intermediate frequency signal IF0 and the test intermediate frequency signal IF1. After sampling by two paths of synchronous ADC, the signals are input to a digital signal processor to finish measurement.
When the number of sampling points is 1024 points, the sampling frequency is 1.024MHz, the frequency interval is 1KHz, the window width is 5, after the intermediate frequency signal is subjected to hardware filtering, the intermediate frequency signal is subjected to FFT narrowband filtering treatment, and the 13dBm noise suppression bandwidth can be narrowed to within +/-5 KHz.
In order to verify the anti-interference capability of the antenna feeder tester, the output power of a signal source is adjusted to 0dBm, 5dBm, 10dBm and 13dBm, the output frequency is set to 5MHz, the single-frequency point noise interference source is set to 3.25 MHz-6.25 MHz, and the standing wave ratio measuring effect obtained by each test point can be shown as figures 17-20.
The measuring frequency range is set to be 1-30 MHz, the adding frequency is 5MHz, the power is 13dBm interference source, and the test effect of the comparison test can be shown in figure 21.
In the antenna feeder tester, the hardware design difficulty is effectively reduced, and the windowed FFT technology is applied to the antenna feeder, so that the full phase and power values of the reference signal and the measurement signal can be accurately calculated, and the boundary problem caused by hardware amplitude and phase detection is effectively solved. Meanwhile, the narrow-band filtering effect can be effectively obtained by the windowing technology, compared with the hardware detection scheme, the anti-interference performance of the antenna feeder tester can be greatly improved,
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
Acquiring a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained after the radio frequency signal reflected by the tested antenna feeder is processed;
Performing Fourier transformation on the reference intermediate frequency signal, and performing windowing processing on the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowed signal;
performing Fourier transformation on the test intermediate frequency signal, and performing windowing treatment on the transformed test intermediate frequency signal by adopting a window function to obtain a test windowed signal;
And obtaining the antenna feeder parameters according to the reference windowing signals and the test windowing signals.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a corresponding reference vector value of the target frequency point in the reference windowing signal and a corresponding test vector value of the target frequency point in the test windowing signal; and obtaining the antenna feeder parameters according to the reference vector value and the test vector value.
In one embodiment, the antenna feed parameters include phase differences. The computer program when executed by the processor also performs the steps of: determining a phase difference according to the test phase angle and the reference phase angle; the test phase angle is the phase angle of the test vector value, and the reference phase angle is the phase angle of the reference vector value.
In one embodiment, the computer program when executed by the processor further performs the steps of: when the test phase angle is smaller than the reference phase angle, confirming the difference between the test phase angle and the reference phase angle as a phase difference; in the case where the test phase angle is greater than the reference phase angle, a difference between 360 ° and the reference phase angle is calculated, and the sum of the difference and the test phase angle is confirmed as the phase difference.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (6)
1. An antenna feed tester, comprising: the device comprises an antenna feeder measuring device, a test signal generating module, a frequency mixing module, a low-pass filtering module and a digital-to-analog conversion module;
The antenna feeder measuring device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the following steps when executing the computer program: acquiring a reference intermediate frequency signal and a test intermediate frequency signal with the same frequency as the reference intermediate frequency signal; the test intermediate frequency signal is obtained by processing a radio frequency signal reflected by a tested antenna feeder; performing Fourier transformation on the reference intermediate frequency signal, and windowing the transformed reference intermediate frequency signal by adopting a window function to obtain a reference windowed signal; performing Fourier transformation on the test intermediate frequency signal, and windowing the transformed test intermediate frequency signal by adopting the window function to obtain a test windowed signal; obtaining antenna feeder parameters according to the reference windowing signal and the test windowing signal;
The test signal generation module is used for connecting a tested antenna feeder, generating a reference radio frequency signal and a measurement radio frequency signal with the same frequency as the reference radio frequency signal, and outputting the measurement radio frequency signal to the tested antenna feeder;
The frequency mixing module is connected with the test signal generating module and is used for mixing the reference radio frequency signals, outputting the reference intermediate frequency signals obtained by the mixing, mixing the measured radio frequency signals reflected by the tested antenna feeder, and outputting the test intermediate frequency signals obtained by the mixing;
the low-pass filtering module is respectively connected with the frequency mixing module and the antenna feeder measuring device and is used for respectively carrying out low-pass filtering on the reference intermediate frequency signal and the test intermediate frequency signal and outputting the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal to the antenna feeder measuring device;
The digital-to-analog conversion module is connected between the low-pass filtering module and the antenna feeder measuring device and is used for synchronously sampling the filtered reference intermediate frequency signal and the filtered test intermediate frequency signal respectively and outputting the sampled reference intermediate frequency signal and the sampled test intermediate frequency signal to the antenna feeder measuring device.
2. The antenna feed tester of claim 1 wherein the antenna feed measurement device is further configured to perform the steps of:
Determining a reference vector value corresponding to a target frequency point in the reference windowing signal and a test vector value corresponding to the target frequency point in the test windowing signal;
and obtaining the antenna feeder parameter according to the reference vector value and the test vector value.
3. The antenna feeder tester of claim 2, wherein the antenna feeder parameters include a reflection coefficient; the reflection coefficient is a ratio of an amplitude of the test vector value to an amplitude of the reference vector value.
4. The antenna feeder tester of claim 2, wherein the antenna feeder parameters include phase differences; the antenna feed line measurement device is further configured to perform the steps of:
Determining the phase difference from a test phase angle and a reference phase angle; wherein the test phase angle is the phase angle of the test vector value and the reference phase angle is the phase angle of the reference vector value.
5. The antenna feeder tester of claim 4, wherein the antenna feeder measurement device is further configured to perform the steps of:
determining a difference between the test phase angle and the reference phase angle as the phase difference if the test phase angle is less than the reference phase angle;
in the case where the test phase angle is greater than the reference phase angle, a difference between 360 ° and the reference phase angle is calculated, and a sum of the difference and the test phase angle is confirmed as the phase difference.
6. The antenna feed tester of any one of claims 1 to 5 wherein the window function is a rectangular window function.
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| CN114720794B (en) * | 2022-02-14 | 2023-06-06 | 中国电子科技集团公司第二十九研究所 | Electronic equipment antenna feeder unit testing device and method based on space radiation |
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