CN117310603A - Method and system for passive wireless positioning of airport equipment group materials - Google Patents
Method and system for passive wireless positioning of airport equipment group materials Download PDFInfo
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- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
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Abstract
The invention belongs to the field of airport material positioning by utilizing radio waves, and aims to solve the operation and maintenance problems caused by the fact that an active wireless positioning scheme is required to work with a battery and the problems of short reading distance, low positioning accuracy, low response speed and the like when a passive wireless positioning scheme is utilized in the working process when the current airport equipment material positioning is performed, and provides a passive wireless positioning method and system for airport equipment group materials, which mainly comprise the following steps: the passive wireless positioning terminal labels with small volume, simple structure and no need of batteries are arranged on the materials of all the equipment in the airport, the microwave transmitting base station is established in the airport to drive the passive wireless positioning terminal labels in the whole airport range to work, the signals with the uniqueness determined by the frequency and sent by the positioning terminal labels are collected through the microwave receiving base stations distributed at all the positions of the airport, and the signals are processed through the fusion calculation center to output group material target position information, so that the accurate positioning of the material equipment in the airport can be realized, the resource utilization rate is improved, and the potential safety hazard is reduced.
Description
Technical Field
The invention relates to the field of airport material positioning by utilizing radio waves, in particular to a passive wireless positioning method and system for airport equipment group materials.
Background
Airport equipment is complex in materials, and a large number of transportation facilities, traction rods, cargoes and materials are scattered at various positions of an airport. Because airplanes in airports frequently come and go and the flow of people is large, equipment materials need to be placed in a designated area after the equipment materials are used so as to avoid obstructing the normal operation of the airports. At present, the scheduling management of equipment materials basically depends on a mode of reporting to a center after the personnel in charge of each area patrols, the mode is time-consuming and labor-consuming, has low efficiency, is difficult to grasp the position information of the equipment materials in time to realize rapid scheduling, and still has the hidden trouble of blocking paths of the equipment materials.
Besides manual work, there is a scheme of positioning by adding a positioning device on equipment materials, but airport equipment materials are frequently moved and cannot be connected to a fixed power line, so a wireless transmission mode is generally adopted.
The active wireless positioning mode is like GPS or big dipper location, has realized airport material equipment automatic positioning management's function, has solved the not enough of manual scheduling to a certain extent, but positioner carries battery power, and battery life is limited needs frequent change, and because airport equipment material is numerous, and battery failure time is different and makes unable unified change, and fortune dimension management cost rises.
Meanwhile, the method has the hidden trouble of positioning failure caused by accidental faults of the battery and exhausted electric quantity. The passive wireless positioning mode avoids the problem caused by a battery, and an airport material equipment positioning scheme combining RFID (radio frequency identification) technology or visual identification technology exists at present. However, the RFID technology has a limited reading range, and the data transmission distance is too short; visual recognition technology is sensitive to illumination conditions and object shielding, positioning accuracy is relatively low, and response speed is low due to the fact that a large amount of image data are processed and analyzed in real time. The method is difficult to popularize and implement in the case of large airport area and large equipment and materials needing to be positioned.
Disclosure of Invention
The invention aims to provide a passive wireless positioning method and system for airport equipment group materials, which aim to solve the operation and maintenance problems caused by the fact that an active wireless positioning scheme is required to work with a battery when the airport equipment group materials are positioned at present and the problems that the current passive wireless positioning scheme is short in reading distance, low in positioning accuracy, low in response speed and the like when the passive wireless positioning scheme is used in work.
The invention solves the technical problems and adopts the following technical scheme:
in one aspect, the invention provides a passive wireless positioning method for airport equipment group materials, comprising the following steps:
s1, mounting a passive wireless positioning terminal tag on material equipment to be managed;
s2, sending out an excitation signal through a microwave transmitting base station;
s3, after receiving the excitation signal, the passive wireless positioning terminal tag generates a positioning microwave signal, transmits the positioning microwave signal into space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal and the excitation signal are the same;
s4, each microwave receiving base station receives the positioning microwave signals in the action range and gathers the positioning microwave signals to a fusion calculation center;
s5, frequency sorting is carried out by the fusion calculation center, positioning microwave signals transmitted by the same passive wireless positioning terminal tag are matched, whether the positioning microwave signals are received by more than a first number of microwave receiving base stations or not is judged, if yes, wideband pulse signal pulse compression processing is carried out on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag and received by all the microwave receiving base stations by the fusion calculation center, accurate time delay corresponding to the positioning microwave signals received by each microwave receiving base station is respectively obtained, and otherwise, step S2 is returned;
s6, based on the positions and time delays of microwave receiving base stations receiving positioning microwave signals transmitted by the same passive wireless positioning terminal tag, acquiring a plurality of groups of hyperbolas corresponding to the number of the microwave receiving base stations according to a hyperbola positioning principle, wherein the intersection points of the plurality of groups of hyperbolas are the positions of the material equipment to be managed where the passive wireless positioning terminal tag is located.
As further optimization, in step S1, when the passive wireless positioning terminal tag is mounted on the to-be-managed material equipment, the passive wireless positioning terminal tag is mounted in a bolt fixing or structural adhesive bonding fixing mode according to the type and characteristics of the to-be-managed material equipment.
As a further optimization, in step S2, the excitation signal sent by the microwave transmitting base station is a high-bandwidth pulse signal, which is used for passively exciting the passive wireless positioning terminal tag.
As further optimization, in step S3, after the passive wireless positioning terminal tag receives the excitation signal, it generates positioning microwave signals, different passive wireless positioning terminal tags are modulated by different resonant frequencies, and each positioning microwave signal emitted by each passive wireless positioning terminal tag has frequency uniqueness, and is used for classifying and identifying group materials, and eliminating positioning ambiguity.
As further optimization, after the passive wireless positioning terminal tag receives excitation signals, the passive wireless positioning terminal tag responds to drive the internal resonator to work immediately to generate resonance frequency signals, mixes the excitation signals with the resonance frequency signals and generates positioning microwave signals with unique identity characteristics determined by the frequency.
As a further optimization, in step S5, the first number is three.
On the other hand, the invention also provides a system for passive wireless positioning of airport equipment materials, which is applied to the method for passive wireless positioning of airport equipment group materials, and comprises the following steps:
the microwave transmitting base station is used for transmitting an excitation signal;
the passive wireless positioning terminal tag is used for being installed on the material equipment to be managed and receiving an excitation signal, generating a positioning microwave signal after receiving the excitation signal, transmitting the positioning microwave signal into a space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal are the same as those of the excitation signal;
the microwave receiving base stations with the number more than the first number are used for receiving the positioning microwave signals in the action range and summarizing the positioning microwave signals to the fusion calculation center;
the fusion calculation center is used for carrying out frequency sorting, matching the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, judging whether the positioning microwave signals are received by more than a first number of microwave receiving base stations, if yes, carrying out broadband pulse signal pulse compression processing on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag received by all the microwave receiving base stations by the fusion calculation center, respectively obtaining accurate time delay corresponding to the positioning microwave signals received by each microwave receiving base station, and if not, controlling the microwave transmitting base stations to transmit excitation signals again;
and the system is also used for acquiring a plurality of groups of hyperbolas corresponding to the number of the microwave receiving base stations according to the hyperbola positioning principle based on the positions and time delays of the microwave receiving base stations receiving the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, and the intersection points of the plurality of groups of hyperbolas are the positions of the passive wireless positioning terminal tag and the material equipment to be managed.
The beneficial effects of the invention are as follows: the passive wireless positioning method and system for the airport equipment group materials are applied to the positioning and inventory of the airport equipment, the passive wireless positioning terminal labels are arranged on the various pieces of equipment, so that the accurate positioning of the various pieces of airport equipment can be realized, the device does not need to be powered, the device is driven by specific microwaves, the application range is wide, the device is suitable for the scenes of large area, more equipment materials and inconvenient power supply of the airport, and by the application of the device, a large amount of airport equipment can be accurately positioned for effective management, and meanwhile, the potential safety hazard of channel blockage caused by improper equipment material management is avoided.
Drawings
FIG. 1 is a flow chart of a passive wireless positioning method for airport equipment group materials in embodiment 1 of the invention;
FIG. 2 is a schematic diagram of hardware connection in embodiment 3 of the present invention;
FIG. 3 is a diagram showing the relationship between the components when a plurality of airport supplies are positioned in embodiment 3 of the present invention;
FIG. 4 is an echo in embodiment 3 of the present inventionA time delay diagram to three microwave receiving base stations;
fig. 5 is a hyperbolic positioning schematic in embodiment 3 of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The embodiment provides a passive wireless positioning method for airport equipment group materials, the flow chart of which is shown in fig. 1, wherein the method comprises the following steps:
s1, mounting a passive wireless positioning terminal tag on material equipment to be managed;
here, when the passive wireless positioning terminal tag is installed on the material equipment to be managed, the passive wireless positioning terminal tag is installed in a fixing mode such as bolt fixing or structural adhesive sticking according to the type and the characteristics of the material equipment to be managed.
S2, sending out an excitation signal through a microwave transmitting base station;
the microwave transmitting base station can be arranged at a tower or other higher position of an airport, and transmits a high-bandwidth pulse signal to the whole management area, so that the passive wireless positioning terminal tag is excited passively.
S3, after receiving the excitation signal, the passive wireless positioning terminal tag generates a positioning microwave signal, transmits the positioning microwave signal into space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal and the excitation signal are the same;
in step S3, after the passive wireless positioning terminal tag receives the excitation signal, a positioning microwave signal is generated, different passive wireless positioning terminal tags are modulated by different resonant frequencies, each positioning microwave signal emitted by each passive wireless positioning terminal tag has frequency uniqueness and can be used for classifying and identifying group substances, positioning ambiguity is eliminated, and after the passive wireless positioning terminal tag receives the excitation signal, the passive wireless positioning terminal tag can immediately respond to drive an internal resonator to work to generate a resonant frequency signal, and mix the excitation signal with the resonant frequency signal to generate a positioning microwave signal with unique identity characteristics determined by frequency.
S4, each microwave receiving base station receives the positioning microwave signals in the action range and gathers the positioning microwave signals to a fusion calculation center;
s5, frequency sorting is carried out by the fusion calculation center, positioning microwave signals transmitted by the same passive wireless positioning terminal tag are matched, whether the positioning microwave signals are received by more than a first number of microwave receiving base stations or not is judged, if yes, wideband pulse signal pulse compression processing is carried out on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag and received by all the microwave receiving base stations by the fusion calculation center, accurate time delay corresponding to the positioning microwave signals received by each microwave receiving base station is respectively obtained, and otherwise, step S2 is returned;
in this embodiment, the microwave receiving base stations are uniformly installed in each area of the airport at a certain interval, and the microwave receiving base stations work independently, and each microwave base station can collect the received positioning signals to the fusion calculation center.
In addition, in order to realize accurate positioning of the passive wireless positioning terminal tag by using the hyperbola, the number of the first number is three, and of course, the number of the microwave receiving base stations can be properly increased according to the types and the number of the airport material equipment to be managed.
S6, based on the positions and time delays of microwave receiving base stations receiving positioning microwave signals transmitted by the same passive wireless positioning terminal tag, acquiring hyperbolas corresponding to the number of the microwave receiving base stations according to a hyperbola positioning principle, wherein the intersection points of a plurality of groups of hyperbolas are the positions of the material equipment to be managed where the passive wireless positioning terminal tag is located.
In this embodiment, based on the problem of difficulty in positioning the materials of the current airport equipment, the operation and maintenance problems caused by the operation of the current active wireless positioning scheme (such as GPS and beidou positioning) with the battery and the shortages of the current passive wireless positioning scheme (such as RFID and visual identification technology) that the working reading distance is short, the positioning accuracy is low, the response speed is slow, etc. can be solved.
The passive wireless positioning terminal labels which are small in size, simple in structure and free of batteries are arranged on materials of all equipment in an airport, a microwave transmitting base station is established in the airport to drive the passive wireless positioning terminal labels in the whole airport range to work, signals with frequency uniqueness sent by all the passive wireless positioning terminal labels are collected through microwave receiving base stations distributed at all the positions of the airport, and the passive wireless positioning terminal labels can be used for classifying and identifying group materials and eliminating positioning ambiguity. The information of the target point positions is output through the processing of the fusion calculation center, so that the accurate distinction and positioning of airport material equipment can be realized, the resource utilization rate can be improved, and the potential safety hazard is reduced.
Therefore, in the method of the embodiment, the passive wireless positioning terminal tag can separate the received excitation signal and the transmitted positioning microwave signal, the received excitation signal and the transmitted positioning microwave signal are not interfered with each other, and immediate response is achieved without time delay, so that positioning measurement and calculation are more accurate. And moreover, the passive wireless positioning terminal tag is driven by specific passive microwaves, so that the battery dependence can be thoroughly eliminated, and the passive wireless positioning terminal tag is modulated by resonance frequency, so that the accurate distinction of different material equipment can be realized.
Example 2
This embodiment is based on embodiment 1, and the method steps thereof may include the following steps when applied specifically:
step 1: the microwave transmitting base station sends out excitation signalThe signal adopts a linear frequency modulation high-bandwidth pulse signal with certain characteristics, so that the action range is large, and the positioning is more accurate.
（，/>For exciting signal carrier wave>For frequency modulation slope
Step 2: passive wireless positioning terminal tag receiptAfter stress, the internal resonator can be driven to work in real time to generate a resonant frequency signal, and +.>Mixing the signals at the resonance frequency to generate a positioning microwave signal which is orthogonal to the frequency of the excitation signal, has the same signal time width, bandwidth and repetition period>Wherein:
（，/>in order to generate carrier waves of frequency offset after being modulated by a passive wireless positioning terminal tag, excitation signals and positioning microwave signals can be effectively distinguished, interference is reduced, T is wide in signal time and the range is 0-10 us).
Step 3: the passive wireless positioning terminal tag transmits positioning microwave signals into spaceThe time of transmitting the positioning microwave signal is the reference time +.>。
Step 4: and each microwave receiving base station receives the positioning microwave signals in the action range and gathers the positioning microwave signals to a fusion calculation center.
Step 5: according to the characteristic that the passive wireless positioning tag is modulated by the resonance frequency, positioning microwave signals generated by different tags have uniqueness, and the method can be used for classifying and identifying group substances and eliminating positioning ambiguity. Frequency sorting is carried out by fusing the calculation center, and the transmitted positioning microwave signals of the same passive wireless positioning terminal tag A are matched. Judging->Whether received by 3 or more receiving base stations. If not, returning to the step 1 for repeating; if so, the positioning microwave signals received by the microwave receiving base stations T1, T2 and T3 are respectively expressed as +.>，/>，/>The receiving time delay is +.>、/>、/>（，/>，/>，/>、/>、/>The distances from the passive wireless positioning terminal tag A to the three base stations are respectively shown, and C is the speed of light).
Step 6: positioning microwaves received by three microwave receiving base stations through fusion calculation center，/>，Performing pulse compression processing on the linear frequency modulation signal to obtain accurate delay difference +.>、/>And->（/>Is thatAnd->Delay difference (I)>Is->And->Delay difference (I)>Is->And->Time delay difference).
The matched filter function of the positioning microwave signal processing pulse compression processing is expressed as:；
the positioning microwave signal processing pulse process is expressed as:
step 7: according to the hyperbola positioning principle, three positioning hyperbolas (the locus of points with constant distance difference from two fixed points (focuses) is a hyperbola) are obtained, and the intersection point is the position of the material equipment where the passive wireless positioning terminal tag A is positioned, and the position information is output.
Example 3
On the basis of embodiment 1 and embodiment 2, this embodiment provides a passive wireless positioning system for airport equipment materials, including:
the microwave transmitting base station is used for transmitting an excitation signal;
the passive wireless positioning terminal tag is used for being installed on the material equipment to be managed and receiving an excitation signal, generating a positioning microwave signal after receiving the excitation signal, transmitting the positioning microwave signal into a space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal are the same as those of the excitation signal;
the microwave receiving base stations with the number more than the first number are used for receiving the positioning microwave signals in the action range and summarizing the positioning microwave signals to the fusion calculation center;
the fusion calculation center is used for carrying out frequency sorting, matching the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, judging whether the positioning microwave signals are received by more than a first number of microwave receiving base stations, if yes, carrying out broadband pulse signal pulse compression processing on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag received by all the microwave receiving base stations by the fusion calculation center, respectively obtaining accurate time delay corresponding to the positioning microwave signals received by each microwave receiving base station, and if not, controlling the microwave transmitting base stations to transmit excitation signals again;
and the system is also used for acquiring a plurality of groups of hyperbolas corresponding to the number of the microwave receiving base stations according to the hyperbola positioning principle based on the positions and time delays of the microwave receiving base stations receiving the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, and the intersection points of the plurality of groups of hyperbolas are the positions of the passive wireless positioning terminal tag and the material equipment to be managed.
Referring to fig. 2, the hardware of each connection in this embodiment includes a microwave transmitting base station, a passive wireless positioning terminal tag, microwave receiving base stations T1, T2, T3 (receiving base stations within the radiation range of any three positioning terminal tags in the airport), and a material facility to be managedStandby (transport facilities, drawbars, cargo, materials, etc.), excitation signalsIn this embodiment, as a range, the excitation signal FR emitted by the microwave emitting base station R can be received by all the to-be-managed material devices with passive wireless positioning terminal tags, where the frequencies of each passive wireless positioning terminal tag have uniqueness, and the frequencies of the passive wireless positioning terminal tags corresponding to each to-be-managed material device are different, in this embodiment, for example, one to-be-managed material device is a, another to-be-managed material device is B, the passive wireless positioning terminal tag a corresponding to the to-be-managed material device a, the passive wireless positioning terminal tag B corresponding to the to-be-managed material device is B, the frequencies corresponding to the two passive wireless positioning terminal tags are different, the positioning microwave signal of the passive wireless positioning terminal tag a is FA, and the positioning signal reference time is->The positioning microwave signal of the passive wireless positioning terminal tag B is FB, and the reference time of the positioning signal is +.>The positioning microwave signals FA and FB can be received by T1, T2 and T3, and the time for receiving the positioning microwave signals FA, T1, T2 and T3 is +.>、/>、/>For the positioning microwave signal FB, the times of reception of T1, T2, T3 are respectively +.>、/>、/>After the fusion calculation center is subjected to frequency sorting and hyperbola positioning, the position information of the two different-frequency material equipment to be managed can be output. Similarly, for other material equipment to be managed in the action range, corresponding position information can be obtained through the principle.
When a plurality of airport material equipment is positioned, the relation diagram among the components is shown in figure 3.
In specific application, the microwave transmitting base station transmits excitation signalsDriving internal devices and circuits of passive wireless positioning terminal tag, and enabling passive wireless positioning terminal tag to respond without delay, emit and excite signals +.>The frequency is orthogonal, the signal time is wide, the bandwidth and the repetition period are the same, and the microwave signal is positioned. Each passive wireless positioning terminal tag is modulated by different resonant frequencies, and the transmitted positioning microwave signals have different frequencies and frequency uniqueness, so that the passive wireless positioning terminal tag can be used for classifying and identifying group substances and eliminating positioning ambiguity. The microwave receiving base stations receive the positioning microwave signals in the respective ranges and gather the positioning microwave signals to the fusion processing center, the fusion processing center performs frequency sorting according to different frequencies, and the positioning microwave signals (at least received by three microwave receiving base stations) of the same passive wireless positioning terminal tag are matched for calculation.
Referring to fig. 4, let the passive wireless positioning terminal tag a transmit a positioning return microwave signal FA, the transmission reference time is:three base stations T1, T2, T3 receiving the signal receive the positioning microwave signal +.>The time of (2) is respectively: />、/>、/>The method comprises the steps of carrying out a first treatment on the surface of the The passive wireless positioning terminal tag B transmits a positioning return microwave signal FB, and the transmission reference time is as follows: />Three base stations T1, T2, T3 receiving the signal receive the positioning microwave signal FB at the following times: />、/>、/>. Respectively carrying out broadband pulse signal pulse compression processing on positioning microwaves FA received by three base stations to obtain mutual time delay +.>、/>And(time delay is a fixed value), and wideband pulse signal pulse compression processing is respectively carried out on positioning microwaves FB received by three base stations, so as to obtain mutual time delay +.>、/>And->(delay is constant).
Referring to fig. 5, according to the hyperbolic definition: the absolute difference between the distances from two points on the plane is equal toThe set of points of non-zero definite value, smaller than the two-point distance, is called hyperbola, according to、/>And->The value can obtain three positioning hyperbolas, and the intersection point of the three positioning hyperbolas is the position of the material equipment where the passive wireless positioning terminal tag A is positioned.
Therefore, after the system of the embodiment is adopted, the dependence of a battery can be eliminated when airport materials are positioned, and the system is suitable for various material equipment, wherein a passive wireless positioning terminal tag is free of maintenance without a battery, small in size, easy to install, larger in acting distance, strong in instantaneity and high in accuracy, can replace the original manual visual management and manual recording modes, and overcomes the defects of the existing positioning modes such as GPS, beidou, RFID and visual identification. In addition, when the scheme of the embodiment is utilized for positioning, the equipment materials can be distinguished, because the passive wireless positioning terminal tag is modulated by the resonant frequency, the passive wireless positioning terminal tag emits positioning microwave signals orthogonal to the frequency of the excitation signal after being stressed, the time width, the bandwidth and the repetition period of the signals are the same, the positioning microwave signals emitted by different passive wireless positioning terminal tags are different in frequency, and the passive wireless positioning terminal tag has frequency uniqueness, can be used for classifying and identifying group materials, and eliminates positioning ambiguity, so that the airport material equipment is distinguished. Finally, the embodiment can realize the accurate positioning of airport materials, and the passive wireless positioning terminal tag can respond immediately because of different frequencies and mutual noninterference of receiving and transmitting signals, thus the accurate positioning can be realized after the subsequent fusion processing is combined.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The passive wireless positioning method for the airport equipment group supplies is characterized by comprising the following steps:
s1, mounting a passive wireless positioning terminal tag on material equipment to be managed;
s2, sending out an excitation signal through a microwave transmitting base station;
s3, after receiving the excitation signal, the passive wireless positioning terminal tag generates a positioning microwave signal, transmits the positioning microwave signal into space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal and the excitation signal are the same;
s4, each microwave receiving base station receives the positioning microwave signals in the action range and gathers the positioning microwave signals to a fusion calculation center;
s5, carrying out frequency sorting by the fusion calculation center according to the frequency of the positioning microwave signals, matching the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, judging whether the positioning microwave signals are received by more than a first number of microwave receiving base stations, if yes, carrying out broadband pulse signal pulse compression processing on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag and received by all the microwave receiving base stations by the fusion calculation center, respectively obtaining accurate time delays corresponding to the positioning microwave signals received by each microwave receiving base station, otherwise, returning to the step S2;
s6, based on the positions and time delays of microwave receiving base stations receiving positioning microwave signals transmitted by the same passive wireless positioning terminal tag, acquiring a plurality of groups of hyperbolas corresponding to the number of the microwave receiving base stations according to a hyperbola positioning principle, wherein the intersection points of the plurality of groups of hyperbolas are the positions of the material equipment to be managed where the passive wireless positioning terminal tag is located.
2. The method for passive wireless positioning of airport equipment groups according to claim 1, wherein in step S1, when the passive wireless positioning terminal tag is mounted on the equipment to be managed, the passive wireless positioning terminal tag is mounted by adopting a bolt fixing or structural adhesive bonding fixing mode according to the type and characteristics of the equipment to be managed.
3. The method for passive wireless positioning of airport equipment groups according to claim 1, wherein in step S2, the excitation signal sent by the microwave transmitting base station is a high bandwidth pulse signal, so as to make the passive wireless positioning terminal tag excited passively.
4. The method for passive wireless positioning of airport equipment group materials according to claim 1, wherein in step S3, after the passive wireless positioning terminal tag receives the excitation signal, it generates positioning microwave signals, different passive wireless positioning terminal tags are modulated by different resonance frequencies, and each positioning microwave signal transmitted by each passive wireless positioning terminal tag has frequency uniqueness, and is used for classifying and identifying group materials, and eliminating positioning ambiguity.
5. The method for passive wireless positioning of airport equipment groups according to claim 4, wherein the passive wireless positioning terminal tag generates a resonant frequency signal in response to the driving of the internal resonator after receiving the excitation signal, and mixes the excitation signal with the resonant frequency signal to generate a positioning microwave signal having a unique identity determined by the frequency.
6. The method for passive wireless location of airport equipment groups according to claim 1, wherein in step S5, said first number is three.
7. A system for passive wireless location of airport equipment group materials, applied to a method for passive wireless location of airport equipment group materials according to any of claims 1-6, comprising:
the microwave transmitting base station is used for transmitting an excitation signal;
the passive wireless positioning terminal tag is used for being installed on the material equipment to be managed and receiving an excitation signal, generating a positioning microwave signal after receiving the excitation signal, transmitting the positioning microwave signal into a space, wherein the time for transmitting the positioning microwave signal is the reference time, the positioning microwave signal is orthogonal with the frequency of the excitation signal so as to eliminate ground clutter interference generated by the excitation signal, and the time width, the bandwidth and the repetition period of the positioning microwave signal are the same as those of the excitation signal;
the microwave receiving base stations with the number more than the first number are used for receiving the positioning microwave signals in the action range and summarizing the positioning microwave signals to the fusion calculation center;
the fusion calculation center is used for carrying out frequency sorting, matching the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, judging whether the positioning microwave signals are received by more than a first number of microwave receiving base stations, if yes, carrying out broadband pulse signal pulse compression processing on the positioning microwave signals transmitted by the same passive wireless positioning terminal tag received by all the microwave receiving base stations by the fusion calculation center, respectively obtaining accurate time delay corresponding to the positioning microwave signals received by each microwave receiving base station, and if not, controlling the microwave transmitting base stations to transmit excitation signals again;
and the system is also used for acquiring a plurality of groups of hyperbolas corresponding to the number of the microwave receiving base stations according to the hyperbola positioning principle based on the positions and time delays of the microwave receiving base stations receiving the positioning microwave signals transmitted by the same passive wireless positioning terminal tag, and the intersection points of the plurality of groups of hyperbolas are the positions of the passive wireless positioning terminal tag and the material equipment to be managed.
Priority Applications (1)
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