Receiving and transmitting beam dual-polarization gain consistency calibration system and method

Abstract

The invention discloses a transmitting and receiving beam dual-polarization gain consistency calibration system and method. The system comprises a terminal device and a calibration device mounted on an unmanned aerial vehicle. The calibration device comprises a signal generation module, a signal receiving module, a circularly polarized antenna, a control module and a communication module. The terminal equipment sends a first control instruction to the calibration device, the circularly polarized antenna radiates a horizontally polarized electromagnetic wave signal and a vertically polarized electromagnetic wave signal, and the signals are received and processed by the tested radar to obtain a received beam dual-polarization gain difference; the terminal equipment sends a second control instruction to the tested radar, the tested radar radiates a horizontal polarization electromagnetic wave signal and a vertical polarization electromagnetic wave signal, and the signals are received and processed by the calibration device to obtain a transmitting beam dual-polarization gain difference; and the terminal equipment calculates a calibration value according to the receiving beam dual-polarization gain difference and the transmitting beam dual-polarization gain difference. According to the invention, the problem that radar transmit-receive beam dual-polarization gain difference measurement cannot be realized in an external field is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar calibration, and in particular relates to a dual-polarization gain consistency calibration system and method for a dual-polarization phased array weather radar. Background Art

[0002] Dual-polarization phased array weather radar is a precision testing device that can be used to test the polarization characteristics of weather echoes, including co-correlation coefficient, differential reflectivity, differential propagation phase shift, differential propagation phase shift rate, etc. The dual-polarization characteristics of weather echoes are an important reference for weather phenomenon analysis, especially for hail, snowfall and other weather phenomena. However, the premise is that the dual polarization quantity of the dual-polarization phased array weather radar used for detection must be very accurate.

[0003] There are many factors that determine the accuracy of dual polarization detection of dual polarization phased array weather radar, and these factors are ultimately reflected in the consistency of horizontal polarization and vertical polarization of radar transceiver beams (i.e., transmitting beams and receiving beams), including beam pointing consistency, beam width consistency, gain consistency, etc. of horizontal polarization and vertical polarization. The gain consistency of the transceiver beams in horizontal polarization and vertical polarization directly affects the differential reflectivity detection accuracy of the dual polarization phased array weather radar. For the calibration of differential reflectivity index (or gain consistency), the commonly used method is to use a professional microwave darkroom to measure the directional diagrams of the transmitting beam and receiving beam of the dual polarization phased array weather radar respectively, analyze its gain values ​​in horizontal polarization and vertical polarization, and then obtain the gain difference. This test method is complicated and can only be carried out in a specific site. Once the radar is set up in the field, it cannot be tested. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-polarization gain consistency calibration system and method for transmitting and receiving beams, so as to solve the problem that the traditional gain difference test method can only be carried out in a specific venue and cannot be tested in the outdoor field.

[0005] The present invention solves the above technical problems through the following technical solutions: a transceiver beam dual-polarization gain consistency calibration system, comprising an unmanned aerial vehicle, a remote controller, a terminal device and a calibration device mounted on the unmanned aerial vehicle; the calibration device comprises a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, the control module is connected to the signal generating module, the signal receiving module and the communication module; the terminal device is connected to the calibration device and the radar under test in communication; The remote controller is used to control the UAV carrying the calibration device to fly to a predetermined spatial position; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; The terminal device is used to send a first control instruction to the calibration device to receive the dual-polarization gain difference of the receiving beam fed back by the measured radar; send a second control instruction to the measured radar to receive the dual-polarization gain difference of the transmitting beam fed back by the calibration device; calculate a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and send the calibration value to the measured radar; wherein the dual-polarization gain difference of the receiving beam is calculated by the measured radar according to the received first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal; The signal generating module is used to simultaneously generate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal under the action of the first control instruction; The circularly polarized antenna is used to radiate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal; and receive a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal radiated by the radar under test under the action of a second control instruction; The signal receiving module is used to sample the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna, respectively, to obtain a second horizontally polarized sampling signal and a second vertically polarized sampling signal; The control module is used to calculate the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and send the transmit beam dual-polarization gain difference to the terminal device.

[0006] Further, the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test, comprising: The elevation angles of the circularly polarized antenna and the antenna of the radar under test are adjusted to make the circularly polarized antenna parallel to the antenna of the radar under test, so as to align the main beam of the circularly polarized antenna with the main beam of the antenna of the radar under test.

[0007] Further, the control module is used to calculate the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, specifically including: Performing power detection on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain a second horizontal polarization power and a second vertical polarization power; A difference is calculated between the second horizontal polarization power and the second vertical polarization power to obtain the transmit beam dual-polarization gain difference.

[0008] Furthermore, the signal receiving module uses fast envelope detection to sample the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna respectively.

[0009] Based on the same concept, the present invention provides a method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam, comprising: Before calibration, a drone equipped with a calibration device is controlled by a remote controller to fly to a predetermined spatial position; wherein the calibration device comprises a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, wherein the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; During calibration, the terminal device sends a first control instruction to the calibration device, and the signal generating module generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal under the action of the first control instruction, and radiates them externally through the circularly polarized antenna; The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal; calculates a receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, and sends the receiving beam dual-polarization gain difference to a terminal device; After receiving the receiving beam dual-polarization gain difference, the terminal device sends a second control instruction to the radar under test; The radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal under the action of the second control instruction; The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar, and samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal by the signal receiving module; The control module calculates a transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device; The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

[0010] Further, the radar under test calculates a receiving beam dual-polarization gain difference according to the first horizontal polarization sampling signal and the first vertical polarization sampling signal, including: Performing power detection on the first horizontal polarization sampling signal and the first vertical polarization sampling signal respectively to obtain a first horizontal polarization power and a first vertical polarization power; A difference is calculated between the first horizontal polarization power and the first vertical polarization power to obtain the receive beam dual-polarization gain difference.

[0011] Based on the same concept, the present invention provides a method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam, comprising: Before calibration, a drone equipped with a calibration device is controlled by a remote controller to fly to a predetermined spatial position; wherein the calibration device comprises a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, wherein the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; During calibration, the terminal device sends a second control instruction to the radar under test; The radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal under the action of the second control instruction; The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar, and samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal by the signal receiving module; The control module calculates a transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device; After receiving the dual-polarization gain difference of the transmitting beam, the terminal device sends a first control instruction to the calibration device, and the signal generating module generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal at the same time under the action of the first control instruction, and radiates them externally through the circularly polarized antenna; The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal; calculates a receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, and sends the receiving beam dual-polarization gain difference to a terminal device; The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

[0012] Beneficial Effects Compared with the prior art, the advantages of the present invention are: The present invention realizes the measurement of the dual-polarization gain difference of the transmitting beam and the dual-polarization gain difference of the receiving beam by mutually transmitting or receiving dual-polarization signals between the radar and the calibration device carried by the unmanned aerial vehicle, reduces the measurement complexity of the dual-polarization gain difference of the radar transmitting and receiving beams, improves the measurement efficiency and measurement accuracy of the dual-polarization gain difference of the radar transmitting and receiving beams, and solves the problem that the dual-polarization gain difference of the radar transmitting and receiving beams cannot be measured in the field.

[0013] The present invention only needs to control the UAV to make the calibration device enter the predetermined spatial position, so as to realize the automatic measurement of the dual-polarization gain difference of the transceiver beam, and then realize the automatic calibration of the consistency of the dual-polarization gain of the radar transceiver beam, and then realize the differential reflectivity calibration of the radar, which greatly reduces the requirements of the calibration work on the operator and the calibration error caused by the individual differences of the operators, simplifies the work difficulty and workload of the operators, and has great significance for the operation and maintenance of the dual-polarization phased array weather radar. During the calibration process, there is no need to remove the radar module, connect cables, carry instruments and other operations.

[0014] The calibration device of the present invention uses a circularly polarized antenna as a radiating antenna. No matter whether the antenna of the radar under test is horizontally polarized or vertically polarized, it can be fully aligned with the circularly polarized antenna of the calibration device in terms of polarization. There is no need to perform polarization alignment between the antenna of the calibration device and the antenna of the radar under test, thus overcoming the problem of difficulty in polarization alignment between the antenna of the calibration device and the antenna of the radar under test. At the same time, since the beam of the circularly polarized antenna is very wide, it is easier to achieve alignment between the calibration device and the radar under test in terms of beam pointing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a structural block diagram of a calibration device in an embodiment of the present invention; Figure 2 is a schematic diagram of aligning the main beam of the calibration device with the main beam of the radar under test in an embodiment of the present invention; Figure 3 It is a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal simultaneously radiated externally by the calibration device in the embodiment of the present invention; Figure 4 is a timing diagram of continuous emission of a calibration device in an embodiment of the present invention; Figure 5is a second horizontally polarized electromagnetic wave signal radiated externally by the radar under test in an embodiment of the present invention; Figure 6 is a second vertically polarized electromagnetic wave signal radiated externally by the radar under test in an embodiment of the present invention; Figure 7 is a timing diagram of fast envelope detection in an embodiment of the present invention; Figure 8 : is a directivity coefficient test diagram of a circularly polarized antenna in an embodiment of the present invention; wherein X represents the horizontal angle, Y represents the elevation angle, and Z represents the gain; Fig. 9 It is a flow chart of the method for calibrating the consistency of dual-polarization gain of transceiver beams in embodiment 2 of the present invention; Fig.10 It is a flow chart of the dual-polarization gain consistency calibration method for the transmitting and receiving beams in Example 3 of the present invention. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0019] Example 1 A dual-polarization gain consistency calibration system for transmitting and receiving beams provided in an embodiment of the present invention includes a drone, a remote controller, a terminal device, and a calibration device mounted on the drone; Figure 1 As shown, the calibration device includes a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module. The signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; the terminal device is connected to the calibration device and the radar under test.

[0020] The remote controller is used to control a UAV equipped with a calibration device to fly to a predetermined spatial position by wireless communication. In order to get rid of the dependence of the traditional signal source calibration method on test towers, high-rise buildings, etc., and to carry out the calibration of phased array weather radars under various terrain conditions, the present invention uses a UAV equipped with a calibration device to fly to a predetermined spatial position. The operator controls the remote controller to make the UAV equipped with the calibration device fly to the predetermined spatial position; alternatively, the terminal device calculates the spatial position of the calibration device according to demand, generates a flight trajectory instruction according to the spatial position of the calibration device, and controls the UAV to fly to the predetermined spatial position through the remote controller. This method is flexible to operate, the flight trajectory is controllable, the flight attitude is stable, it can hover in the air for a long time, and the position accuracy during hovering is high.

[0021] The radar under test and the drone both have their own positioning modules. According to the positions of the radar under test and the drone, it can be determined whether the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. At the predetermined spatial position, the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. Only when the far-field conditions are met can the electromagnetic wave signal be fully formed in the direction of the main beam of the directional antenna and the nominal antenna gain be obtained. In this embodiment, the far-field conditions are: R ≥ (2D 2 ) / λ (1) Where R represents the distance between the calibration device and the radar under test, D represents the effective aperture of the radar antenna under test, and λ represents the wavelength of the transmitted signal of the radar under test. Usually, the distance between the calibration device and the radar under test is from several hundred meters to several kilometers, which meets the far-field condition.

[0022] On the basis of satisfying the far-field condition, the main beam of the antenna of the radar under test must be ensured to be coaxial with the main beam radiation direction of the circularly polarized antenna of the calibration device and the axis is aligned, which is the theoretical calibration radiation link model. In a specific embodiment of the present invention, the main beam of the calibration device is aligned with the main beam of the radar under test by adjusting the elevation angle of the circularly polarized antenna of the calibration device and the antenna of the radar under test. Figure 2 As shown, the antenna elevation angle α of the radar under test is known, and the circular polarization antenna elevation angle β of the calibration device is adjusted to make the circular polarization antenna elevation angle β of the calibration device equal to the antenna elevation angle α of the radar under test, thereby making the circular polarization antenna of the calibration device parallel to the antenna of the radar under test, that is, the main beam of the calibration device is aligned with the main beam of the radar under test. The circular polarization antenna elevation angle of the calibration device can be adjusted manually, and before calibration, the circular polarization antenna elevation angle of the calibration device is adjusted to be consistent with the antenna elevation angle of the radar under test.

[0023] The terminal device is used to send a first control instruction to the calibration device, so that the calibration device is in the transmitting mode under the first control instruction. The calibration device radiates electromagnetic wave signals of horizontal polarization and vertical polarization at the same time. At this time, the radar under test is in the receiving mode, receives the electromagnetic wave signal radiated by the calibration device, and processes the received electromagnetic wave signal to obtain the receiving beam dual-polarization gain difference; the radar under test sends the receiving beam dual-polarization gain difference to the terminal device, and the terminal device receives the receiving beam dual-polarization gain difference fed back by the radar under test. A horizontally polarized electromagnetic wave signal refers to an electromagnetic wave signal oscillating in the horizontal direction, and the signal propagates in the horizontal direction; a vertically polarized electromagnetic wave signal refers to an electromagnetic wave signal oscillating in the vertical direction, and the signal propagates in the vertical direction.

[0024] The terminal device is used to send a second control instruction to the radar under test, so that the radar under test is in the transmitting mode under the second control instruction. The radar under test radiates horizontally polarized and vertically polarized electromagnetic wave signals to the outside. At this time, the calibration device is in the receiving mode, receives the electromagnetic wave signals radiated by the radar under test, and processes the received electromagnetic wave signals to obtain the dual-polarization gain difference of the transmitting beam; the calibration device sends the dual-polarization gain difference of the transmitting beam to the terminal device, and the terminal device receives the dual-polarization gain difference of the transmitting beam fed back by the calibration device.

[0025] The terminal device is used to calculate the calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and send the calibration value to the radar under test, so that the radar under test can perform the consistency calibration of the dual-polarization gain of the transmitting and receiving beams according to the calibration value, thereby realizing the differential reflectivity calibration of the radar.

[0026] The calibration device includes a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module. The control module is connected to the terminal device through the communication module. When the control module receives a first control instruction sent by the terminal device through the communication module, the calibration device is in a transmitting mode. The control module controls the signal generating module to simultaneously generate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal according to the first control instruction. Since the calibration device uses a circularly polarized antenna, the calibration device can simultaneously radiate the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal. Figure 3 As shown. The radar under test is in receiving mode and does not radiate signals externally. The calibration device radiates a dual-polarized continuous signal externally. Regardless of whether the radar under test receives the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal simultaneously or in different time periods, the radar under test can always receive these two polarized electromagnetic wave signals. Figure 4As shown, the calibration device transmits a continuous signal. Since the radar under test uses time-sharing transmission and reception when working, the calibration device and the radar under test cannot be of the same source, that is, it is impossible to achieve strict synchronization of the signals of the calibration device and the radar under test in terms of timing. Therefore, the calibration device needs to continuously and without intervals transmit electromagnetic wave signals (i.e., continuous signals). In this way, even if the radar under test is switching between transmission and reception during operation, it can always receive the electromagnetic wave signals radiated by the calibration device, forming interference echoes on the radar under test. At this time, the differential reflectivity of the interference echo reflects the gain difference of the receiving beam of the radar under test. Therefore, the radar under test samples, detects the power, and calculates the difference of the received first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal, and can obtain the dual-polarization gain difference of the receiving beam of the radar under test.

[0027] When the radar under test receives the second control instruction sent by the terminal device through the network, the radar under test is in the transmitting mode, the calibration device is in the receiving mode, and the radar under test radiates the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal in turn under the second control instruction. Figure 5 and Figure 6 As shown. The circularly polarized antenna of the calibration device receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar twice; the signal receiving module of the calibration device samples the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna respectively to obtain the second horizontally polarized sampling signal and the second vertically polarized sampling signal; the control module of the calibration device performs power detection on the second horizontally polarized sampling signal and the second vertically polarized sampling signal respectively to obtain the second horizontally polarized power and the second vertically polarized power, and then performs difference calculation on the second horizontally polarized power and the second vertically polarized power to obtain the dual-polarized gain difference of the transmitting beam.

[0028] like Figure 7 As shown, the signal receiving module uses high-speed envelope detection for sampling when receiving the second horizontal polarization electromagnetic wave signal and the second vertical polarization electromagnetic wave signal, because the radar under test transmits a pulse signal, that is, the signal is discontinuous, and the calibration device and the radar under test cannot be of the same source, that is, it is impossible to achieve strict timing synchronization of the calibration device and the radar under test, and the calibration device cannot achieve synchronous reception. Therefore, fast envelope detection must be used, and the detection speed is higher than the repetition period of the radar transmission pulse, so that there are always some moments when the peak value of the radar transmission pulse can be detected. Through a large number of data samples, the maximum value of the detection signal is selected from them, that is, the power detection of the radar pulse signal is realized.

[0029] In a specific embodiment of the present invention, the circularly polarized antenna is designed using a microstrip patch antenna unit, and the antenna gain does not need to be too high. The gain of a single microstrip patch antenna unit can reach 6dB, and the gains of the horizontal polarization and the vertical polarization can be guaranteed to be completely consistent. Figure 8 The directivity coefficient test diagram of the circularly polarized antenna is shown in Figure 8 It can be seen that the linear polarization gain of the antenna is 12.87dB, and its effective signal radiation surface is approximately a sphere. The 3dB beam width in each polarization direction is about 40°, and the gain in each polarization direction is basically the same. The antenna of the radar under test is usually a single polarization antenna or a dual polarization antenna. Regardless of whether the antenna of the radar under test is horizontally polarized or vertically polarized, it can be fully aligned with the circularly polarized antenna of the calibration device in terms of polarization. Alignment in beam pointing is also easier to achieve because the beam of the circularly polarized antenna is very wide.

[0030] Example 2 like Fig. 9 As shown, a method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam provided in an embodiment of the present invention includes the following steps: Step 1: Use the remote control to control the drone equipped with the calibration device to fly to the predetermined spatial position.

[0031] In order to get rid of the dependence of traditional signal source calibration methods on test towers, high-rise buildings, etc., and to carry out calibration of phased array weather radars under various terrain conditions, the present invention uses a drone equipped with a calibration device to fly to a predetermined spatial position. The operator controls the remote control to make the drone equipped with the calibration device fly to the predetermined spatial position; or, the terminal device calculates the spatial position of the calibration device according to demand, generates a flight trajectory instruction according to the spatial position of the calibration device, and controls the drone to fly to the predetermined spatial position through the remote control. This method is flexible to operate, the flight trajectory is controllable, the flight attitude is stable, it can hover in the air for a long time, and the position accuracy during hovering is high.

[0032] The radar and drone under test both have their own positioning modules. Based on the positions of the radar and drone under test, it can be determined whether the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. At the predetermined spatial position, the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. Only when the far-field conditions are met can the electromagnetic wave signal be fully formed in the direction of the main beam of the directional antenna and the nominal antenna gain be obtained.

[0033] On the basis of satisfying the far-field condition, the main beam of the antenna of the radar under test must be ensured to be coaxial with the main beam radiation direction of the circularly polarized antenna of the calibration device and the axis is aligned, which is the theoretical calibration radiation link model. In a specific embodiment of the present invention, the main beam of the calibration device is aligned with the main beam of the radar under test by adjusting the elevation angle of the circularly polarized antenna of the calibration device and the antenna of the radar under test. Figure 2 As shown, the antenna elevation angle α of the radar under test is known, and the circular polarization antenna elevation angle β of the calibration device is adjusted to make the circular polarization antenna elevation angle β of the calibration device equal to the antenna elevation angle α of the radar under test, thereby making the circular polarization antenna of the calibration device parallel to the antenna of the radar under test, that is, the main beam of the calibration device is aligned with the main beam of the radar under test. The circular polarization antenna elevation angle of the calibration device can be adjusted manually, and before calibration, the circular polarization antenna elevation angle of the calibration device is adjusted to be consistent with the antenna elevation angle of the radar under test.

[0034] Step 2: The terminal device sends a first control instruction to the calibration device.

[0035] Step 3: Under the action of the first control instruction, the signal generating module simultaneously generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal, and radiates them externally through a circularly polarized antenna.

[0036] The calibration device includes a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, and the control module is connected to the terminal device through the communication module. When the control module receives a first control instruction sent by the terminal device through the communication module, the calibration device is in a transmitting mode, and the control module controls the signal generating module to simultaneously generate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal according to the first control instruction. Since the calibration device adopts a circularly polarized antenna, the calibration device can simultaneously radiate the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal.

[0037] Step 4: The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated outward by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal.

[0038] The radar under test is in receiving mode and does not radiate signals. The calibration device radiates a dual-polarized continuous signal. Regardless of whether the radar under test receives the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal simultaneously or in different time periods, the radar under test can always receive these two polarized electromagnetic wave signals. Figure 4As shown, the calibration device transmits a continuous signal. Since the radar under test uses time-sharing transmission and reception when working, the calibration device and the radar under test cannot be of the same source, that is, it is impossible to achieve strict timing synchronization of the signals of the calibration device and the radar under test. Therefore, the calibration device is required to continuously and uninterruptedly transmit electromagnetic wave signals (that is, continuous signals). In this way, even if the radar under test is switching between transmission and reception during operation, it can always receive the electromagnetic wave signals radiated by the calibration device, forming interference echoes on the radar under test.

[0039] Step 5: Calculate the receive beam dual-polarization gain difference according to the first horizontal polarization sampling signal and the first vertical polarization sampling signal, and send the receive beam dual-polarization gain difference to the terminal device.

[0040] The radar under test uses its own data processing link to receive, sample and detect the power of the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal, and calculates the receiving beam dual-polarization gain difference according to the power detection result. In a specific embodiment of the present invention, the radar under test calculates the receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, including: Power detection is performed on the first horizontal polarization sampling signal and the first vertical polarization sampling signal respectively to obtain a first horizontal polarization power and a first vertical polarization power; and a difference calculation is performed on the first horizontal polarization power and the first vertical polarization power to obtain a receiving beam dual-polarization gain difference.

[0041] Step 6: After receiving the dual-polarization gain difference of the receiving beam, the terminal device sends a second control instruction to the radar under test.

[0042] Step 7: Under the action of the second control instruction, the radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal.

[0043] When the radar under test receives the second control instruction sent by the terminal device through the network, the radar under test is in the transmitting mode, the calibration device is in the receiving mode, and the radar under test radiates the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal in turn under the second control instruction. Figure 5 and Figure 6 shown.

[0044] Step 8: The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the radar under test, and the signal receiving module samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal.

[0045] The circularly polarized antenna of the calibration device receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar twice; the signal receiving module of the calibration device samples the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna respectively to obtain a second horizontally polarized sampling signal and a second vertically polarized sampling signal.

[0046] Step 9: The control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device.

[0047] In a specific implementation of the present invention, the control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, including: Power detection is performed on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain the second horizontal polarization power and the second vertical polarization power; and the difference between the second horizontal polarization power and the second vertical polarization power is calculated to obtain the dual-polarization gain difference of the transmission beam.

[0048] Step 10: The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

[0049] The calibration value is equal to the sum of the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam.

[0050] The present invention uses a far-field calibration device to measure the dual-polarization transmission beam dual-polarization gain difference of the dual-polarization phased array weather radar, and then uses the data processing link of the dual-polarization phased array weather radar itself to obtain the dual-polarization receiving beam dual-polarization gain difference, and calculates the sum of the receiving beam dual-polarization gain difference and the transmitting beam dual-polarization gain difference to obtain the dual-polarization receiving and transmitting beam dual-polarization gain difference of the dual-polarization phased array weather radar, that is, the differential reflectivity calibration of the dual-polarization phased array weather radar is realized. The calibration device can detect the power of the electromagnetic wave signal radiated by the radar into space in horizontal polarization and vertical polarization, and the difference in the power of the electromagnetic wave signal in horizontal polarization and vertical polarization reflects the dual-polarization gain difference of the transmitting beam of the radar transmitting system; similarly, the measured radar can detect the dual-polarization gain difference of the receiving beam of the radar receiving system, and the sum of the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam is the intensity difference of the radar dual-polarization detection, that is, the differential reflectivity calibration value of the radar system. Since the drone has real-time location information, it can easily adjust its position in space to achieve differential reflectivity calibration of multiple beams of the dual-polarization phased array weather radar. This is more reliable and more operational than the metal ball calibration method.

[0051] Example 3 like Fig.10As shown, a method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam provided in an embodiment of the present invention includes the following steps: Step 1: Use the remote control to control the drone equipped with the calibration device to fly to the predetermined spatial position.

[0052] In order to get rid of the dependence of traditional signal source calibration methods on test towers, high-rise buildings, etc., and to carry out calibration of phased array weather radars under various terrain conditions, the present invention uses a drone equipped with a calibration device to fly to a predetermined spatial position. The operator controls the remote control to make the drone equipped with the calibration device fly to the predetermined spatial position; or, the terminal device calculates the spatial position of the calibration device according to demand, generates a flight trajectory instruction according to the spatial position of the calibration device, and controls the drone to fly to the predetermined spatial position through the remote control. This method is flexible to operate, the flight trajectory is controllable, the flight attitude is stable, it can hover in the air for a long time, and the position accuracy during hovering is high.

[0053] The radar and drone under test both have their own positioning modules. Based on the positions of the radar and drone under test, it can be determined whether the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. At the predetermined spatial position, the circularly polarized antenna of the calibration device and the antenna of the radar under test meet the far-field conditions. Only when the far-field conditions are met can the electromagnetic wave signal be fully formed in the direction of the main beam of the directional antenna and the nominal antenna gain be obtained.

[0054] On the basis of satisfying the far-field condition, the main beam of the antenna of the radar under test must be ensured to be coaxial with the main beam radiation direction of the circularly polarized antenna of the calibration device and the axis is aligned, which is the theoretical calibration radiation link model. In a specific embodiment of the present invention, the main beam of the calibration device is aligned with the main beam of the radar under test by adjusting the elevation angle of the circularly polarized antenna of the calibration device and the antenna of the radar under test. Figure 2 As shown, the antenna elevation angle α of the radar under test is known, and the circular polarization antenna elevation angle β of the calibration device is adjusted to make the circular polarization antenna elevation angle β of the calibration device equal to the antenna elevation angle α of the radar under test, thereby making the circular polarization antenna of the calibration device parallel to the antenna of the radar under test, that is, the main beam of the calibration device is aligned with the main beam of the radar under test. The circular polarization antenna elevation angle of the calibration device can be adjusted manually, and before calibration, the circular polarization antenna elevation angle of the calibration device is adjusted to be consistent with the antenna elevation angle of the radar under test.

[0055] Step 2: The terminal device sends a second control instruction to the radar under test.

[0056] Step 3: Under the action of the second control instruction, the radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal.

[0057] When the radar under test receives the second control instruction sent by the terminal device through the network, the radar under test is in the transmitting mode, the calibration device is in the receiving mode, and the radar under test radiates the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal in turn under the second control instruction. Figure 5 and Figure 6 shown.

[0058] Step 4: The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the radar under test, and the signal receiving module samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal.

[0059] The calibration device includes a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, and the control module is connected to the terminal device through the communication module. The circularly polarized antenna of the calibration device receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar twice; the signal receiving module of the calibration device samples the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna respectively to obtain the second horizontally polarized sampling signal and the second vertically polarized sampling signal.

[0060] Step 5: The control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device.

[0061] In a specific implementation of the present invention, the control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, including: Power detection is performed on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain the second horizontal polarization power and the second vertical polarization power; and the difference between the second horizontal polarization power and the second vertical polarization power is calculated to obtain the dual-polarization gain difference of the transmission beam.

[0062] Step 6: After receiving the dual-polarization gain difference of the transmitting beam, the terminal device sends a first control instruction to the calibration device.

[0063] Step 7: Under the action of the first control instruction, the signal generating module simultaneously generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal, and radiates them externally through the circularly polarized antenna.

[0064] When the control module receives the first control instruction sent by the terminal device through the communication module, the calibration device is in the transmitting mode, and the control module controls the signal generating module to simultaneously generate the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal according to the first control instruction. Since the calibration device adopts a circularly polarized antenna, the calibration device can simultaneously radiate the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal.

[0065] Step 8: The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated outward by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal.

[0066] The radar under test is in receiving mode and does not radiate signals. The calibration device radiates a dual-polarized continuous signal. Regardless of whether the radar under test receives the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal simultaneously or in different time periods, the radar under test can always receive these two polarized electromagnetic wave signals. Figure 4 As shown, the calibration device transmits a continuous signal. Since the radar under test uses time-sharing transmission and reception when working, the calibration device and the radar under test cannot be of the same source, that is, it is impossible to achieve strict timing synchronization of the signals of the calibration device and the radar under test. Therefore, the calibration device is required to continuously and uninterruptedly transmit electromagnetic wave signals (that is, continuous signals). In this way, even if the radar under test is switching between transmission and reception during operation, it can always receive the electromagnetic wave signals radiated by the calibration device, forming interference echoes on the radar under test.

[0067] Step 9: Calculate the receive beam dual-polarization gain difference according to the first horizontal polarization sampling signal and the first vertical polarization sampling signal, and send the receive beam dual-polarization gain difference to the terminal device.

[0068] The radar under test uses its own data processing link to receive, sample and detect the power of the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal, and calculates the receiving beam dual-polarization gain difference according to the power detection result. In a specific embodiment of the present invention, the radar under test calculates the receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, including: Power detection is performed on the first horizontal polarization sampling signal and the first vertical polarization sampling signal respectively to obtain a first horizontal polarization power and a first vertical polarization power; and a difference calculation is performed on the first horizontal polarization power and the first vertical polarization power to obtain a receiving beam dual-polarization gain difference.

[0069] Step 10: The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

[0070] The calibration value is equal to the sum of the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam.

[0071] What is disclosed above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A transceiver beam dual-polarization gain consistency calibration system, comprising a drone, a remote controller, a terminal device, and a calibration device mounted on the drone; Features: The calibration device includes a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, wherein the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; the terminal device is connected to the calibration device and the radar under test in communication; The remote controller is used to control the UAV carrying the calibration device to fly to a predetermined spatial position; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; The terminal device is used to send a first control instruction to the calibration device to receive the dual-polarization gain difference of the receiving beam fed back by the measured radar; send a second control instruction to the measured radar to receive the dual-polarization gain difference of the transmitting beam fed back by the calibration device; calculate a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and send the calibration value to the measured radar; wherein the dual-polarization gain difference of the receiving beam is calculated by the measured radar according to the received first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal; The signal generating module is used to simultaneously generate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal under the action of the first control instruction; The circularly polarized antenna is used to radiate a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal; and receive a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal radiated by the radar under test under the action of a second control instruction; The signal receiving module is used to sample the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna, respectively, to obtain a second horizontally polarized sampling signal and a second vertically polarized sampling signal; The control module is used to calculate the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and send the transmit beam dual-polarization gain difference to the terminal device.

2. The dual-polarization gain consistency calibration system for transmitting and receiving beams according to claim 1, It is characterized in that The control module is used to calculate the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, specifically including: Performing power detection on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain a second horizontal polarization power and a second vertical polarization power; A difference is calculated between the second horizontal polarization power and the second vertical polarization power to obtain the transmit beam dual-polarization gain difference.

3. The dual-polarization gain consistency calibration system for transmitting and receiving beams according to claim 1, It is characterized in that The signal receiving module uses fast envelope detection to sample the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal received by the circularly polarized antenna respectively.

4. A method for calibrating the consistency of dual-polarization gain of transmit and receive beams. It is characterized in that The method comprises: Before calibration, a drone equipped with a calibration device is controlled by a remote controller to fly to a predetermined spatial position; wherein the calibration device comprises a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, wherein the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; During calibration, the terminal device sends a first control instruction to the calibration device, and the signal generating module generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal under the action of the first control instruction, and radiates them externally through the circularly polarized antenna; The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal; calculates a receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, and sends the receiving beam dual-polarization gain difference to a terminal device; After receiving the receiving beam dual-polarization gain difference, the terminal device sends a second control instruction to the radar under test; The radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal under the action of the second control instruction; The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar, and samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal by the signal receiving module; The control module calculates a transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device; The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

5. The method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam according to claim 4, It is characterized in that The main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test, comprising: The elevation angles of the circularly polarized antenna and the antenna of the radar under test are adjusted to make the circularly polarized antenna parallel to the antenna of the radar under test, so as to align the main beam of the circularly polarized antenna with the main beam of the antenna of the radar under test.

6. The method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam according to claim 4 or 5, It is characterized in that The radar under test calculates a receiving beam dual-polarization gain difference according to the first horizontal polarization sampling signal and the first vertical polarization sampling signal, including: Performing power detection on the first horizontal polarization sampling signal and the first vertical polarization sampling signal respectively to obtain a first horizontal polarization power and a first vertical polarization power; A difference is calculated between the first horizontal polarization power and the first vertical polarization power to obtain the receive beam dual-polarization gain difference.

7. The method for calibrating the consistency of dual-polarization gain of a transmitting and receiving beam according to claim 4 or 5, It is characterized in that The control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, including: Performing power detection on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain a second horizontal polarization power and a second vertical polarization power; A difference is calculated between the second horizontal polarization power and the second vertical polarization power to obtain the transmit beam dual-polarization gain difference.

8. A method for calibrating the consistency of dual-polarization gain of transmit and receive beams. It is characterized in that The method comprises: Before calibration, a drone equipped with a calibration device is controlled by a remote controller to fly to a predetermined spatial position; wherein the calibration device comprises a signal generating module, a signal receiving module, a circularly polarized antenna, a control module and a communication module, wherein the signal generating module and the signal receiving module are respectively connected to the circularly polarized antenna, and the control module is connected to the signal generating module, the signal receiving module and the communication module; at the predetermined spatial position, the circularly polarized antenna and the antenna of the radar under test meet the far-field condition, and the main beam of the circularly polarized antenna is aligned with the main beam of the antenna of the radar under test; During calibration, the terminal device sends a second control instruction to the radar under test; The radar under test radiates a second horizontally polarized electromagnetic wave signal and a second vertically polarized electromagnetic wave signal under the action of the second control instruction; The circularly polarized antenna receives the second horizontally polarized electromagnetic wave signal and the second vertically polarized electromagnetic wave signal radiated by the measured radar, and samples the second horizontally polarized sampling signal and the second vertically polarized sampling signal by the signal receiving module; The control module calculates a transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, and sends the transmit beam dual-polarization gain difference to the terminal device; After receiving the dual-polarization gain difference of the transmitting beam, the terminal device sends a first control instruction to the calibration device, and the signal generating module generates a first horizontally polarized electromagnetic wave signal and a first vertically polarized electromagnetic wave signal at the same time under the action of the first control instruction, and radiates them externally through the circularly polarized antenna; The radar under test receives and samples the first horizontally polarized electromagnetic wave signal and the first vertically polarized electromagnetic wave signal radiated by the circularly polarized antenna to obtain a first horizontally polarized sampling signal and a first vertically polarized sampling signal; calculates a receiving beam dual-polarization gain difference according to the first horizontally polarized sampling signal and the first vertically polarized sampling signal, and sends the receiving beam dual-polarization gain difference to a terminal device; The terminal device calculates a calibration value according to the dual-polarization gain difference of the receiving beam and the dual-polarization gain difference of the transmitting beam, and sends the calibration value to the radar under test.

9. The method for calibrating the consistency of dual-polarization gain of transmit and receive beams according to claim 8, It is characterized in that The control module calculates the transmit beam dual-polarization gain difference according to the second horizontal polarization sampling signal and the second vertical polarization sampling signal, including: Performing power detection on the second horizontal polarization sampling signal and the second vertical polarization sampling signal respectively to obtain a second horizontal polarization power and a second vertical polarization power; A difference is calculated between the second horizontal polarization power and the second vertical polarization power to obtain the transmit beam dual-polarization gain difference.

10. The method for calibrating the consistency of dual-polarization gain of transmit and receive beams according to claim 8, It is characterized in that The radar under test calculates a receiving beam dual-polarization gain difference according to the first horizontal polarization sampling signal and the first vertical polarization sampling signal, including: Performing power detection on the first horizontal polarization sampling signal and the first vertical polarization sampling signal respectively to obtain a first horizontal polarization power and a first vertical polarization power; A difference is calculated between the first horizontal polarization power and the first vertical polarization power to obtain the receive beam dual-polarization gain difference.

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