Satellite-borne microwave radar antenna scanning polarity judging device and testing method

Abstract

The application provides a kind of device and test method for judging scanning polarity of spaceborne microwave radar antenna in the field of active microwave remote sensing instrument, including first horn antenna, second horn antenna, first adjustable moving support, second adjustable moving support, first radio frequency cable, second radio frequency cable, echo simulator and spaceborne microwave radar, first horn antenna is connected to first adjustable moving support, first horn antenna is connected echo simulator by first radio frequency cable, second horn antenna is connected to second adjustable moving support, second horn antenna is connected echo simulator by second radio frequency cable, spaceborne microwave radar is installed on satellite, and echo simulator is placed beside satellite.The application fills the blank in prior art, establishes the device for judging scanning polarity of spaceborne microwave radar antenna, and ensures the consistency of scanning design polarity and actual scanning polarity of spaceborne microwave radar antenna.

Description

Technical Field

[0001] This invention relates to the field of active microwave remote sensing instruments, specifically to a device and test method for determining the scanning polarity of a spaceborne microwave radar antenna. Background Technology

[0002] Spaceborne microwave radar is an active microwave remote sensing instrument with advantages such as all-day, all-weather, high precision, and long-term stable continuous observation. It achieves large-scale satellite detection through phased array scanning and is currently widely used in weather forecasting, resource exploration, marine monitoring, and disaster monitoring.

[0003] The scanning polarity of the spaceborne microwave radar antenna is a prerequisite for the normal operation of the instrument and for acquiring data. It is also an important basis for the instrument to analyze and measure the object. Measuring the scanning polarity of the spaceborne microwave radar antenna to ensure that the design results are consistent with the actual results is an essential part of the satellite installation and testing work.

[0004] In the design requirements of spaceborne microwave radar, there are always clear requirements for the scanning polarity and data acquisition polarity of the instrument. Incorrect instrument scanning polarity or data polarity will affect the data inversion products, and in severe cases, it can lead to large deviations in weather forecasts and disaster monitoring, causing serious consequences. Polarity testing of the spaceborne microwave radar antenna is necessary to ensure that the polarity implementation method is consistent with the design method, thus guaranteeing the accuracy of the instrument data.

[0005] A search of existing technologies revealed that patent document CN101464511A (application number 200910077121.5) discloses a method for determining the operating beam position of a spaceborne synthetic aperture radar. This method calculates the leading and trailing edge echo times of the transmitted signal and the nadir interference band using input parameters. Based on the results, it further calculates the slant range between the radar and the interference area, and the viewing angle of the interference area relative to the radar. Based on this, it determines the pulse repetition frequency set, and then determines the beam pointing of the radar antenna and verifies the determination result. However, this existing technology cannot directly determine the antenna scanning polarity. It relies on precise calculations to determine the radar antenna beam pointing, and then compares the time sequence of two adjacent beam pointing to indirectly determine the antenna scanning polarity. This method is complex and unsuitable for ground-based determination.

[0006] Patent document CN102738598A (application number 201210225846.6) discloses a millimeter-wave phased array antenna and its beam scanning method. The beam scanning method includes disassembling the planar microstrip antenna array and active channel network; using a vector network analyzer to obtain a data table showing the relationship between the amplitude and phase of each active channel network and the control voltage; calculating the required amplitude and phase of each active channel network based on the required beam scanning angle; and selecting the control voltage with the smallest error value from the obtained data table using an error algorithm for beam scanning. This prior art proposes a phased array beam scanning method based on vector modulation technology, aiming to reduce beam scanning errors by eliminating differences in channel amplitude and phase settings caused by chip variations and assembly. However, this method cannot directly determine the beam scanning polarity and cannot quickly determine the scanning polarity using a ground-based horn antenna.

[0007] Patent document CN113176567A (application number 202110309251.8) discloses a control method, apparatus, and system for SAR azimuth beam scanning. The control method includes the following steps: obtaining the original number of dwell pulses in each azimuth direction during azimuth beam scanning; wherein the original number of dwell pulses is a non-integer and is used to characterize the number of pulses transmitted by the SAR antenna to the ground in each azimuth direction; in response to a range direction switch, accumulating the fractional part of the original dwell pulse count for the next azimuth direction using a carry accumulator to obtain an accumulation result; wherein the initial value of the carry accumulator is the fractional part of the original dwell pulse count for the current azimuth direction; the accumulation result is used to characterize whether the carry accumulator overflows; and determining the target dwell pulse count for the next azimuth direction based on the integer part of the original dwell pulse count and the accumulation result. Although this prior art can improve the pointing accuracy of antenna beam scanning, it does not involve a method for testing the polarity of antenna beam scanning.

[0008] Currently, no literature on satellite-borne microwave radar antenna scanning polarity determination devices and testing methods has been found. Therefore, it is urgent to develop and establish dedicated equipment for testing the scanning polarity of satellite-borne microwave radar antennas. Conducting antenna scanning polarity tests under the actual working conditions of the microwave radar installed on the satellite is crucial for realizing the normal scanning and data acquisition functions of satellite-borne microwave radar. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a device and method for determining the scanning polarity of a spaceborne microwave radar antenna.

[0010] According to the present invention, a satellite-borne microwave radar antenna scanning polarity determination device includes a first horn antenna, a second horn antenna, a first adjustable movable support, a second adjustable movable support, a first radio frequency cable, a second radio frequency cable, an echo simulator, and a satellite-borne microwave radar. The first horn antenna is connected to the first adjustable movable support and is connected to the echo simulator through the first radio frequency cable. The second horn antenna is connected to the second adjustable movable support and is connected to the echo simulator through the second radio frequency cable. The satellite-borne microwave radar is installed on a satellite, and the echo simulator is placed next to the satellite.

[0011] In some embodiments, the first horn antenna and the second horn antenna switch operation under the control of the echo simulator;

[0012] When the first horn antenna is working, the second horn antenna stops working;

[0013] When the second horn antenna is working, the first horn antenna stops working.

[0014] In some embodiments, a first horn antenna or a second horn antenna receives the radiated signal from the spaceborne microwave radar, an echo simulator processes the radiated signal to generate a simulated echo signal, and the first horn antenna or the second horn antenna forwards the simulated echo signal to the spaceborne microwave radar.

[0015] In some embodiments, the distance between the first adjustable movable support and the second adjustable movable support and the spaceborne microwave radar is 0.8-1.2m respectively.

[0016] In some embodiments, the axes of the first horn antenna and the second horn antenna are kept on the same horizontal line.

[0017] In some embodiments, the first horn antenna is located 50-60cm to the right of the center of the spaceborne microwave radar antenna array, and the second horn antenna is located 50-60cm to the left of the center of the spaceborne microwave radar antenna array.

[0018] In some embodiments, the height of the first horn antenna, the second horn antenna, and the spaceborne microwave radar antenna array is maintained at 3-5m.

[0019] In some embodiments, an absorbing wall is also included, located at a distance of 2.5-3.5m from the radiating surface of the spaceborne microwave radar antenna.

[0020] In some embodiments, the spaceborne microwave radar employs a phased array radar, which achieves wide-range field-of-view detection through electronic scanning.

[0021] The present invention also provides a test method for a spaceborne microwave radar antenna scanning polarity determination device, comprising the following steps:

[0022] Step 1: Select the corresponding model of the first and second horn antennas based on the operating frequency of the spaceborne microwave radar.

[0023] Step 2: The first horn antenna and the second horn antenna are respectively mounted on the first adjustable movable support and the second adjustable movable support at a distance of 1m from the radiation surface of the satellite microwave radar antenna.

[0024] Step 3: Adjust the relative positions of the first adjustable movable support and the second adjustable movable support to ensure that the first horn antenna and the second horn antenna are at the same height and can receive the radiation signal from the spaceborne microwave radar antenna.

[0025] Step 4: Establish the test status of the spaceborne microwave radar product. Connect the first and second horn antennas to the ground echo simulator and build an absorbing wall about 3m away from the radiation surface of the spaceborne microwave radar antenna.

[0026] Step 5: The spaceborne microwave radar is powered on according to the satellite power-on procedure. The echo simulator controls the first horn antenna to receive the signal transmitted by the spaceborne microwave radar, while the second horn antenna is in standby mode. The spaceborne microwave radar scanning mode is then activated.

[0027] Step 6: The echo simulator processes the signal transmitted by the spaceborne microwave radar received by the first horn antenna to generate a simulated echo signal, which is then forwarded to the spaceborne microwave radar through the first horn antenna.

[0028] Step 7: Complete the acquisition of echo data relayed by the first horn antenna and obtain the response curve of the first horn antenna receiving the transmitted signal from the spaceborne microwave radar.

[0029] Step 8: Send the command to stop scanning mode of the spaceborne microwave radar. The echo simulator controls the second horn antenna to receive the signal transmitted by the spaceborne microwave radar. The first horn antenna is in standby mode. Start the scanning mode of the spaceborne microwave radar.

[0030] Step 9: The echo simulator processes the signal transmitted by the spaceborne microwave radar received by the second horn antenna to generate a simulated echo signal, which is then forwarded to the spaceborne microwave radar through the second horn antenna.

[0031] Step 10: Complete the acquisition of echo data relayed by the second horn antenna and obtain the response curve of the second horn antenna receiving the transmitted signal from the spaceborne microwave radar.

[0032] Step 11: Based on the response curve, complete the polarity determination of the satellite-borne microwave radar antenna scanning.

[0033] In some embodiments, the first horn antenna and the second horn antenna in step three are set at the same height according to the instantaneous field of view and the magnitude of the radiated signal of the spaceborne microwave radar itself.

[0034] In some embodiments, the simulated echo signals in steps six and nine are set according to the operating frequency band of the spaceborne microwave radar and the distance between the spaceborne microwave radar antenna and the first horn antenna and the second horn antenna.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] This invention fills a gap in the prior art by establishing a test device for antenna scanning polarity of microwave radar installed under actual satellite operating conditions, ensuring the consistency between the design polarity and the actual polarity of the satellite-borne microwave radar antenna scanning. Attached Figure Description

[0037] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the structure of the present invention;

[0039] Figure 2 This is a flowchart of the testing method of the present invention;

[0040] Figure 3 This is a diagram showing the polarity test results of the first horn antenna in this invention;

[0041] Figure 4 This is a diagram showing the polarity test results of the second horn antenna in this invention.

[0042] Numbering on the map:

[0043] Satellite 1, Spaceborne Microwave Radar 2, First Horn Antenna 3, Second Horn Antenna 4, Echo Simulator 5, First Radio Frequency Cable 6, Second Radio Frequency Cable 7, First Adjustable Movable Support 8, Second Adjustable Movable Support 9, Wave Absorbing Wall 10. Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0045] Example 1

[0046] According to the present invention, a satellite-borne microwave radar antenna scanning polarity determination device is provided, based on... Figure 1It is known that the system includes a first horn antenna 3, a second horn antenna 4, a first adjustable movable support 8, a second adjustable movable support 9, a first radio frequency cable 6, a second radio frequency cable 7, an echo simulator 5, a spaceborne microwave radar 2, and an absorbing wall 10. The first horn antenna 3 is connected to the first adjustable movable support 8 and is connected to the echo simulator 5 via the first radio frequency cable 6. The second horn antenna 4 is connected to the second adjustable movable support 9 and is connected to the echo simulator 5 via the second radio frequency cable 7. The spaceborne microwave radar 2 is mounted on satellite 1, and the echo simulator 5 is placed next to satellite 1. Preferably, the distance between the first adjustable movable support 8 and the second adjustable movable support 9 and the spaceborne microwave radar 2 is 1m, ensuring that the axes of the first horn antenna 3 and the second horn antenna 4 are kept on the same horizontal line. The absorbing wall 10 is located 3m away from the antenna radiation surface of the spaceborne microwave radar 2. The spaceborne microwave radar 2 is a phased array radar, and it achieves wide-range field-of-view detection through electronic scanning.

[0047] Working principle: The first horn antenna 3 and the second horn antenna 4 switch between working under the control of the echo simulator 5;

[0048] When the first horn antenna 3 is working, the second horn antenna 4 stops working; the first horn antenna 3 receives the radiated signal from the spaceborne microwave radar 2, the echo simulator 5 processes the radiated signal to generate a simulated echo signal, and the first horn antenna 3 forwards the simulated echo signal to the spaceborne microwave radar 2.

[0049] When the second horn antenna 4 is working, the first horn antenna 3 stops working; the second horn antenna 4 receives the radiation signal from the spaceborne microwave radar 2, the echo simulator 5 processes the radiation signal to generate a simulated echo signal, and the second horn antenna 4 forwards the simulated echo signal to the spaceborne microwave radar 2.

[0050] More specifically, the first horn antenna 3 and the second horn antenna 4 are used to receive the antenna radiation signal of the spaceborne microwave radar 2, and process the signal through the wireless radiation relay echo simulator 5 and send it to the spaceborne microwave radar 2.

[0051] The echo simulator 5 is used to switch the operation of the first horn antenna 3 and the second horn antenna 4, as well as to perform delay and power amplification processing on the received signals of the first horn antenna 3 and the second horn antenna 4, and to feed the processed signals into the first horn antenna 3 and the second horn antenna 4 through the radio frequency cable.

[0052] Example 2

[0053] This invention also provides a test method for a spaceborne microwave radar antenna scanning polarity determination device, based on... Figure 2 As shown, it includes the following steps:

[0054] Step 1: Select the corresponding model of the first horn antenna 3 and the second horn antenna 4 according to the operating frequency of the spaceborne microwave radar 2.

[0055] Step 2: The first horn antenna 3 and the second horn antenna 4 are respectively mounted on the first adjustable movable support 8 and the second adjustable movable support 9 at a distance of 1m from the antenna radiation surface of the spaceborne microwave radar 2.

[0056] Step 3: Adjust the relative positions of the first adjustable movable support 8 and the second adjustable movable support 9 to ensure that the first horn antenna 3 and the second horn antenna 4 are at the same height and can receive the radiation signal from the satellite microwave radar 2 antenna.

[0057] Step 4: Establish the test status of the spaceborne microwave radar 2 product. Connect the ground echo simulator 5 to the first horn antenna 3 and the second horn antenna 4. Build an absorbing wall 10 about 3m away from the antenna radiation surface of the spaceborne microwave radar 2.

[0058] Step 5: The spaceborne microwave radar 2 is powered on according to the power-on procedure of satellite 1. The echo simulator 5 controls the first horn antenna 3 to receive the signal transmitted by the spaceborne microwave radar 2, and the second horn antenna 4 is in standby mode. The scanning working mode of the spaceborne microwave radar 2 is turned on.

[0059] Step 6: The echo simulator 5 processes the signal received by the first horn antenna 3 from the spaceborne microwave radar 2 to generate a simulated echo signal, which is then forwarded to the spaceborne microwave radar 2 through the first horn antenna 3.

[0060] Step 7: Complete the acquisition of echo data relayed by the first horn antenna 3, and obtain the response curve of the first horn antenna 3 receiving the transmitted signal from the spaceborne microwave radar 2;

[0061] Step 8: Send the command to stop scanning mode of the spaceborne microwave radar 2. The echo simulator 5 controls the second horn antenna 4 to receive the signal transmitted by the spaceborne microwave radar 2. The first horn antenna 3 is in standby mode. The scanning mode of the spaceborne microwave radar 2 is turned on.

[0062] Step 9: The echo simulator 5 processes the signal transmitted by the spaceborne microwave radar 2 received by the second horn antenna 4 to generate a simulated echo signal, and then forwards it to the spaceborne microwave radar 2 through the second horn antenna 4.

[0063] Step 10: Complete the acquisition of echo data relayed by the second horn antenna 4, and obtain the response curve of the second horn antenna 4 receiving the transmitted signal from the spaceborne microwave radar 2;

[0064] Step 11: Based on the response curve, complete the polarity determination of the two antennas of the spaceborne microwave radar.

[0065] More specifically, in step three, the first horn antenna 3 and the second horn antenna 4 are positioned at the same height based on the instantaneous field of view and the magnitude of the radiated signal of the spaceborne microwave radar 2. The simulated echo signals in steps six and nine are set according to the operating frequency band of the spaceborne microwave radar 2 and the distance between the antennas of the spaceborne microwave radar 2 and the first and second horn antennas 3 and 4.

[0066] Example 3

[0067] This embodiment 3 is based on embodiments 1-2. The first horn antenna 3 is located 50-60cm to the right of the center of the antenna array of the spaceborne microwave radar 2, and the second horn antenna 4 is located 50-60cm to the left of the center of the antenna array of the spaceborne microwave radar 2, as detailed below:

[0068] The operating center frequency of the spaceborne microwave radar 2 is 13.35 GHz. A corresponding 13.35 GHz horn antenna is selected. The first horn antenna 3 is placed 1m from the radiating surface of the spaceborne microwave radar 2 antenna, approximately 50cm from the radar antenna in the -Y direction. The second horn antenna 4 is placed 1m from the radiating surface of the spaceborne microwave radar 2 antenna, approximately 50cm from the radar antenna in the +Y direction. The center height of the spaceborne microwave radar 2 antenna array is approximately 4m. The relative positions of the first movable support 8 and the second movable support 9 are adjusted to ensure that the centers of the first horn antenna 3 and the second horn antenna 4 are at a height of 4m and can receive the radiated signal from the spaceborne microwave radar 2 antenna. An absorbing wall 10 is constructed approximately 3m from the antenna radiating surface, i.e., absorbing walls are laid directly opposite the antenna radiating surface and on both sides. Figure 1 As shown.

[0069] After satellite 1 is powered on according to the procedure, the onboard microwave radar 2 starts up normally and enters scanning mode. The echo simulator 5 processes the signal transmitted by the onboard microwave radar 2 received by the first horn antenna 3 or the second horn antenna 4 to generate a simulated echo signal, which is then relayed to the onboard microwave radar 2 through the first horn antenna 3 or the second horn antenna 4. The onboard microwave radar 2 collects data from each point within the scanning area. The scanning area of ​​the onboard microwave radar 2 ranges from -21° to 21° (corresponding to -Y to +Y in the satellite platform coordinate system), with a scanning step of 0.7°, a total of 59 scanning footprints, and 800 sampling power points for each scanning footprint. The data collection area is within ±21°.

[0070] After data acquisition is completed, data processing is performed. Based on the scanning method and data acquisition order of the spaceborne microwave radar 2, the response curves of the received echo power value and power sampling points of the spaceborne microwave radar 2 are obtained, such as... Figure 3 and Figure 4As shown, the responses of the first horn antenna 3 and the second horn antenna 4 to the transmitted signals of the spaceborne microwave radar 2 are reflected respectively, thereby determining whether the scanning polarity of the spaceborne microwave radar 2 antenna is consistent with the design.

[0071] In summary, this invention fills a gap in the prior art and establishes a test device for antenna scanning polarity of microwave radar 2 installed under actual satellite operating conditions, ensuring the consistency between the antenna scanning design polarity and the actual polarity of the spaceborne microwave radar 2.

[0072] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0073] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A test method for a spaceborne microwave radar antenna scanning polarity determination device, characterized in that, The satellite-borne microwave radar antenna scanning polarity determination device includes: a first horn antenna (3), a second horn antenna (4), a first adjustable movable bracket (8), a second adjustable movable bracket (9), a first radio frequency cable (6), a second radio frequency cable (7), an echo simulator (5), and a satellite-borne microwave radar (2). The first horn antenna (3) is connected to the first adjustable movable bracket (8), and the first horn antenna (3) is connected to the echo simulator (5) through the first radio frequency cable (6). The second horn antenna (4) is connected to the second adjustable movable bracket (9), and the second horn antenna (4) is connected to the echo simulator (5) through the second radio frequency cable (7). The satellite-borne microwave radar (2) is installed on the satellite (1), and the echo simulator (5) is placed next to the satellite (1). Includes the following steps: Step 1: Select the first horn antenna (3) and the second horn antenna (4) of the corresponding model according to the operating frequency of the spaceborne microwave radar (2). Step 2: The first horn antenna (3) and the second horn antenna (4) are respectively mounted on the first adjustable movable support (8) and the second adjustable movable support (9) at a distance of 1m from the antenna radiation surface of the satellite microwave radar (2); Step 3: Adjust the relative positions of the first adjustable movable support (8) and the second adjustable movable support (9) to ensure that the first horn antenna (3) and the second horn antenna (4) are at the same height and can receive the antenna radiation signal of the spaceborne microwave radar (2); Step 4: Establish the product test status of the spaceborne microwave radar (2). The ground echo simulator (5) is connected to the first horn antenna (3) and the second horn antenna (4). An absorbing wall (10) is built 3m away from the antenna radiation surface of the spaceborne microwave radar (2). Step 5: The spaceborne microwave radar (2) is powered on according to the power-on procedure of the satellite (1). The echo simulator (5) controls the first horn antenna (3) to receive the transmitted signal of the spaceborne microwave radar (2). The second horn antenna (4) is in standby mode. The scanning working mode of the spaceborne microwave radar (2) is turned on. Step six, the echo simulator (5) processes the signal transmitted by the spaceborne microwave radar (2) received by the first horn antenna (3) to generate a simulated echo signal, and forwards it to the spaceborne microwave radar (2) through the first horn antenna (3). Step 7: Complete the acquisition of echo data relayed by the first horn antenna (3) and obtain the response curve of the first horn antenna (3) receiving the transmitted signal of the spaceborne microwave radar (2); Step 8: Send the command to stop scanning mode of the spaceborne microwave radar (2). The echo simulator (5) controls the second horn antenna (4) to receive the transmitted signal of the spaceborne microwave radar (2). The first horn antenna (3) is in standby mode. The scanning mode of the spaceborne microwave radar (2) is turned on. Step nine: The echo simulator (5) processes the signal transmitted by the spaceborne microwave radar (2) received by the second horn antenna (4) to generate a simulated echo signal, and forwards it to the spaceborne microwave radar (2) through the second horn antenna (4). Step 10: Complete the acquisition of echo data relayed by the second horn antenna (4) and obtain the response curve of the second horn antenna (4) receiving the transmitted signal of the spaceborne microwave radar (2); Step 11: Based on the response curve, complete the polarity determination of the satellite-borne microwave radar antenna scanning.

2. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 1, characterized in that, The first horn antenna (3) and the second horn antenna (4) switch between working under the control of the echo simulator (5); When the first horn antenna (3) is working, the second horn antenna (4) stops working; When the second horn antenna (4) is working, the first horn antenna (3) stops working.

3. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 2, characterized in that, The first horn antenna (3) or the second horn antenna (4) receives the radiation signal from the spaceborne microwave radar (2), the echo simulator (5) processes the radiation signal to generate a simulated echo signal, and the first horn antenna (3) or the second horn antenna (4) forwards the simulated echo signal to the spaceborne microwave radar (2).

4. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 1, characterized in that, The distances between the first adjustable movable support (8) and the second adjustable movable support (9) and the spaceborne microwave radar (2) are 0.8-1.2m respectively.

5. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 4, characterized in that, The axes of the first horn antenna (3) and the second horn antenna (4) are kept on the same horizontal line.

6. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 4, characterized in that, The first horn antenna (3) is located 50-60cm to the right of the center of the antenna array of the spaceborne microwave radar (2), and the second horn antenna (4) is located 50-60cm to the left of the center of the antenna array of the spaceborne microwave radar (2).

7. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 1, characterized in that, The antenna array height of the first horn antenna (3), the second horn antenna (4), and the satellite microwave radar (2) is maintained at 3-5m.

8. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 1, characterized in that, The absorbing wall (10) is located 2.5-3.5m away from the antenna radiation surface of the spaceborne microwave radar (2).

9. The test method for the spaceborne microwave radar antenna scanning polarity determination device according to claim 1, characterized in that, The spaceborne microwave radar (2) adopts a phased array radar, and the spaceborne microwave radar (2) achieves large-area field of view detection through electronic scanning.

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