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CN-122017801-A - Satellite-borne laser radar stray light testing system and method

CN122017801ACN 122017801 ACN122017801 ACN 122017801ACN-122017801-A

Abstract

The invention provides a stray light testing system and method for a satellite-borne laser radar, comprising a two-dimensional satellite turntable, a satellite body, the satellite-borne laser radar to be tested, a two-dimensional scanning guide rail, a power meter bracket, an optical power meter and a solar illumination simulation system. The invention uses an optical darkroom to simulate an air-over-air cooling background, a xenon lamp large-area array light source simulates sunlight, a five-degree-of-freedom scanning robot drives a scanning mirror to change the irradiation direction of the light source, a satellite-borne laser radar is installed on a two-dimensional satellite turntable along with a satellite body, the two-dimensional satellite turntable is matched with the five-degree-of-freedom scanning robot to realize in-orbit multi-angle solar illumination simulation, the two-dimensional scanning guide rail is used for carrying out two-dimensional scanning on the position of a power meter to realize the full-caliber stray light power test of the entrance pupil of the satellite-borne laser radar, the full-caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar is obtained through the interpolation of a griddata function three-dimensional point, and the stray light power at the radar focal plane is obtained through the simulation calculation of the Tracepro software and the radar three-dimensional model.

Inventors

  • Wei Xiangtong
  • YU YONG
  • PAN CHAO
  • LI FEI
  • ZHANG YUSHI
  • BIAN JI

Assignees

  • 航天长征火箭技术有限公司

Dates

Publication Date
20260512
Application Date
20240830

Claims (10)

  1. 1. The satellite-borne laser radar stray light testing system is characterized by comprising a two-dimensional satellite turntable (1), a satellite body (2) and a satellite-borne laser radar (3) to be tested, which are sequentially connected with the two-dimensional satellite turntable (1), a two-dimensional scanning guide rail (4) connected inside the satellite-borne laser radar (3) to be tested, a power meter bracket (5), an optical power meter (6) and a solar illumination simulation system (7) with output light on a receiving light path of the satellite-borne laser radar (3) to be tested, wherein the two-dimensional satellite turntable (1), the satellite body (2), the satellite-borne laser radar (3) to be tested, the power meter bracket (5) and the optical power meter (6) are all positioned in an optical darkroom; The solar energy simulation system is characterized in that the optical darkroom simulates an air cooling background, a photosensitive surface of the optical power meter (6) is positioned at an entrance pupil of the satellite-borne laser radar (3) to be tested, the solar energy simulation system (7) is used for performing multi-angle solar energy simulation in the optical darkroom, the two-dimensional satellite turntable (1) drives the satellite body (2) and the satellite-borne laser radar (3) to be tested to rotate so as to change the posture of the satellite-borne laser radar (3) to be tested, and the two-dimensional scanning guide rail (4) drives the power meter bracket (5) and the optical power meter (6) to perform X-axis or Y-axis movement so as to perform stray light power test of the entrance pupil caliber of the satellite-borne laser radar (3) to be tested.
  2. 2. The system for testing the stray light of the satellite-borne laser radar according to claim 1, wherein the two-dimensional scanning guide rail (4) comprises an X-axis guide rail (41) connected to the front end inside the satellite-borne laser radar (3) to be tested, a Y-axis guide rail (42) connected to the front end of the X-axis guide rail (41) in a sliding mode, a sliding block (43) connected to the Y-axis guide rail (42), an X-axis driving motor (44) electrically connected with the X-axis guide rail (41), a Y-axis driving motor (45) electrically connected with the Y-axis guide rail (42) and a guide rail controller (46) electrically connected with the X-axis driving motor (44) and the Y-axis driving motor (45), and the optical power meter (6) is connected to the front end of the sliding block (43) through the power meter bracket (5).
  3. 3. The satellite-borne laser radar stray light testing system according to claim 2, further comprising a control system (8) electrically connected with the guide rail controller (46) and the optical power meter (6); the X-axis driving motor (44), the Y-axis driving motor (45), the guide rail controller (46) and the control system (8) are all installed in a control room outside the optical darkroom, and the control system (8) is connected in a computer.
  4. 4. The satellite-borne laser radar stray light testing system according to claim 1, wherein the solar illumination simulation system (7) comprises a five-degree-of-freedom scanning robot (71) connected in the optical darkroom, a scanning mirror (72) connected to the five-degree-of-freedom scanning robot (71) and a xenon lamp large area array light source (73) positioned on an input light path of the scanning mirror (72), and the optical power meter (6) is positioned on an output light path of the scanning mirror (72); The xenon lamp large area array light source (73) simulates sunlight, and the five-degree-of-freedom scanning robot (71) drives the scanning mirror (72) to change the irradiation direction of the xenon lamp large area array light source (73).
  5. 5. The system for testing stray light of the satellite-borne laser radar of claim 4, wherein the irradiation brightness of the xenon lamp large area array light source (73) is the same as the irradiation brightness of sunlight received by the satellite body (2) in an in-orbit state.
  6. 6. The system for testing stray light of the satellite-borne laser radar of claim 4, wherein the two-dimensional satellite turntable (1) is linked with the five-degree-of-freedom scanning robot (71) to perform on-orbit multi-angle solar illumination simulation.
  7. 7. The method for testing stray light of the satellite-borne laser radar according to any one of claims 1-6 is characterized by comprising the following steps: s1, installing the two-dimensional satellite turntable (1), the satellite body (2), the satellite-borne laser radar (3) to be tested, the two-dimensional scanning guide rail (4), the power meter bracket (5), the optical power meter (6) and the solar illumination simulation system (7) in the optical darkroom; S2, planning a test angle and light source brightness, wherein the solar illumination simulation system (7) simulates sunlight to irradiate and output the sunlight to an entrance pupil of the satellite-borne laser radar (3) to be tested, the power meter support (5) moves in an X-axis and Y-axis and records the position of a photosensitive surface of the optical power meter (6) in real time, the optical power meter (6) tests to obtain optical power, and partial caliber stray light power distribution under an in-orbit angle is obtained by combining the position of the photosensitive surface and the optical power; s3, complementing the partial caliber stray light power distribution through griddata function three-dimensional point interpolation to obtain the full caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar; S4, judging whether to replace the sunlight angle simulated by the solar illumination simulation system (7), if so, replacing the test angle, returning to the step S2, and if not, obtaining the full-caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar under illumination of each angle; s5, inputting the full-caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar under the illumination of each angle into Tracepro software, and combining the simulation calculation of the three-dimensional model of the satellite-borne laser radar (3) to be tested to obtain the stray light power at the radar focal plane, so that the satellite-borne laser radar stray light testing method is completed.
  8. 8. The method for testing stray light of the satellite-borne laser radar of claim 7, wherein the step S3 comprises the following steps: S31, extracting the X coordinate of each scanning point on the whole scanning path to obtain a matrix Xa= [ X 1 ,x 2 ,…,x n ]; S32, extracting Y coordinates of each scanning point on the whole scanning path to obtain a matrix ya= [ Y 1 ,y 2 ,…,y n ]; S33, extracting a stray light power value Z measured at each scanning point on the whole scanning path to obtain a matrix za= [ Z 1 ,z 2 ,…,z n ]; s34, uniformly planning interpolation points in a circular caliber range at an entrance pupil of the satellite-borne laser radar (3) to be tested, wherein X coordinates of the interpolation points are X=r×cos (d), Y coordinates of the interpolation points are Y=r×sin (d), r is an interpolation radius, and d is an interpolation angle; S35, interpolating by using a griddata function to obtain a stray light power value Z=griddata (Xa, ya, za, X, Y, 'linear') of an interpolation point, wherein linear is linear interpolation; s36, obtaining the total caliber stray light power distribution surf (X, Y, Z) at the entrance pupil of the satellite-borne laser radar after the calculation of the stray light power value Z of the interpolation point is completed.
  9. 9. The method for testing the stray light of the satellite-borne laser radar is characterized in that step S5 is to introduce a three-dimensional model of the satellite-borne laser radar (3) to be tested into Tracepro software, assign material properties to optical mirror surfaces and material properties to structural materials to be black paint, establish a radar model and a light source incidence plane model according to the incident angle of sun during testing, assign the output light power of each light source incidence plane according to the full-caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar under all angles of illumination, and acquire irradiance values at the view field diaphragm of a radar telescope through the ray tracing function of Tracepro software to obtain the stray light power at the focal plane of the radar.
  10. 10. The method for testing stray light of the satellite-borne laser radar according to claim 7, wherein in the step S1, an X-axis driving motor (44), a Y-axis driving motor (45) and a guide rail controller (46) of the two-dimensional scanning guide rail (4) are connected in a control room outside the optical darkroom; electrically connecting a control system (8) installed in the control room with the two-dimensional satellite turntable (1), the guide rail controller (46), the optical power meter (6) and a five-degree-of-freedom scanning robot (71) of the solar illumination simulation system (7); In the step S2, a test angle is planned by combining with the running track of the satellite-borne laser radar (3) to be tested in the on-orbit period, the brightness of the solar illumination simulation system (7) is planned, the control system (8) controls the X-axis driving motor (44), the Y-axis driving motor (45) and the five-degree-of-freedom scanning robot (71) to carry out on-orbit multi-angle solar illumination simulation in a linked mode, at least two irradiation angles are arranged in the area of the satellite body (2) before shadow entering and after shadow exiting, and one-time scanning is carried out at each angle to obtain partial caliber stray light power distribution at the entrance pupil of the satellite-borne laser radar (3) to be tested in the on-orbit state under each irradiation angle, and the partial caliber stray light power distribution is at least 50 percent.

Description

Satellite-borne laser radar stray light testing system and method Technical Field The invention relates to the technical field of measurement and test, in particular to a stray light test system and method for a satellite-borne laser radar. Background The satellite-borne laser radar detects macroscopic and microscopic characteristics of aerosol and cloud in the atmosphere by detecting scattering echo signals of laser in the atmosphere to acquire atmospheric components, content, cloud quantity and cloud phase state information, and the satellite-borne laser radar is very sensitive to stray light because the intensity of the laser scattering echo signals is weak, usually in the order of nanowatts. Solar background light is a main factor affecting the detection performance of the laser radar, and stray light radiation caused by the satellite surface under the in-orbit illumination condition can also cause stray light to the laser radar. In the early design stage of the satellite-borne laser radar and the satellite body, it is necessary to test the stray light to evaluate the stray light inhibition capability. The current stray light common test method needs to have complete and real spaceborne laser radars to participate in the test, has extremely high cost for large-caliber spaceborne laser radars, and cannot be basically realized in the early design stage. Therefore, there is a need for an economical and efficient system and method for testing stray light of a satellite-borne lidar. Disclosure of Invention The invention provides a stray light testing system and method for a satellite-borne laser radar, which aims to solve the problem of stray light testing of the satellite-borne laser radar. The optical darkroom simulates an air-over-air cooling background, the xenon lamp large area array light source simulates sunlight, the five-degree-of-freedom scanning robot drives the scanning mirror to change the irradiation direction of the light source, the satellite-borne laser radar is mounted on the two-dimensional satellite turntable along with the satellite body, and the two-dimensional satellite turntable is matched with the five-degree-of-freedom scanning robot to realize in-orbit multi-angle solar illumination simulation. The two-dimensional scanning guide rail is arranged in the satellite-borne laser radar, the power meter is arranged on the sliding block of the two-dimensional scanning guide rail through the power meter support, the photosensitive surface of the power meter is positioned at the entrance pupil of the satellite-borne laser radar, and the position of the power meter is subjected to two-dimensional scanning to realize the full-caliber stray light power test of the entrance pupil of the satellite-borne laser radar. The test system is suitable for performing on-orbit stray light simulation test on the satellite-borne laser radar in the pre-grinding stage. The invention provides a satellite-borne laser radar stray light testing system, which comprises a two-dimensional satellite turntable, a satellite body, a to-be-tested satellite-borne laser radar, a two-dimensional scanning guide rail, a power meter bracket, an optical power meter and a solar illumination simulation system, wherein the satellite body and the to-be-tested satellite-borne laser radar are sequentially connected with the two-dimensional satellite turntable; The optical darkroom simulates an air cooling background, the photosensitive surface of the optical power meter is positioned at the entrance pupil of the satellite-borne laser radar to be tested, the solar illumination simulation system performs multi-angle solar illumination simulation in the optical darkroom, the two-dimensional satellite turntable drives the satellite body and the satellite-borne laser radar to be tested to rotate so as to change the posture of the satellite-borne laser radar to be tested, and the two-dimensional scanning guide rail drives the power meter bracket and the optical power meter to move along the X axis or the Y axis so as to perform stray light power test of the entrance pupil aperture of the satellite-borne laser radar to be tested. According to the satellite-borne laser radar stray light testing system, as an optimal mode, the two-dimensional scanning guide rail comprises an X-axis guide rail connected to the front end of the inside of the satellite-borne laser radar to be tested, a Y-axis guide rail connected to the front end of the X-axis guide rail in a sliding mode, a sliding block connected to the Y-axis guide rail, an X-axis driving motor electrically connected with the X-axis guide rail, a Y-axis driving motor electrically connected with the Y-axis guide rail, and a guide rail controller electrically connected with the X-axis driving motor and the Y-axis driving motor, and the optical power meter is connected to the front end of the sliding block through a power meter bracket. The invention relates to a stray light testing system of a s