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Method for imaging space target by on-orbit SAR satellite

A space target, imaging method technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc.

Active Publication Date: 2021-03-16
BEIJING INST OF SPACECRAFT SYST ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, and to provide a method for imaging a space target by an on-orbit SAR satellite, by fully considering the high-speed motion characteristics of the on-orbit SAR satellite and the space target to be imaged, as well as system limitations, combining STK software virtual technology provides a method for imaging space targets by on-orbit SAR satellites, which solves the problems of complex relative motion, difficult to determine geometric relationship, and high accuracy of imaging parameters in the process of imaging space targets by on-orbit SAR satellites

Method used

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  • Method for imaging space target by on-orbit SAR satellite
  • Method for imaging space target by on-orbit SAR satellite

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Embodiment

[0124] Such as image 3 , this part tests the imaging of the International Space Station (ISS) by the Gaofen-3 satellite in orbit, and verifies the validity of the space object imaging method proposed by the present invention for the SAR satellite in orbit. At first according to the input parameter table that table 1 provides and the Gaofen No. 3 satellite and the orbital information of the International Space Station announced by the North American Aerospace Defense Command, according to the method proposed by the present invention, calculate the required parameters to the International Space Station imaging, the results are shown in Table 2. Then set the attitude angle and radar imaging parameters of the GF-3 satellite according to the obtained parameters, form an imaging command package, inject satellites, wait for the imaging time to arrive, start imaging, and obtain the final imaging results.

[0125] Table 1 Input parameter table in the embodiment

[0126]

[0127] A...

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Abstract

The invention relates to a method for imaging a space target by an on-orbit SAR satellite, which fully considers the high-speed relative motion characteristics of the on-orbit SAR satellite and the space target to be imaged and the system limitation, and combines STK software to solve the problems that the relative motion of the SAR satellite and the space target is complex, the geometrical relationship is difficult to determine and the imaging parameter precision requirement is high in the space target imaging process. By selecting a proper pulse repetition frequency, effective reception of the echo of the space target to be imaged is ensured, and interference of emission pulse, sub-satellite point echo, ground scene echo and the like is avoided at the same time. Through the mode of combining satellite attitude maneuver and antenna electric scanning, the beam pointing required by the SAR satellite for space target imaging is realized, the implementation cost and complexity are reduced, and the application range of the on-orbit SAR satellite is expanded.

Description

technical field [0001] The invention relates to a method for imaging a space target by an on-orbit SAR satellite. The radar system parameter design for high-resolution imaging of a space target by an on-orbit SAR satellite belongs to the technical field of radar system design. The space target includes satellites, Space stations, spaceships and rocket terminals, etc. Background technique [0002] There are two main types of microwave imaging radar: synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR). The two are similar in principle. The high resolution in the range direction is achieved by transmitting broadband signals, and the high resolution in the azimuth is obtained by the long virtual aperture array formed by the relative motion between the target and the radar. The main difference between SAR and ISAR lies in the different ways of forming synthetic apertures: SAR is loaded on a moving platform and uses platform movement to form a virtual apert...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/34G01S7/41G01S7/02
CPCG01S13/9004G01S7/34G01S7/41G01S7/023
Inventor 张庆君韩晓磊赵良波刘杰李延周丽萍蔡娅雯藏洁
Owner BEIJING INST OF SPACECRAFT SYST ENG
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