A Method for On-orbit Deformation Calibration of Azimuth Multi-channel Spaceborne SAR Antenna
A calibration method and multi-channel technology, applied in the field of antenna on-orbit deformation calibration, can solve the problems of limited accuracy and high cost, and achieve the effect of ensuring calibration accuracy
Active Publication Date: 2022-04-26
AEROSPACE INFORMATION RES INST CAS
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[0011] The purpose of the present invention is to propose a method for on-orbit deformation calibration of azimuth multi-channel spaceborne SAR antennas to solve the problems of high cost and limited accuracy of existing methods
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[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] According to an embodiment of the present invention, the acquisition or calculation method of each phase error is given as follows:
[0031] When the azimuth multi-channel spaceborne SAR uses the external calibration calibration imaging mode of the predetermined working mode to image the uniform scene on the ground (such as tropical rainforest), using the mature azimuth cross-correlation algorithm for the multi-channel echo data can accuratel...
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The invention relates to a method for on-orbit deformation calibration of an azimuth multi-channel space-borne SAR antenna, comprising the following steps: Step 1. Acquire echoes and internal calibration data based on an external calibration mode; wherein, the inter-channel phase of the multi-channel space-borne SAR There are three sources of error: one is the on-orbit deformation of the passive antenna array, the other is the phase error between the active receiving channels, and the third is the satellite attitude control error. The total phase error between the channels in the echo data is the sum of the above three parts Step 2, extract the total phase error between channels based on echo data; Step 3, extract the phase error between active channels based on internal calibration data; Step 4, extract the phase error between channels caused by satellite attitude based on echo data; Step 5, calculate The on-orbit deformation of the antenna causes a phase error between channels; step 6, calculate the on-orbit deformation of the antenna.
Description
technical field [0001] The invention belongs to the technical field of radar system testing, and specifically proposes an antenna on-orbit deformation calibration method for azimuth multi-channel spaceborne synthetic aperture radar (SAR). Background technique [0002] Spaceborne synthetic aperture radar can realize all-day and all-weather ground imaging, and is a widely used microwave remote sensing method. Azimuth multi-channel technology can greatly increase the imaging width of spaceborne SAR while keeping the resolution unchanged. It is a new technology that has been applied both at home and abroad. [0003] The azimuth multi-channel spaceborne SAR system has multiple receiving channels. If there is a large phase error between the receiving channels, false targets will be generated in the SAR image, which will seriously affect the image quality. There are many factors that lead to the phase error between channels, one of which has a greater impact is the on-orbit deform...
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IPC IPC(8): G01S7/40G01S7/41
CPCG01S7/4004G01S7/41
Inventor 张志敏邓云凯张磊吴侠义吴亮孙慧峰欧乃铭王伟肖灯军
Owner AEROSPACE INFORMATION RES INST CAS