High squint attitude maneuver method for fast response SAR satellite

Abstract

The present invention relates to a high squint attitude maneuver method for a fast response SAR satellite, which comprises the following steps: 1) the time when the velocity of a scene center relativeto the satellite is zero is determined; 2) a central time of squint observation and a position vector and a velocity vector of the satellite in the earth centered earth fixed coordinate system at thecentral time of the squint observation are calculated; 3) a start time and an end time of imaging in the squint observation are calculated; 4) the satellite attitude maneuver parameters at the central time of the squint observation are calculated; 5) in a time range from the beginning to the end of the squint observation, the satellite maneuvers according to the attitude maneuver parameters at the central time of the squint observation; 6) injection interfaces for a range angle and an azimuth angle of a beam are reserved in the satellite body coordinate system, and the beam pointing is corrected according to the in-orbit beam pointing calibration value. The invention ensures that an antenna beam accurately points to a target in the high squint observation of the fast response SAR satellite; and at the same time, the Doppler frequency change of each range sampling point meets the imaging requirements.

Description

technical field [0001] The invention belongs to the technical field of space microwave remote sensing, and relates to a large squint attitude maneuvering method of a fast-response SAR satellite. Background technique [0002] In order to improve the observation efficiency and identification ability of spaceborne SAR for military targets, it is necessary to conduct multiple multi-angle observations and imaging of military targets in the left / right side-looking single track from front-sight to rear-sight range. If the phase scanning method is used to realize the front / rear-sight beam scanning in the left / right-sight single track, a huge number of TR modules, feeding networks, and thermal control networks are required to ensure the electrical performance of the antenna beam during scanning. However, these TR units and networks will greatly increase the weight, power consumption and development cost of the entire star. The above problems can be effectively avoided by driving the...

AI Technical Summary

Problems solved by technology

However, these TR units and networks will greatly increase the weight, power consumption and development cost of the entire star

The above problems can be effectively avoided by driving the antenna beam scanning through the maneuvering of fast-response SAR satellites. However, very precise control requirements will be put forward for fast-response SAR satellites. Otherwise, the attitude deviation of the satellite will directly lead to the deviation of the beam pointing, reducing military The observation efficiency of the target increases the complexity of squint SAR image processing

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