Satellite platform attitude maneuver method capable of achieving ultrahigh-resolution sliding spotlight mode of satellite-borne SAR

Abstract

The invention discloses a satellite platform attitude maneuver method capable of achieving an ultrahigh-resolution sliding spotlight mode of satellite-borne SAR. The method comprises the following steps: firstly determining a whole sliding spotlight imaging time start-stop range according to observation scene position and satellite platform orbit information, wherein the time start-stop range is a satellite platform attitude maneuver time range; secondly determining a central rotating point of a whole attitude maneuver period by using SAR antenna parameters, resolution indexes and sub-satellite point view angle of the scene center; and finally determining a three-axis direction unit vector of a satellite platform in the maneuver period according to the rotating central point position and the platform attitude maneuver time range so as to obtain the accurate attitude maneuver mode of the satellite platform in the whole sliding spotlight imaging period and ensure that the satellite platform attitude maneuver mode reaches corresponding imaging indexes and finally required satellite-borne SAR image effect.

Description

technical field [0001] The invention relates to a satellite platform attitude maneuver method for realizing a space-borne SAR ultra-high resolution sliding beamforming mode, and belongs to the technical field of space microwave remote sensing. Background technique [0002] In order to meet the increasing reconnaissance requirements of the spaceborne SAR system, it is necessary to use the ultra-wideband transmission signal combined with the ultra-large rotation angle sliding beamforming mode to achieve ultra-high resolution in the range and azimuth directions respectively. If phase electrical scanning is used to realize ultra-wideband large-angle beam scanning, a huge number of TR modules, feeding networks, and thermal control networks are required to ensure the electrical performance of the antenna during beam scanning. However, these TR units and networks will greatly increase the weight, power consumption and development cost of the entire star, increasing the difficulty o...

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, increasing the difficulty of engineering realization

In addition, when the antenna beam is scanned to a larger angle by using the phase electric scanning method, its peak gain will be attenuated to a greater extent

Images