The Correction of Spaceborne SAR Satellite’s Yaw Steering Law based on the Star Tracker High-Precision Measurement
The Doppler centroid is the central frequency of the azimuth spectrum recorded by a synthetic aperture radar(SAR), which will change along with the change of the scan angle or the distance if the situation is not so satisfied, uncompensated variations of the Doppler centroid may cause significant errors during azimuth compression, range migration correction, and geolocalization, and the calibration of SAR images will also become more difficult for high and varying Doppler centroids, which is not expected. The Earth’s rotation and the eccentricity are not 0, these are the main reasons of the change of the Doppler centroid in the radar satellite. The varying of the Doppler centroid can be compensated by the yaw steering law. Even so, the general and intuitionistic methods are given in the direction of the theory and the physics, in the addition, the stability and the accuracy of the control system will not be influenced under the use of the yaw steering law, which is discussed and established within various publications. However, whether the yaw steering law can be adopted in the satellite project, there is no domestic example that can be consulted until now.
Sun Yingmei Chen Junli Wan Xiangcheng Zhangjiuling Wngyun
Shanghai Institute of Satellite Engineering
国际会议
哈尔滨
英文
1007-1009
2010-01-08（万方平台首次上网日期，不代表论文的发表时间）