高轨SAR多普勒中心补偿的二维姿态控制方法

A Two-dimensional Attitude Steering Method to Compensate Doppler Centroid in GEO SAR

该文提出一种高轨SAR多普勒中心补偿的2维姿态控制方法,在保证波束照射到地球表面的前提下,调整波束中心指向将多普勒中心补偿为零。首先分析了无偏航控制、1维偏航控制情况下的多普勒中心,说明了2维姿态控制的必要性;然后根据零多普勒面与地球表面的交线,在卫星轨道坐标系下,得到了在任意轨道位置将多普勒中心补偿为零的波束中心指向的解析表达式。仿真实验验证了该方法的有效性。

The paper proposes a method of two-dimensional attitude steering to compensate Doppler centroid in Geosynchronous Earth Orbit Synthetic Aperture Radar（GEO SAR）. By guaranteeing the beam illuminating the earth＇s surface, Doppler centroid is compensated to zero by controlling the beam center direction. Firstly, for showing the necessity of two-dimensional attitude steering, Doppler centroid without yaw control and under one-dimensional yaw steering are analyzed. Then, based on the intersection line between the zero-Doppler plane and the earth＇s surface, the calculation expression of beam center direction at any position of the satellite is deduced to compensate Doppler centroid to zero under the satellite obit coordinate. Simulation experiments validate the effectiveness of the proposed method.