机载双站SAR波束指向误差研究

The Study of Aero Bistatic SAR＇s Beam Pointing Errors

本文基于双站SAR的运动几何结构，建立了机载双站SAR波束指向误差模型，研究了指向误差所引起的回波能量分布的变化，及其带来的多普勒中心频率估计偏差，以及波束指向同步要求的限制条件，分析了它们对成像结果的影响，最后，仿真结果验证了上述分析的有效性．

Based on the moving geometry configuration of aero Bistatic SAR, this paper builds a model of beam pointing errors. Upon this foundation, the paper studies the energy varying of echo wave caused by the pointing errors, the effect of this varying to azimuth Doppler frequency center estimation ,and the limitation to beam pointing synchronization error, then analyses their affection to Bistatic SAR imaging. In the end of the paper, computer＇s simulations are given to prove the valid of these above analysis.