机载双站SAR分辨率特性分析

Resolution characteristic analysis for bistatic airborne SAR

通过对机载双站SAR一般空间几何结构的分析,根据收发站运动对目标产生的合多普勒关系,推导了双站SAR地距分辨率和方位分辨率表达式及其方向。详细分析了收发站空间几何关系和速度矢量对分辨率的影响,理论分析与仿真结果表明收发站双基地角和各自的速度矢量是影响双站SAR分辨率的主要因素。研究结果进一步完善了双站SAR理论体系,为系统设计和飞行试验提供理论依据。

Based on general geometrical configuration of airborne Bistatic SAR, the ground range resolution and direction were deduced in this paper. The azimuth resolution and direction, which depends on the transmitting and receiving station movement, were analyzed according to the target Doppler characteristic. The influences of geometrical configuration and velocity vector on the resolution were disussed in detail. The theoretical and simulation results show that bistatic angle and the individual velocity vector are the main factors affecting bistatic SAR resolutions, and this could further consummate Bistatic SAR theory system and provid theory basis for the system design.