星地双基地SAR成像模式分析

Imaging Mode Analysis for Space-Based Bistatic SAR

通过对星载合成孔径雷达(SAR)的观测几何模型、地面固定接收机的雷达作用距离模型以及双基地SAR雷达方程的分析,推导出星地双基地SAR系统在正侧视和斜视成像模式下的接收波束照射起始点位置和接收天线的水平转动角速度;讨论了相位延时的补偿,给出了补偿因子,以实现在成像过程中校正因接收机固定不动而引起的相位误差,并为下一步进行外场实验奠定了理论基础。

This paper first analyzes the observational geometry model for the space borne SAR, radar range model for the receiver SAR, and the radar equation of the bistatic SAR system. Secondly, it obtains the different first-location of the radar mapping belt and angular velocity of the antenna in the different imaging mode. The expiation for phase delay and an expiatory factor for the bistatic SAR system are discussed. During the imaging process, the phase error which caused by fixed-receiver will be emendated.