运动测量误差对带状SAR成像影响的定量分析

定量分析运动测量误差对成像的影响是实际机载SAR系统设计中的重要问题。本导出了沿方位向及瞄准线同时存在恒定位置误差和恒定速度误差，以及同时存在恒定位置误差、恒定速度误差及恒定加速度两种情况下，SAR回波信号压缩波形主瓣偏移、二次相位误差、三次相位误差及四次相位误差的解析式。对4个点目标得到的方位像仿真结果和利用中解析式计算结果一致，证明了推导的正确性。

Quantitative Analysis of Motion Measurement Errors on Strip Mapping SAR Imaging

Because the accuracy of motion sensor is limited, it is extemely important to determine the effect of motion measurement errors on the quality indexes of high resolution SAR (Synthetic Aperture Radar) imaging. Equations in Refs. only deal with such an effect in the following two simple cases: (1) constant position, velocity and acceleration errors exist only in the azimuth direction, (2) constant position, velocity and acceleration errors exist only in the range direction. We believe we are the first to derive analytical equations of strip mapping SAR system quality indexes, which are four in number and are functions of six errors: constant position, velocity and acceleration errors along both azimuth and range directions. We use Eqs.(12) through (15) to calculate these four quality indexes. We simulate the effect of these errors of GPS/SINS (Global Positioning System/Strapdown Inertial Navigation System) integrated system on SAR cross imaging of four point targets. Simulation results show preliminarily that the derived equations are correct.