用SAR原始数据对雷达脉冲信号失真的校正

THE CORRECTION OF CHIRP RADAR SIGNALS BASED ON SAR RAW DATA

该文提出了一种对雷达发射脉冲进行相位估计的算法。该算法利用Chirp Scaling原理对SAR信号进行距离迁移校正,但仅在方位向波束锐化,然后利用自聚焦的方法(Map Drift,PGA),在距离向进行自聚焦处理,提取距离向的相位误差信息。文中分析了影响相位估计精度的各种因素,并在算法中加入了迭代补偿方法,仿真结果验证了算法的正确性。

This paper introduces an algorithm used in estimation of the phase error of chirp signal. Firstly, the algorithm applies Range Cell Migration Correction (MCRC) to SAR signals with chirp scaling method, and processes on azimuth compression only. Then the phase error of the radar chirp signal is estimated by applying the auto-focus method, for example, Map Drift(MD) or Phase Gradient Algorithm (PGA) to the azimuth processing of signals. Further correction on estimated phase error is applied to discussion of the factors that influent the phase error estimation. The algorithm is proved by computer simulation.