相位梯度自聚焦(PGA)算法是一种高效的自聚焦算法，然而距离向窄波束的假设条件，使其对某些工作体制参数的雷达系统并不适用。加权相位梯度自聚焦(PWE—PGA)算法考虑了距离变化对相位误差的影响，扩展了PGA算法的应用范围。文中对此算法进行了深入研究，提出了一种利用PWE-PGA算法进行条带SAR载机航迹估计的方法，并对影响估计精度的因素进行了深入的分析。

The phase gradient autofocus (PGA) algorithm was been proved to be an efficient autofocus method. The PGA assume a narrow beam in range,so the algorithm can't be applied to some SAR system. Phase Weighted Estimation PGA(PWE PGA)is suggested which takes into consideration the range dependent phase error,so the PGA can be used in more fields. This paper studies the PWE-PGA algorithm and presents a method for estimating the flight path by using it,analyzes the factors which effect on estimation precision.

TN958

教育部优秀青年教师资助项目国防基金项目(00J00.1.1.HK0143)