高分辨率星载聚束式SAR成像处理实现方法

The Realizotion of Image Formation Algorithm for High Resolution Spaceborne Spotlight SAR

高分辨率星载聚束式SAR的信号带宽与多普勒带宽很大,为了保证系统的覆盖特性和成像处理精度,常规的成像处理方法已不能适用。为此针对高分辨率(0.3米)星载聚束式SAR,给出一种高精度成像处理实现方法。该方法对Deramp Chirp Scaling算法中的相位误差进行考察,给出了基于三次相位误差校正的星载聚束式DerampChirp Scaling成像算法。计算机仿真结果验证了该方法的有效性。

Signal band and Doppler band are very large in order to realize precise imaging of high-resolution spaceborne spotlight SAR. At the same time normal imaging methods can not satisfy the radar system coverage performance and the precision of imaging. This paper offers a kind of high precision imaging method for high-resolution （0.3m） space borne spotlight SAR. This method utilizes Deramp Chirp Sealing and the cubic correction method, and offers a Deramp Chirp Sealing algorithm with cubic correction for space borne spotlight SAR. The method proved effective by the simulation.