基于滤波器组的星载SAR DPC-MAB技术方位向非均匀采样信号的重构

给出了基于滤波器组对方位向周期性非均匀采样信号重构方位向均匀采样信号的算法。该算法主要利用滤波器组重建信号的原理,由完全重建条件和已知的分析滤波器组得到合成滤波器组,通过得到的合成滤波器组对方位向周期性非均匀采样信号进行重构,得到均匀采样信号。该均匀采样信号被用来消除当多相位中心方位向多波束星载SAR在系统的脉冲重复频率(PRF)偏离理想值时进行成像而产生的成对虚假目标。通过仿真,证明了该算法的有效性。

Reconstruction of nonuniform azimuth sampling signals of space borne SAR DPC-MAB technique based on filter banks

Based on the filter banks,the algorithm of reconstructing the uniform azimuth sampling signals from the periodic nonuniform azimuth sampling signals is proposed.The algorithm mainly makes use of the principle of the filter banks reconstructing signal to obtain the synthetic filter banks from the perfect construction condition and the known analysis filter banks,and then use it to reconstruct the uniform azimuth sampling signals,which is processed to eliminate coupled false targets due to deviation of the practical system pulse repetition frequency(PRF) from the ideal PRF during DPC-MAB SAR image processing.The algorithm proves to be effective according to simulation result.