反向投影成像算法的理论分析及目标特征恢复

分析了用于超宽带冲激信号 SAR系统的反向投影 (BP)成像算法 ,得出了BP算法固有的旁瓣形成解析式及旁瓣分布 ,说明了成像结果中系统频率特性对目标特征的频率有加权作用 ,并且是造成成像畸变的主要原因。提出了对回波信号逆滤波以恢复目标特征及采用匹配滤波来抑制成像旁瓣的方法。对冲激雷达实验系统的成像数据的处理结果表明 ,提出的逆滤波方法是有效的。

Theory Analysis of Back Projection Imaging Algorithm and Target Signature Restoring

In this paper, back projection algorithm used in ultrawideband impulse signal SAR is analysed, sidelobe resolution and distribution inhered in BP algorithm is obtained. Target signature is weighted with system frequency property, arosing image distorting, in frequency-domain. An inverse filter for return signal to restore target signature and a restraining image sidelobe method used matched filter are provided. The method is proved by imaging results based on impulse radar experimental system.