去调频SAR成像处理算法

在合成孔径雷达中,为了提高距离分辨率,一般采用宽频带发射信号。宽频带信号可以有许多形式,如相位编码等,但用得最多的是线性调频(LFM)脉冲信号。由于线性调频信号的特殊性质,对它的处理不仅可用一般的匹配滤波方式,还可用特殊的去调频(dechirp)方式来处理。当雷达在接收回波信号时采用去调频处理方式,能大大减小回波信号的采样率和数据量计算量。文章主要研究了对采用去调频方法的正侧视条带式合成孔径雷达信号进行高分辨率成像的处理算法,并利用仿真数据完成了去调频后的成像,验证了该成像算法的可行性和有效性。

SAR Imaging Processing Algorithm Based on Dechirp

In order to obtain high range resolution in SAR imaging processing algorithm,many types of wideband transmitted waveform are often used,such as phase coded signals,but LFM signal is widely used because of its specialized characteristic.Matched filtering and dechirp processing methods are both adopted in the range compression processing.For LFM waveform,dechirp method provides the ability to alleviate the ADC problem by easing the requirement on the sampling rate and reducing the quantity of data.This paper mainly focuses on high-resolution imaging algorithm of dechirped SAR signals in stripmap mode,and the SAR image is obtained by this algorithm,which proves the feasibility and validity of this imaging algorithm.