Signal Processing of FM-CW SAR Using the Modified Frequency Scaling Algorithm

A modified Frequency Scaling algorithm is presented for FM-CW SAR signal processing. In FM-CW SAR,for the large PRI and the 100% duty cycle of the transmitted pulse,the"stop and go"manner is no more valid. According to the signal processing characteristics of the FM-CW SAR,the problems such as the fast time range walk(FrRW) caused by the motion of the radar during the large PRI,and the range frequency spectrum alias caused by the direct utilization of the traditional Frequency Scaling algorithm,are dis- cussed deeply,the modified algorithm resolved the problems referred of before. The deduction and the simulation proved the algorithm is feasible and correct.