Improved spectrum reconstruction technique based on chirp rate modulation in stepped-frequency SAR  

作　　者：GAO WenBin DING ZeGang ZHU DongLin ZENG Tao LONG Teng 

机构地区：[1]Radar Research Laboratory, School of Information and Electronics

出　　处：《Science China(Information Sciences)》2015年第10期143-153,共11页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61370017,61032009,61120106004)

摘　　要：To improve the efficiencies of the traditional spectrum reconstruction techniques, an improved spec- trum reconstruction technique （ISRT） based on chirp rate modulation （CRM） is proposed. With the help of a CRM operation, a reconstructed wideband signal with a narrow pulse width can be obtained. Compared with the traditional time domain spectrum reconstruction technique （TSRT）, ISRT is less time-consuming since much less samples axe needed. Compared with the traditional frequency domain spectrum reconstruction technique （FSRT）, the reconstructed signal is a chirp signal, which has no limitation on the subsequent imaging algorithm. What is more, processing steps of ISRT are optimized, and the computational burden is less than that of TSRT and FSRT. Both simulation results and real data processing have verified the validity of ISRT.To improve the efficiencies of the traditional spectrum reconstruction techniques, an improved spec- trum reconstruction technique （ISRT） based on chirp rate modulation （CRM） is proposed. With the help of a CRM operation, a reconstructed wideband signal with a narrow pulse width can be obtained. Compared with the traditional time domain spectrum reconstruction technique （TSRT）, ISRT is less time-consuming since much less samples axe needed. Compared with the traditional frequency domain spectrum reconstruction technique （FSRT）, the reconstructed signal is a chirp signal, which has no limitation on the subsequent imaging algorithm. What is more, processing steps of ISRT are optimized, and the computational burden is less than that of TSRT and FSRT. Both simulation results and real data processing have verified the validity of ISRT.

关 键 词：chirp rate modulation （CRM） spectral efficiency improved spectrum reconstruction technique（ISRT） spectrum reconstruction STEPPED-FREQUENCY SAR 

分 类 号：TN911.3[电子电信—通信与信息系统]