Exact spectrum of non-linear chirp scaling and its application in geosynchronous synthetic aperture radar imaging

The Journal of Engineering

Chen Qi¹  He Feng¹  Liang Diannong²  Li Dexin² 

[1] School of Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, People's Republic of China

关键词: FM rate problem;    time-variant frequency modulation;    NLCS function;    geosynchronous synthetic aperture radar imaging;    GEO-SAR imaging;    nonlinear chirp scaling;    geosynchronous synthetic aperture radar;    imaging performance;    SAR imaging;   

DOI  :  10.1049/joe.2013.0025

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Non-linear chirp scaling (NLCS) is a feasible method to deal with time-variant frequency modulation (FM) rate problem in synthetic aperture radar (SAR) imaging. However, approximations in derivation of NLCS spectrum lead to performance decline in some cases. Presented is the exact spectrum of the NLCS function. Simulation with a geosynchronous synthetic aperture radar (GEO-SAR) configuration is implemented. The results show that using the presented spectrum can significantly improve imaging performance, and the NLCS algorithm is suitable for GEO-SAR imaging after modification.

【 授权许可】

CC BY