Angular extent effect of micromotion target in SAR image by polar format algorithm

被引：4
|
作者：
Deng, Bin [1 ]
Qin, Yuliang [1 ]
Wang, Hongqiang [1 ]
Li, Yanpeng [1 ]
机构：
[1] Natl Univ Def Technol, Sch Elect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS | 2014年 / 25卷 / 03期
基金：
中国国家自然科学基金;
关键词：
synthetic aperture radar (SAR); micromotion; micro-Doppler; polar format algorithm (PFA); angular extent effect; MICRO-DOPPLER ANALYSIS; VIBRATING TARGETS;
D O I：
10.1109/JSEE.2014.00049
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Target micromotion not only plays an important role in target recognition but also leads to esoteric characteristics in synthetic aperture radar (SAR) imaging. This paper finds out an interesting phenomenon, i.e. the angular extent effect, in micromotion target images formulated by the polar format algorithm. A micromotion target takes on multiple pairs of paired echoes (PEs) around the true point, and each PE extends for an angle which is exactly equal to the angular extent of the synthetic aperture, regardless of the micromotion frequency. The effect is derived and interpreted by using the characteristics of Bessel functions. Then it is demonstrated by simulation experiments of a target with different micromotion frequencies. The revelation and interpretation of the effect is highly beneficial to micromotion-target SAR image understanding as well as target recognition.
引用
收藏
页码：428 / 433
页数：6
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