基于MLBF的毫米波双站SAR前视Omega-k成像算法  

Omega-k algorithm based on MLBF for millimeter wave bistatic forward-looking SAR imaging

作　　者：马超[1] 张小虎[1] 杨建超[1] 顾红[1] 苏卫民[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《红外与毫米波学报》2017年第4期490-497,共8页Journal of Infrared and Millimeter Waves

基　　金：江苏省自然科学基金(BK20160847);国家自然科学基金(61471198)~~

摘　　要：结合毫米波体制和双站毫米波合成孔径雷达(SAR)前视成像技术,开展毫米波双站SAR前视成像算法的研究.在双站SAR前视成像系统中,较大的前视角引入了多普勒质心偏移和严重的距离徙动,因此普通双站SAR的成像算法无法直接移植到双站SAR前视成像中.针对以上问题,论文首先提出了一种基于瞬时多普勒分析的改进Loffeld's Bistatic Formula(MLBF)二维频谱求解方法,相比于现有方法,该方法能更准确的得到双站SAR前视回波信号的二维频谱.在此基础上又推导出了适用于毫米波双站SAR前视成像的Omega-k算法;最后通过仿真实验,验证了提出算法的有效性和优越性.This paper combines millimeter-wave and bastatic forward-looking synthetic aperture radar （BFSAR） techniques, carrying out the research of imaging algorithms for millimeter-wave BFSAR. However, imaging algorithms for BFSAR are the difficulties in this study. Due to the special forward- looking geometry, imaging algorithms for bistatic SAR can not be applied to BFSAR directly. So, this paper proposes a modified Loffeldg Bistatic Formula （MLBF）. The new method compared with other extended Loffeld＇s Bistatic Formula （ELBF） can obtain a bistatic point target reference spectrum, which is accurate enough for bistatic forward-looking configuration. Then, an Omega-k algorithm based on the reference spectrum is derived. Finally, simulations validate the accuracy of the MLBF method and the effectiveness of the Omega-k imaging algorithm.

关 键 词：双站合成孔径雷达 前视成像 MLBF Omega-k算法 

分 类 号：TN958[电子电信—信号与信息处理]