Suppressing azimuth ambiguity in spaceborne SAR images based on compressed sensing  

作　　者：YU Ze LIU Min 

机构地区：[1]School of Electronics and Information Engineering,Beihang University,Beijing 100191,China

出　　处：《Science China(Information Sciences)》2012年第8期1830-1837,共8页中国科学（信息科学）（英文版）

基　　金：supported by National Key Basic Research Program Project(973 Program)of China(Grant No.2010CB731902)

摘　　要：In spaceborne synthetic aperture radar, undersampling at the rate of the pulse repetition frequency causes azimuth ambiguity, which induces ghost into the images. This paper introduces compressed sensing for azimuth ambiguity suppression and presents two novel methods from the perspectives of system design and image formation, known as azimuth random sampling and ambiguity separation, respectively. The first method makes the imaging results for the ambiguity zones as disperse as possible while ensuring that the imaging results for the main scene are affected as little as possible. The second method separates the ambiguity signals from the echoes and achieves imaging results without the ambiguity effect. Simulation results show that the two methods can reduce the ambiguity levels by about 16 dB and 99.37%, respectively.In spaceborne synthetic aperture radar, undersampling at the rate of the pulse repetition frequency causes azimuth ambiguity, which induces ghost into the images. This paper introduces compressed sensing for azimuth ambiguity suppression and presents two novel methods from the perspectives of system design and image formation, known as azimuth random sampling and ambiguity separation, respectively. The first method makes the imaging results for the ambiguity zones as disperse as possible while ensuring that the imaging results for the main scene are affected as little as possible. The second method separates the ambiguity signals from the echoes and achieves imaging results without the ambiguity effect. Simulation results show that the two methods can reduce the ambiguity levels by about 16 dB and 99.37%, respectively.

关 键 词：synthetic aperture radar compressed sensing azimuth ambiguity orthogonal matching pursuit 

分 类 号：TN958[电子电信—信号与信息处理] TN919.81[电子电信—信息与通信工程]