非均匀采样SAR信号的不模糊重构与成像  

Unambiguous Reconstruction and Imagingof Nonuniform Sampling SAR Signal

作　　者：刘光炎[1] 孟喆[1] 胡学成[1] 

机构地区：[1]南京电子技术研究所,南京210039

出　　处：《电子科技大学学报》2010年第6期850-853,858,共5页Journal of University of Electronic Science and Technology of China

摘　　要：SAR信号的非均匀采样给信号频谱带来噪声,产生频谱混叠,降低成像质量;在宽幅SAR成像系统中,为了得到高分辨率成像,方位向使用多通道接收技术,会带来非均匀采样问题。该文详细分析了非均匀采样SAR信号的频谱模糊,利用周期性时间偏移频谱重构方法重建信号频谱;依据多通道SAR信号与单通道SAR信号的不同与相关性,使用CS算法完成了多通道SAR信号的成像。仿真试验证明了理论分析的正确性。Nonuniform sample of SAR signal will add the noise into the signals,mix the spectrum of the echo signals with the spectrum of the noises,increase ambiguity of the signals,and depress the SAR imaging quality.In wide swath SAR systems,the multi-channel receivers are used in Azimuth for high resolution image,the nonuniform sampling will be meted.This paper carefully analyzes the spectrum ambiguity of the nonuniform sampling SAR signal and reconstructs unambiguous spectrum of the signal by periodic time offset spectrum reconstruction way;Based on the difference and correlation between the multi-channel signals and single channel signal,we have finished the multi-channel SAR imaging by CS algorithm,the simulation results prove the correctness of theoretic analysis.

关 键 词：方位模糊 频谱重构 多通道 非均匀采样 宽幅合成孔径雷达 

分 类 号：TN957[电子电信—信号与信息处理]