LFMCW SAR非线性校正成像方法研究  

Research on Nonlinearity Correction Imaging Method of LFMCW SAR

作　　者：曲长文[1] 王颖[1,2] 苏峰[1] 陈波涛[2] 

机构地区：[1]海军航空工程学院404教研室,山东烟台264001 [2]中国人民解放军63891部队,河南洛阳471003

出　　处：《中国电子科学研究院学报》2009年第1期50-53,共4页Journal of China Academy of Electronics and Information Technology

基　　金：中国博士后科学基金(2005037772)

摘　　要：线性调频连续波合成孔径雷达(LFMCW SAR)是一种新近提出来的成像雷达体制,它结合调频连续波与合成孔径成像技术,具有体积小、重量轻、成本低、分辨率高等一系列优点。然而,由于受系统的影响,调频信号的频率和时间并不完全满足线性关系。在详细分析了LFMCW的调频非线性对距离分辨率及FMCW SAR成像质量的影响之后,提出使用分段线性拟合的方法估计调频信号的非线性,并提出了非线性的校正方法,研究了存在非线性时的FMCW SAR成像算法,并给出了仿真结果,验证了该方法的有效性。The linear frequency modulated continuous wave synthetic aperture radar （FMCW SAR）is a newly proposed radar imaging system, which combines FMCW technique with synthetic aperture imaging methods. It has many advantages of being small in size, light in weight, cost-effective and with high-resolution. In practical SAR system, however, the frequency and time of the frequency modulated signal cannot keep absolute linearity. The effects of nonlinear frequency modulation on range resolution and FMCW SAR imaging are analyzed. A method of subsection fitting a straight line is proposed to estimate the nonlinearity of the frequency modulated signal, and the correct method of nonlinearity is presented. Nonlinear FMCW SAR imaging algorithm is studied and simulation results are presented, which show that the method is valid.

关 键 词：线性调频连续波 合成孔径雷达 线性度 非线性校正 距离分辨率 

分 类 号：TN958[电子电信—信号与信息处理]