基于CZT变换的StepTransform算法在脉冲压缩中的应用  

A Modified StepTransform Algorithm Based on CZT and Its Application to LFM Pulse Compression

作　　者：张大炜[1] 王岩飞[1] 詹学丽[1] 房丽丽[1] 

机构地区：[1]中国科学院电子学研究所

出　　处：《电子与信息学报》2008年第2期306-309,共4页Journal of Electronics & Information Technology

摘　　要：该文在分析传统StepTransform算法原理和不足的基础上,提出了一种基于CZT变换的StepTransform算法。针对传统StepTransform算法存在的处理数据量大和栅瓣高的现象,在方位向处理中采用了一次去斜代替阶梯去斜,并采用先对子孔径间的数据进行FFT分析细频,再利用CZT变换分析粗频的方法来抑制栅瓣和幅度调制现象的产生,从而得到线性调频回波Dechirp之后理想的脉冲压缩结果。理论推导和仿真验证的结果都表明了该算法的可行性和有效性。A new modified StepTransform algorithm based on CZT is provided in this paper in order to compensate for the insufficiencies of the traditional StepTransform algorithm. The order of the traditional StepTransform algorithm is changed by FFT for the fine resolution analysis on the first stage and CZT for the coarse resolution analysis on the second stage. The phenomenon of grating lobes and amplitude modulation is avoided and ideal LFM pulse compression result can be gotten in this new method. The validity and feasibility of the new algorithm is tested by the deduction of the formulation and simulation of the theory.

关 键 词：SAR StepTransform 子孔径 CZT变换 

分 类 号：TN957.51[电子电信—信号与信息处理]