一种改进的Keystone变换算法及其在微弱信号检测中的应用  

An Improved Keystone Transform Algorithm for Dim Moving Target Detection

作　　者：王娟[1] 赵永波[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,西安710071

出　　处：《航空兵器》2011年第5期3-6,31,共5页Aero Weaponry

基　　金：航空科学基金资助项目(20090181007)

摘　　要：对传统的脉冲多普勒(PD)雷达,当相干积累时间较长时,回波往往会出现越距离单元走动,从而影响雷达探测目标的性能。Keystone变换是校正脉冲回波距离走动的常用方法。本文在运用Chirp-Z变换快速实现Keystone变换算法的基础上,提出一种改进的Keystone变换算法。所提算法具有更小的计算复杂度。计算机仿真和实测数据处理结果证明了该算法的有效性。Range migration often occurs when coherent accumulation time is long in conventional Pulsed Doppler （PD） radar. This will degrade the property of radar to detect dim moving targets. Key- stone transform is a commonly used method to correct range migration. On the basis of fast implementation of Keystone transform using Chirp-Z transform （CZT） , an improved algorithm is proposed in this paper, which has even lower complexity. Computer simulations and real data processing results are given to dem- onstrate the effectiveness of the proposed method.

关 键 词：PD雷达 越距离单元走动 KEYSTONE变换 Chirp—Z变换 

分 类 号：TN958.5[电子电信—信号与信息处理]