脉冲噪声下基于FLO-WHT的雷达回波LMFS检测  

FLO-WHT based radar echo LMFS detection in impulse noise

作　　者：龙俊波[1] 汪海滨[2] 

机构地区：[1]九江学院电子工程学院,江西九江332005 [2]九江学院信息科学与技术学院,江西九江332005

出　　处：《现代电子技术》2016年第23期5-8,12,共5页Modern Electronics Technique

基　　金：国家自然科学基金(61261046);江西省自然科学基金(20142BAB207006);江西省教育厅青年科技基金资助项目(GJJ14739);九江学院科技项目(2013KJ01;2013KJ02)

摘　　要：线性调频信号(LMFS)是雷达回波信号的一种常见形式,Wigner-Hough变换(WHT)常用于LMFS的检测。复杂环境下雷达回波中的尖峰脉冲噪声服从α稳定分布,在这种噪声环境下WHT性能退化。基于此提出了能工作在稳定分布噪声环境下的分数低阶伪Wigner-Ville时频分布方法(FLO-PWVD),结合已有的Hough变换,提出了分数低阶伪Wigner-Hough变换(FLO-PWHT)新方法。在脉冲噪声环境下,应用FLO-PWHT对多个LMFS信号进行检测,计算机仿真结果表明,提出的FLO-PWHT算法性能明显优于已有的PWHT方法,能较好地在脉冲噪声环境下工作,且具有一定的韧性。The linear frequency-modulation signal （LMFS） is a common form of radar echo signal, and the Wigner-Hough transform （WHT） is commonly used to detect the LMFS. The spike impulse noise in radar echo follows α stable distribution in complex environment, but the performance of the WHT will degenerate in this noise environment. The fractional lower-order pseudo Wigner-Ville time-frequency distribution （FLO-PWVD） method is proposed in this paper, which can work in stable dis- tribution noise environment. The new method of fractional lower-order pseudo Wigner-Hough transform （FLO-PWHT） is pro- posed based on Hough transform. The FLO-PWHT method was adopted to detect the multiple LMFSs in impulse noise environ- ment. The computer simulation results show that the proposed FLO-PWHT method has better performance than the existing PWHT method, it can work better in the impulse noise environment, and has a certain tenacity.

关 键 词：雷达回波 线性调频信号 时频分布 Α稳定分布 信号检测 

分 类 号：TN911.7[电子电信—通信与信息系统]