龍俊波++汪海濱
摘 要: 線性調頻信號(LMFS)是雷達回波信號的一種常見形式,Wigner?Hough變換(WHT)常用于LMFS的檢測。復雜環(huán)境下雷達回波中的尖峰脈沖噪聲服從[α]穩(wěn)定分布,在這種噪聲環(huán)境下WHT性能退化。基于此提出了能工作在穩(wěn)定分布噪聲環(huán)境下的分數(shù)低階偽Wigner?Ville時頻分布方法(FLO?PWVD),結合已有的Hough變換,提出了分數(shù)低階偽Wigner?Hough變換(FLO?PWHT)新方法。在脈沖噪聲環(huán)境下,應用FLO?PWHT對多個LMFS信號進行檢測,計算機仿真結果表明,提出的FLO?PWHT算法性能明顯優(yōu)于已有的PWHT方法,能較好地在脈沖噪聲環(huán)境下工作,且具有一定的韌性。
關鍵詞: 雷達回波; 線性調頻信號; 時頻分布; [α]穩(wěn)定分布; 信號檢測
中圖分類號: TN911.7?34 文獻標識碼: A 文章編號: 1004?373X(2016)23?0005?04
FLO?WHT based radar echo LMFS detection in impulse noise
LONG Junbo1, WANG Haibin2
(1. School of Electronic Engineering, Jiujiang University, Jiujiang 332005, China;
2. School of Information Science and Technology, Jiujiang University, Jiujiang 332005, China)
Abstract: 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 distribution noise environment. The new method of fractional lower?order pseudo Wigner?Hough transform (FLO?PWHT) is proposed based on Hough transform. The FLO?PWHT method was adopted to detect the multiple LMFSs in impulse noise environment. 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.
Keywords: radar echo; linear frequency?modulated signal; time?frequency distribution; [α] stable distribution; signal detection