一种关于LFM相参脉冲信号多普勒频率变化率的估计算法  

An Estimation Algorithm for Doppler Frequency Rate-of-Change with LFM Coherent Pulse Signal

作　　者：郁春来[1] 万方[2] 占荣辉[1] 万建伟[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073 [2]空军雷达学院研究生管理大队,湖北武汉430019

出　　处：《信号处理》2008年第4期546-550,共5页Journal of Signal Processing

摘　　要：LFM信号在雷达和通信中得到广泛应用,对于单站无源定位与跟踪系统来说,获取LFM信号中多普勒频率变化率信息具有十分重要的现实意义。接收信号的多普勒频率变化率十分微弱,很难精确测量。本文提出了基于渐近小波变换的多普勒频率变化率估计算法,通过对LFM信号的渐近小波变换谱做相关,增强了多普勒频率变化率信息,消除了调频率对参数估计的影响。数值仿真表明参数估计的精度接近CRLB,能达到单站无源定位与跟踪系统的精度要求。LFM signal has been widely applied in radar and communication. In the passive locating and tracking system of single observer, obtaining the Doppler frequency rate-of-change information has important practical significance. The Doppler frequency rate-of- change of received signal is very difficult to estimate accurately because of its subtleness. In this paper, an algorithm is proposed to estimate the Doppler frequency rate-of-change based on asymptotic wavelet transform. The Doppler frequency rate-of-change is enhanced and the influence of parameter estimation is eliminated because of ratio of modulation by the asymptotic wavelet transform spectral correlation. The numerical simulations show that the precision of parameter estimation approach the CRLB, and meet the needs for passive locating and tracking system of single observer.

关 键 词：单站无源定位与跟踪 LFM相参脉冲信号 多普勒频率变化率 渐近小波变换 

分 类 号：TN958[电子电信—信号与信息处理] TP273.2[电子电信—信息与通信工程]