一种联合式射频窄带信号时差估计方法
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摘要
针对无源时差定位技术中的射频窄带信号时差估计,提出了一种基于离散小波变换、广义互相关、聚类分析的联合式射频窄带信号时差估计方法。本方法首先是以监测数据离散小波变换的低频系数为输入,基于广义互相关时延估计方法,提取射频窄带信号时差的估计初值;再以对多时段的时差估计初值为输入,通过聚类分析,得到空间射频窄带信号的时差估计终值。仿真表明:本文提出的方法具有良好的估计性能,射频窄带信号时差提取精度显著提高。
A time delay estimation( TDE) method for narrow-band RF signals is proposed,which has potentials in passive localization applications. It is a multi-stage scheme,which is initialized by calculating the discrete wavelet transform( DWT) coefficients of the measurements corresponding to the low frequencies,followed by estimating the TDE with the generalized cross-correlation( GCC) algorithm,and is finalized by clustering the results. Simulations have demonstrated its superior performance compared with the classic methods.
A time delay estimation( TDE) method for narrow-band RF signals is proposed,which has potentials in passive localization applications. It is a multi-stage scheme,which is initialized by calculating the discrete wavelet transform( DWT) coefficients of the measurements corresponding to the low frequencies,followed by estimating the TDE with the generalized cross-correlation( GCC) algorithm,and is finalized by clustering the results. Simulations have demonstrated its superior performance compared with the classic methods.
引文
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[2]胡来招.无源定位[M].北京:国防工业出版社,2004.
[3]陈明福,戴琳琳.无源定位系统在航管中的应用[J].现代雷达,2011(07):32-36
[4]郑志娟,刘建.多站时差定位技术提升野战机场航管与空情监视能力[J].舰船电子对抗,2011(04):9-13
[5]Glenn Goodman,Lethal SEAD.US navy and US air force pursue different paths to counter SAW threats[J].The Journal o f Electronic Defense,2009,32(4):26-34.
[6]Friedlander B.On the Cramer-Rao bound for time delay and Doppler estimation[J].IEEE Transactions On Information Theory,1984,30(3):575-580.
[7]Zeira A,Schultheiss P M.Realizable lower bounds for time delay estimation[J].IEEE Transactions On Signal Processing,1993,41(11):3102-3113.
[8]Kapp C H,Cater G C.The generalized correlation method for estimation of time delay[J].IEEE Transactions on Acoustics,Speech,and Signal Processing,1976,24(4):320-327.
[9]杨福生.小波变换的工程分析与应用[M].北京科学出版社,1999.
[10]胡昌华,张军波,夏军等.基于MATLAB的系统分析与设计-小波分析[M].西安电子科技大学出版社,2000.
[11]Castleman K G著,朱志刚等译.数字图像处理[M].电子工业出版社,1998(第一版):261-304.
[12]Dunhm M H著,郭崇慧等译.数据挖掘教程[M].清华大学出版社,2005.
[13]Mitchell T M著,曾华军等译.机器学习[M].机械工业出版社,2015.