基于改进Radon-Wigner变换的目标和拖曳式诱饵频域分离  

The frequency-domain separation for the target and decoy based on the improved Radon-Wigner transform

作　　者：刘哲[1,2] 

机构地区：[1]北京航空航天大学,北京100191 [2]中北大学,太原030051

出　　处：《火控雷达技术》2016年第1期1-6,33,共7页Fire Control Radar Technology

摘　　要：针对拖曳式诱饵和目标的频率差异,提出了一种基于改进Radon-Wigner变换的目标和诱饵频域分离方法。首先分析了目标和诱饵的多普勒频差,其次,建立了目标和诱饵的回波信号模型。在此基础上,使用Radon-Wigner变换对回波模型进行参数估计。针对传统单一角度间隔的RadonWigner变换运算复杂度高的缺点,提出了改进Radon-Wigner变换算法。该算法通过大角度间隔的Radon变换,收缩角度搜索范围,而后以小角度间隔进行第二次Radon变换,并估计目标和诱饵的频域参数,实现目标和诱饵的分离。仿真结果表明,所提出的算法在准确估计目标和诱饵频域参数的同时,极大减少了运算量。According to the difference between frequencies of the towed radar active decoy and target,an improved Radon -Wigner transformation has been proposed to separate them in the frequency -domain.First,the frequency difference between target and decoy is analyzed.Then,the signal model,containing the target and decoy echoes, is constructed.The Radon -Wigner transform is adopted to extract parameters of the target and decoy from such a model.However,using single angle -interval,the conventional Radon -Wigner transform has the disadvantage of high computational complexity.To solve this problem,an improved Radon -Wigner transform is presented. Through the Radon transform with a large angle -interval,the searching range of the Radon angle can be narrowed.On this basis,the narrowed searching range and small angle -interval are used for second transform.By estimating the frequency -domain parameters,the target and decoy can be separated.The simulation results dem-onstrate that the proposed approach can not only estimate the frequency -domain parameters of the target and decoy accurately,but also significantly reduce the computational burden.

关 键 词：拖曳式诱饵 频域分离 Radon-Wigner 变换 单一角度间隔 RADON 变换 

分 类 号：TN973.3[电子电信—信号与信息处理]