基于模糊函数切片和FrFT的快速LFM信号参数估计  

Fast Parameter Estimation Method for LFM Signal Based on Ambiguity Function Slice and FrFT

作　　者：朱延万[1] 赵拥军[1] 贾伍刚 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002 [2]河南省陆军预备役高射炮兵师后勤部,河南郑州450000

出　　处：《信息工程大学学报》2012年第2期218-223,共6页Journal of Information Engineering University

摘　　要：RAT(Radon-Ambiguity Transform)和FrFT(Fractional Fourier Transform)被广泛应用于线性调频(LFM)信号的参数估计。针对RAT调频斜率估计时的全角度域搜索和FrFT参数估计时的两维搜索导致计算量增加的问题,提出了一种快速LFM信号参数估计方法。采用模糊函数(Ambiguity Function)切片和RAT相结合的方法快速估计调频斜率,并以此确定最优分数阶变换阶数,然后利用一次FrFT实现LFM信号的剩余参数估计。理论分析和实验仿真表明了该方法的有效性。Radon-Ambiguity Transform and Fractional Fourier Transform are widely used for parameter estimation of LFM signal.In order to reduce the amount of computation,aroused by full field of angle searching in chirp rate estimation based on RAT and two dimensional searching in parameter estimation based on FrFT,a fast method for parameter estimation of LFM Signal is proposed in this paper.The best fractional is calculated following the fast estimation of the chirp rate using Ambiguity Function slice and RAT.Then the other parameters of LFM are estimated by one time FrFT.Theoretical analysis and simulation results show its effectivity.

关 键 词：LFM信号 参数估计 RADON-AMBIGUITY变换 分数阶傅里叶 模糊函数切片 

分 类 号：TN911.7[电子电信—通信与信息系统]