电波科学学报2016，Vol.31Issue(6)：1074-1080,7.DOI:10.13443/j.cjors.2016091601
基于Radon-Ambiguity变换的LFM信号时/频差快速联合估计
Joint time-frequency offset estimation for LFM signals based on the Radon-Ambiguity transform
摘要
Abstract
A fast method for joint estimation of the time-frequency offset for linear frequency modulated signals based on the Radon-Ambiguity transform (RAT) is proposed in this paper.According to peak positions of the RAT of a LFM signal on different angles,a set of equations with the time-frequency offset as the unknowns can be established and the time-frequency offset can be estimated by solving the equations.For signals disturbed by noise,errors of the RAT will cause the equations having no solutions.In order to eliminate the noise,the least square method is used to estimate the time-frequency offset.Because the proposed algorithm does not need to calculate the value of each point on the 2-D Ambiguity plane and the RAT for sampled signals can be realized rapidly by several processes of the fast Fourier transform,the proposed method has advantage of low computational cost.Simulation results show that the proposed algorithm can ensure the accuracy of the estimation of the time-frequency offset as well as is computationally efficient compared with common methods based on peak searching of the Ambiguity function.关键词
Radon-Ambiguity变换/最小二乘法/时/频差/线性调频信号Key words
Radon-Ambiguity transform/least square method/time-frequency offset/LFM分类
信息技术与安全科学引用本文复制引用
杨林森,张子敬,郭付阳..基于Radon-Ambiguity变换的LFM信号时/频差快速联合估计[J].电波科学学报,2016,31(6):1074-1080,7.基金项目
国家自然科学基金(No.61571349,No.61201325) （No.61571349,No.61201325）
国家留学基金 （）
