EXTRACTION OF NATURAL FREQUENCY FROM MEASURED LATE-TIME TRANSIENT RESPONSES WITH RATIONAL MINIMAX APPROXIMATION IN FREQUENCY DOMAIN

作     者：Jiao Dan Xu Shanjia Wu Xianliang 

作者单位：Dept.of Electronic Eng.& Information Sci.Univ.of Science & Technology of China Dept.of Electronic Eng.& Information Sci.Anhui University 

会议名称：《1998 International Conference on Microwave and Millimeter Wave Technology》

主办单位：Chinese Institute of Electronics (C1E);IEEE Beijing Centre;IEEE Beijing Section;The Korea Institute of Telematics and Electronics

会议日期：1998年

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 081105[工学-导航、制导与控制] 081001[工学-通信与信息系统] 081002[工学-信号与信息处理] 0825[工学-航空宇航科学与技术] 0811[工学-控制科学与工程] 

基　　金：Supported by the National Natural Science Foundation of China the Foundation of the Education Commission of Anhui Province 

关 键 词：transient response convergence of numerical methods minimax techniques poles and zeros radar theory Fourier transforms natural frequency extraction late-time transient responses rational minimax approximation frequency domain Fourier transform denominator polynomial optimum rational function conducting sphere convergence radar target identification 

摘      要：正A simple technique is presented for extracting natural frequencies from measured late-time transient *** method first applies rational mini-max approximation to the Fourier transform of the even extension of a transient response,then obtains natural frequencies directly from the zeros of the denominator polynomial of the optimum rational function. The effectiveness of the method is verified with a synthetic transient response and a measured response of a conducting *** results from the present method for the synthetic tfansient response are compared with those from constrained E-pulse technique （CET） and genetic algorithm technique（GAT）.It indicates that the present method avoids an initial guess,overcomes the tendency to get stuck in local minima and requires much less computer effort than the *** addition,unlike the GAT,it generally guarantees convergence and is insensitive to any parameter.