A Residual Frequency Offset Estimation Method Based on Range Migration Fitting  

作　　者：Liting Zhang Hao Huan Ran Tao Xiaogang Tang 

机构地区：[1]School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China [2]School of Aerospace Information,Space Engineering University,Beijing 102206,China

出　　处：《Journal of Beijing Institute of Technology》2024年第2期103-110,共8页北京理工大学学报（英文版）

基　　金：supported in part by the National Natural Foundation of China(No.62027801).

摘　　要：Recently,researchers have proposed an emitter localization method based on passive synthetic aperture.However,the unknown residual frequency offset(RFO)between the transmit-ter and the receiver causes the received Doppler signal to shift,which affects the localization accu-racy.To solve this issue,this paper proposes a RFO estimation method based on range migration fitting.Due to the high frequency modulation slope of the linear frequency modulation(LFM)-mod-ulation radar signal,it is not affected by RFO in range compression.Therefore,the azimuth time can be estimated by fitting the peak value position of the pulse compression in range direction.Then,the matched filters are designed under different RFOs.When the zero-Doppler time obtained by the matched filters is consistent with the estimated azimuth time,the given RFO is the real RFO between the transceivers.The simulation results show that the estimation error of azimuth distance does not exceed 20 m when the received signal duration is not less than 3 s,the pulse repe-tition frequency(PRF)of the transmitter radar signal is not less than 1 kHz,the range detection is not larger than 1000 km,and the signal noise ratio(SNR)is not less than-5 dB.

关 键 词：range migration fitting(RMF) passive localization residual frequency offset(RFO) 

分 类 号：TN911.7[电子电信—通信与信息系统]