Research Of Raw Signal Based Passive Localization For Multistatic Radar Systems

Emitter localization in the electronic warfare plays an important role in the increasingly complex electromagnetic environment,and the intensification of the electronic warfare requires better localization accuracy.The traditional technology of the target localization is not fit to the growing needs for the localization performance.The direct position determination method for raw signal,based on the large data,attracts much interest as a result of the high precision and good robustness.In the passive noncooperative scenario,the transmitted signal is unknown for receivers in general.As for this problem,the existing direct position determination methods of the emitter do not estimate the transmitted signal based on some prior information which is obtained in the radar reconnaissance or signal preprocessing to help improve localization performance but ignore the signal information.These cases should be researched deeply in the sense that the knowledge of waveform information can be utilized to help improve the localization performance.Therefore,in the passive localization,the research of the direct position determination technology is not enough and more realistic scenes should be considered.Based on the problem of emitter localization in the multiple base stations radar system,this paper studies the direct position determination method based on the waveform estimation of the transmitted signal.Some effective solutions and algorithms are provided.The main work contents are as follows:1.In the multiple base stations radar system,aiming at the emitter localization,the traditional algorithm for the processed signal based on arrival time difference and the direct position determination for the raw signal based on maximum likelihood estimation or least squares estimation are studied.Two methods are simulated and analyzed as well.2.As for the problem that the parameters of the transmitted signal are unknown for receivers in non-cooperative scenario,a new direct position determination algorithm is proposed to jointly estimate the signal parameters and emitter position based on the short time Fourier transform.3.When the profile of the transmitted signal is unknown to receivers or the signal can not be parameterized,so as to improve the localization performance,a non parametric method is proposed to jointly estimate the signal waveform and emitter position based on principal component analysis.The performance of the direct position determination algorithms based on signal estimation is analyzed by Monte Carlo simulations.The results show that the algorithms proposed in this paper outperform the existing direct position determination algorithm in the same situation.