Abstract. For passive localization of wideband signal sources, a points imaging passive localization algorithm is proposed with the information of time difference of arrival(TDOA) and frequency difference of arrival(FDOA). This method uses the principle of Synthetic Aperature Radar(SAR) imaging and the idea of direct position determination(DPD) for reference. The observing time is divided into fast time and slow time in sampling. On the basic of analyzing range difference of arrival(RDOA) walking in the parallel track and squint mode, the RDOA walking is corrected in fast time, and the FDOA spatial variation is compressed. Then joint TDOA and FDOA are estimated and mapped to the position of target. The results of simulation prove the effectiveness of the proposed algorithm. The proposed algorithm is especially applicable for the observing unresolved multiple targets localization with properties of high precision and super resolution.
Abstract. The technology of combining single pulse active location with passive location, the question of accomplishing accurate target location as well as avoiding the problem that active detection signals are easy to be intercepted and identified need more research. The location performance and error distribution features of passive detection of remote target are analyzed in the issue at first. Then the location performance and error distribution features of single pulse active detection is put forward. In the end, the location system of single pulse active location cooperate with passive location is proposed. At the same time, the maximum likelihood estimation location result of the system is deduced and the location performance is analyzed. With the theoretical analysis and simulation approach proposed, single pulse active location system have high radial location accuracy, and the passive location system have high tangential location accuracy. Comprehensive location can have high radial location accuracy as well as high tangential location accuracy.
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