Single-observer multi-illuminators passive location using TDOA and fdoa measurements

In order to locate a moving target with a single observer receiving signals from multiple illuminators, with the time differences of arrival (TDOAs) and frequency differences of arrival (FDOAs) between direct signals and target echoes as measurements, a loctation method based on Taylor iteration was proposed, and Taylor iterative was used to estimate the target position and velocity in the method. The initial iteration value was given by a least squares (LS) algorithm. The Cramer-Rao lower bound (CRLB) and the theoretical error of the proposed algorithm were also derived. Simulation results showed that the proposed algorithm needed merely one iteration to converge to the global optimal solution. The CRLB of jointing TDOA and FDOA location system was lower than that of the TDOA-only and FDOA-only system. Moreover, the proposed algorithm achieved the CRLB at moderate noise level before the threshold effect occurred. The geometric dilution of precision (GDOP) figure showed that target position and illuminator position were also important factors affecting the localization accuracy. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved.