Passive localization method and its precision analysis based on TDOA and FDOA of fixed sensors

To solve the problem of time difference of arrival(TDOA) and frequency difference of arrival(FDOA) localization by fixed sensors,a new localization solution based on weighted least square and a tracking method based on extended Kalman filter are proposed.The geometric distribution of precision(GDOP) of localization Cramer-Rao lower bound(CRLB) is analyzed under the circumstances which some measurements errors exist in TDOA and FDOA parameters.The tracking performance of multiple-times measurements is simulated and is compared with performance using TDOA only.Simulation results show that adding FDOA information is useful to improve tracking precision of moving emitters.