Research on position differential method of dual-satellites TDOA and FDOA in passive location system

Combining with the principle of dual-satellite TDOA and FDOA in passive location system, a position differential method basing on dual-satellite TDOA and FDOA in passive location is put forward, which derives solution position of known and unknown radiation source by using conventional location algorithm method of TDOA and FDOA location, then position correction is achieved by subtracting the exact position and solution position of known radiation source to correct the solution position of unknown radiation source. Simulation results show that, according to similar Geometric Dilution of Precision(GDOP) principle, the known and unknown radiation source at a distance of several hundred kilometers are selected for differential, which can greatly improve location precision. This method develop positioning system of dual-satellite TDOA and FDOA, which has important value for improving its availability and the reliability of positioning result.