An Absolutely Asynchronous Radiation Emitter Location Method by Measuring TDOA

As the existing location methods based on TDOA can’t adapt to absolutely asynchronous arrival location problem of emitter signals, a new absolutely asynchronous radiation emitter location algorithm is proposed in this paper. Firstly every observing platform self-extracts the pulse pattern and its starting time of the emitter from the received pulse sequence respectively, and then the vice platforms transform the extracted pulse patterns and their starting times to the main platform. Finally, the main platform calculates the TDOA sequence (TDOAs) through the pulse pattern matching and extrapolating technique. This processing method solves the TDOA calculating difficulty problem brought by absolutely asynchronous radiation. The emitter position is estimated through the Newton iterative algorithm. The initial value of the Newton iterative algorithm is approximately obtained through calculating the intersection of two hyperbolas’ asymptotes formed by the average TDOA of the TDOAs. Simulation results verify the effectiveness and correctness of the proposed algorithm.