Direct Positioning Maximum Likelihood Estimator Using Bistatic Stations TDOA and FDOA for Coherent short-pulse Emitter

The intra-pulse phase change caused by FDOA is so little, even omitted due to extremely short duration of radar pulses, that we can’t realize the joint location using TDOA and FDOA of signals received by bistatic stations. Aimed at the above-mentioned problem, a multi-pulse coherent accumulation algorithm of direct position determination using TDOA and FDOA is proposed by phase compensation among pulses. Consider the case that there are only two moving receivers used to estimate the position of emitter. Through establishing coherent signal model of short pulses which is deterministic but unknown, the maximum likelihood estimator is derived by taking the DPD approach under additive Gaussian white noise environment. In this wok, we also derive a signal-specific CRLB of DPD, modeling the signal as a deterministic unknown. Simulation results show that the accuracy of proposed method is close to CRLB in high signal-to-noise ratio (SNR). Simulation results show that location accuracy of the proposed algorithm can achieve the CRLB under the normal signal-to-noise ratio(SNR) and the performance is also very well in low SNR.