Abstract
As a single-step method, the direct position determination (DPD) algorithm uses combined data from all available receivers to locate the emitter, and is known to perform better than the conventional two-step methods especially in low signal-to-noise situation. However, it is challenging to make it applied in multi-target case in passive radar systems, while the localization of emitters transmitting unknown linear frequency modulation (LFM) signals is unavoidable in realistic scenarios. Hence, a fast and effective method based on the DPD algorithm and Fractional Fourier transform (FRFT) is introduced. Due to the utilization of FRFT and some basic classification algorithm, the number of emitters is determined, meanwhile the position and signal parameters of each emitter can be jointly estimated by a four-dimensional grid search. Simulation results show that the proposed algorithm outperforms the DPD method which ignores the transmitted signals.
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