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      Passive Direct Location Determination for Multiple Sources Based on FRFT

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          Abstract

          The Direct Position Determination (DPD) method can fully use the information of an observed signal, and it is known to outperform the traditional two-step methods at a low Signal-to-Noise Ratio (SNR). To solve the problem of localizing multiple transmitters with unknown Linear Frequency Modulation (LFM) signals in multi-static passive radar systems, a multi-target positioning algorithm based on DPD algorithm and FRactional Fourier Transform (FRFT) is proposed. First, according to the established signal model, the theoretically optimal high-dimensional maximum likelihood estimator is deduced; Then, to address the high computational complexity of the estimator in jointly estimating high-dimensional signal parameters and positions of sources, we propose a dimensionality reduction strategy based on the FRFT and some basic classification algorithms to transform the multi-target localizing problem to a multiple single-target localizing problem. Through this method, the position and the corresponding signal parameters of each source can be efficiently estimated by a four-dimensional grid search. Simulation results show that the proposed method outperforms the existing DPD algorithm, and it can determine the positions of sources without directly utilizing the transmitted signal information.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 August 2018
          : 7
          : 4
          : 523-530
          Affiliations
          [1 ] (School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China)
          Article
          34b6e435d072427cbca0498fa714be1e
          10.12000/JR18027
          98d78652-9589-4297-9dc3-fae12eb9b557

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

          History
          Categories
          Technology (General)
          T1-995

          Remote sensing,Electrical engineering
          Direct Position Determination (DPD),Linear frequency modulation signals,FRactional Fourier Transform (FRFT)

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