High Precision Passive Location Technology Based On Distributed Platform

In recent years,distributed passive location technology has attracted extensive attention be-cause of its unique silence,concealment and strong anti reconnaissance.One of the emerg-ing technologies is direct localisation,which avoids the estimation process of parameters in traditional two-step localisation techniques,greatly reducing information loss and thus of-fering higher localisation accuracy than traditional two-step localisation techniques.In this paper,the direct location technology in distributed passive location technology is studied.The main work includes:1.The basic theory of traditional distributed passive location technology is introduced.A basic array signal reception model is established and traditional two-step localisation-related algorithms such as the MUSIC algorithm,the Chan algorithm and the Taylor level expan-sion algorithm are briefly introduced.The MLE-DPD,MVDR-DPD and MUSIC-DPD al-gorithms are introduced in detail,as well as the basic principles of compressed sensing,and the performance of the three traditional direct localization algorithms is compared through simulation experiments.2.The classical super-resolution distributed passive direct localization technique is studied.The distributed array signal reception models in the context of weak time synchronization and strong time synchronization are established respectively,the SDF algorithm,CR-CS algorithm and GMA algorithm in the context of weak time synchronization are studied,and the shortcomings of the classical super-resolution distributed passive direct localization technique in processing coherent signals are discussed.The simulation demonstrates that the classical super-resolution direct localisation algorithm has better localisation accuracy and resolution than the traditional two-step directional localisation algorithm and the traditional MUSIC-DPD direct localisation algorithm,but does not have the ability to process coherent signals.3.The coherent signal super-resolution distributed passive direct localization technique is investigated.The conjugate reconstruction-SDF algorithm is studied,and two decoherent di-rect localisation algorithms in the context of weak time synchronisation are proposed,com-bining the spatially smooth decoherence and Toplitz reconstruction decoherence algorithms in the field of DOA estimation.Combining l₁-SVD and l₁-SRACV,two compression-aware algorithms that can handle coherent signals,the l₁-SRACV-DPD algorithm in the context of weak time synchronisation and the l₁-SVD-GDPD and l₁-SRACV-GDPD algorithms in the context of strong time synchronisation are proposed.The proposed algorithms are demon-strated to be capable of processing coherent signals with excellent positioning accuracy and resolution through simulation experiments.