Research On Target Detection Algorithm And Simulation Of Airborne Distributed MIMO Radar

With the rapid development of science and technology,airborne radar is faced with many challenges while its status in military field is improving Modern military operations require not only high precision target detection capability and long-range detection range of airborne radar,but also new high requirements in anti-jamming,stealth operations and flexible operations.The airborne distributed MIMO radar combines the advantages of many radar systems and has great combat potential in the future battlefield.This thesis focuses on the algorithm of target detection and clutter suppression for airborne distributed MIMO radar system,it mainly includes distributed MIMO radar signal model,distributed clutter modeling,distributed MIMO radar signal processing,space-time adaptive processing and clutter suppression.The main research contents of this thesis are as follows:1.Research on basic theory of airborne distributed MIMO radar.First,the basic model of airborne array antenna signal is introduced,then the signal receiving model at element level is deduced,and then the ECHO signal model of airborne phased array and MIMO is introduced,in this thesis,the single-transmit waveform and multi-transmit waveform in distributed MIMO radar are introduced.2.Study on clutter modeling of airborne distributed MIMO radar.Firstly,the basic theory of radar clutter is introduced,and then a clutter scattering coefficient model based on digital elevation data is proposed to realize the fine modeling of airborne clutter.Then,according to the source of the received signal,the clutter is divided into two types: singlebase clutter and bistatic clutter.Finally,the modeling process of distributed MIMO radar clutter is summarized.3.Research on signal processing of airborne distributed MIMO radar.Firstly,several non-adaptive processing algorithms for airborne distributed MIMO radar target detection are presented,including matched filtering,moving target detection and beamforming.Then the coherent and non-coherent signal processing modes of distributed MIMO radar are analyzed,and the non-coherent processing flow of distributed MIMO radar system is given.Four.The space-time adaptive processing and clutter suppression of airborne distributed MIMO radar are studied.Firstly,the STAP clutter suppression structure of airborne distributed MIMO radar is introduced.Then the single-base STAP algorithm is introduced.Then,based on the range nonstationarity of the clutter under bistatic radar,a bistatic reduced-dimension STAP algorithm is proposed.