Research On Signal Detection Related Technology For MIMO Radar With Distributed Antennas

MIMO(Multiple Input Multiple Output)technology has been widely used in communications,which uses multiple antenna arrays to resist multipath effects,inspired by this,Eran Fishler combined MIMO with radar technology,and put forward the concept of MIMO radar.At present,there are two kinds of MIMO radars: one is the centralized MIMO radar,which is the extension of phased array in the multi-antenna field,which has much in common with the traditional phased array.The other is the distributed MIMO radar with distributed placement of antenna elements,it absorbs the characteristics of MIMO communication better,whose antenna array space is fully separated,which can use the space diversity gain to resist the target RCS flicker,and improve the system performance effectively.This kind of MIMO radar is also the research focus of this paper.This paper mainly focuses on the distributed MIMO radar system,and studys the signal detection related technologies.The main work of this paper is as follows:Firstly,the background and significance of MIMO radar are briefly introduced and the research status of MIMO radar at home and abroad is introduced,including signal model,waveform design,parameter estimation,signal detection and so on.Then the basic principles of MIMO radar,such as target undulation model,characteristics and key technologies of MIMO radar are described,in addition,the signal models of centralized MIMO radar,short baseline distributed MIMO(SDMIMO)radar and long baseline distributed MIMO(LDMIMO)radar are established.Then the basic principle of target detection is introduced briefly,including N-P detector,binary detection model,detector performance index and so on,The N-P detector of phased array,SDMIMO and LDMIMO radar are derived for an ideal environment where only independent noise exists in the receiver,The detection performance of SDMIMO and LDMIMO radar are compared,meanwhile SDMIMO radar and phased array radar.Then the N-P detector of SDMIMO and phased array radar is derived and analyzed for non-ideal environments.The clutter is modeled as compound Gaussian clutter model when there are internal noise and external clutter both exist,and the anti-noise and anti-clutter capability of phased array and SDMIMO radar are compared.When the RCS scattering coefficient is not completely independent(partial correlation),the detection statistics for the presence of a target are approximated by gamma distribution,compared with the detection performance curve obtained by ignoring scattering coefficient and the actual performance curve obtained by Monte Carlo experiment,the rationality of this method is verified.Finally,in the case of unknown clutter power,two CFAR detectors——cell average constant false alarm detector and ordered statistic constant false alarm detector of phased array,short baseline distributed MIMO radar and long baseline distributed MIMO radar are derived and analyzed.And the detection performance of LDMIMO,SDMIMO and phased array radar are compared with each other according to the two detectors.