Phase Coded MIMO Radar Angle Measurement Accuracy Analysis And Experiment

MIMO radar is a radar system that uses multiple antennas to transmit mutually orthogonal signals and uses multiple receiving antennas to jointly process the echo signals.The receiver utilizes the transmitted signal's orthogonality to separate the transmitted signal in the echo signal via the matched filter and subsequently forms beams jointly through the DBF technique,which makes full use of the channel resources and greatly improves the detection and estimation performance of the radar.Array direction technology is a research hotspot of radar array signal processing.The main work of this paper is to research the array direction technology based on amplitude comparison and high resolution algorithm of angle measurement.Firstly,this paper leads into the two-phase coded MIMO system radar,and studies the design of the two-phase coded orthogonal waveform,m sequence.Furthermore,analyze the signal model of MIMO radar,signal processing of echo signal and combined beam of MIMO radar.Finally,the receiver and transmitter channel calibration techniques are studied,which provides a theoretical basis for the subsequent research on angle measurement of MIMO radar.Secondly,the principle of angle measurement with amplitude comparison is researched,and the accuracy of difference-sum-ratio algorithm in MIMO radar is deduced.In this paper,a lot of comparative analyses are done under the linear array model of one-sent-five-received and three-sent-five-received.Comparison and Simulation Analysis of Antenna Pattern Function,Angle Curve and Fitting Error are also analyzed.In this paper,the application of high resolution angle measurement algoritlhm in array angle measurement is studied.MUSIC algorithm,root-MUSIC algorithm and SSMUSIC algorithm is studied in turn,and the performance of angle measurement under different array element's number,array element spacing and snr is studied with a lot of simulation.Finally,in the engineering application,the new measurement radar of two-phase coded MIMO radar is studied.SNR of the echo signal is improved through matched filter.MTD compensates the Doppler shift between the pulses due to the speed and pulse accumulation,then DBF.After that the work is estimating the angle of the target with the amplitude comparison angle measurement algorithm and high resolution angle measurement algorithm,comparing and analyzing one-sent-five-received and three-sent-five-received angle results.