Least Square DOA Estimator Fast Algorithm by MIMO Sonar

A DOA(Direction of Arrival) estimator based on MIMO sonar system is proposed to estimate the DOA of targets.Firstly,orthogonal signals are sent out by transmitting sensors and the output of receiving sensors is processed by a matched filter using transmitting signals.Then,the solution of space fitting is achieved by least square method.Finally,perfect sampling,a kind of Markov Monte Carlo methods,is combined with least square method(PLS) to lighten the computation.Simulations show that in the case of two sources,the PLS provides similar performance to that achieved by the ML method and better performance than MVM method in low and mid SNR range,but its computational cost is much reduced comparing with that of ML.