Research On Joint Estimation Of Direction Of Arrival And Delay Of Radiation Source

As an important branch of signal processing,the estimation of array parameters plays an important role in the field of modern communication and military radar.Especially in recent years,with the rapid development of wireless communication technology,source localization becomes more and more important.Direction of Arrival(DOA)and delay are the two main parameters of source localization.Therefore,the accurate estimation of DOA and delay is the main research content of this paper.The joint angle and time delay estimation algorithms in two cases that the signal pre-sequence is known and unknown are studied in this paper.The main contents of this paper are as follows:The DOA estimation algorithms in array parameter estimation are investigated,including traditional MUSIC algorithm,ESPRIT algorithm,spatial smoothing algorithm,MUSIC algorithm based on Toeplitz matrix reconstruction for coherent signal processing,JADE-ESPRIT algorithm and TST-ESPRIT algorithm for joint angle and delay estimation.The joint estimation of DOA and delay when the signal pre-sequence is known is investigated,and a joint angle and time delay estimation algorithm based on matrix pencil is proposed.The proposed algorithm can separate the rays with a very close angle or delay,and can achieve good performance with few snapshots.The joint estimation of DOA and delay when the signal information is unknown is investigated,and a space-time two-dimensional parameter estimation method is proposed.The algorithm is suitable for any array structure with known formation,and it can estimate the delay less than sampling interval,which is not limited by the Rayleigh limit and has high estimation accuracy.