空时互质采样下栅格失配目标的频率和DOA联合估计

doi:10.11959/j.issn.1000-436x.2017035

Abstract

Abstract:

A method of joint frequency and direction of arrival (DOA) estimation using spatial-temporal co-prime sam-pling with off-grid sources was proposed to solve the problem of two-dimensional (2D) mismatches of signals.Firstly,the received signal was sampled by spatio-temporal co-prime sampling technique to construct 2D sparse reconstruction model with the filled coarray.Then the frequency mismatch term and angle mismatch term were incorporated into the re-ceived data model.Based on the above modified model,an improved greedy algorithm was presented to obtain the fre-quency mismatch and angle mismatch by estimating the spectrum leakage terms jointly.So the 2D off-grid sources can be corrected to accurate positions.The method can increase the degrees of freedom (DOF) in the space-frequency domain.Moreover,the method has reduced the amount of computation,and it can improve the frequency and DOA estimation accuracy in the meantime.Simulation results demonstrate the correctness and effectiveness of the proposed approach.

Key words: array signal processing, spatial-temporal co-prime sampling, direction-of-arrival (DOA) estimation, fre-quency estimation,grid mismatch

CLC Number:

TN911.7

Wang-han LYU,Hua-li WANG,Shan-xiang MU,Feng LIU. Joint frequency and DOA estimation using spatial-temporal co-prime sampling with off-grid sources[J]. Journal on Communications, 2017, 38(2): 125-131.

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