Co-prime array wave arriving direction estimation method based on virtual array covariance matrix sparse reconstruction
A technology of direction of arrival estimation and covariance matrix, which is applied in the field of signal processing and can solve the problems of increased computational complexity and hardware complexity of the system, and inability to perform DOA estimation.
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[0093] Simulation example 1: The first type of coprime array is used to receive the incident signal, and its parameters are selected as M=3, N=5, that is, the coprime array of the structure includes Q=M+N-1=7 physical antenna array elements. Assume that the number of incident narrowband signals is 7, and the incident direction is evenly distributed in the spatial angle range of -60° to 60°; the angle domain range of the direction of arrival angle is [-90°,90°], the spatial domain grid The point uniform sampling interval is set to 0.1°; the regularization parameter ξ is set to 0.25; the signal-to-noise ratio is set to 0dB, and the number of sampling snapshots K=500.
[0094] The spatial power spectrum of the coprime array direction of arrival estimation method based on sparse reconstruction of the virtual array covariance matrix proposed by the present invention is as follows Image 6 As shown, the vertical dashed line represents the actual direction of the incident signal source. ...
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[0095] Simulation example 2: The second type of coprime array is used to receive the incident signal, and the parameters are selected as M=3, N=5, that is, the coprime array of the architecture includes Q=2M+N-1=10 physical antenna elements; Assuming that the number of incident narrowband signals is 15, the other parameter settings are consistent with the simulation example 1. At this time, the number of consecutive virtual array elements on the virtual array is L=35, correspondingly, L v =17. by Figure 7 It can be seen from the space power spectrum shown that the method proposed in the present invention can effectively distinguish the direction of arrival and angle information of 15 incident signal sources by using only 10 physical antenna elements, which embodies the advantages in degree of freedom performance.
[0096] In summary, the method provided by the present invention can realize effective estimation of the incident signal when the number of signal sources is greater ...
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