吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 646-651.doi: 10.13229/j.cnki.jdxbgxb201602046

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Focusing method based on time reversal theory for far field targets

LIU Wei1, FU Yong-qing1, XU Da2   

  1. 1.College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001,China;
    2.College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2014-07-16 Online:2016-02-20 Published:2016-02-20

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Abstract:

A time reversal focusing method based on transfer matrix estimation is proposed for far field targets. In this method, first, the least square estimation of the transfer matrix is obtained using detection and reflection signals of the targets, based on which the time reversal operator (TRO) is calculated. Second, the eigenvalues and corresponding eigenvectors are obtained by performing eigenvalue decomposition of TRO, where the number of targets can be confirmed by the number of the principal eigenvalues. Finally, the far target focusing can be realized through calculating the objective function of virtual observed points in the search area using noise vectors. Experimental simulations are performed and results show that the proposed method could realize time reversal focusing for far field targets effectively and accurately. The focusing performance of this method is better than that of the selective focusing method based on decomposition of TRO.

Key words: information processing, far field targets focusing, time reversal, noise vectors

CLC Number: 

  • TN911.7
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