To reduce the errors in detecting a target caused by the perturbed array shape, a simple pre-processing for a perturbed linear towed array is proposed. The proposed method linearizes a nonlinear phase of steering vector with position information measured by two reference sensors. It is based on the concept that a hydrophone's position may be decided by two adjacent hydrophones. Through the numerical experiments, the performance of the proposed method for the direction-of-arrival estimation was evaluated for various signal-to-noise ratio situations. The results showed that the proposed method estimated the characteristic of sources with more accuracy.
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