A Method for Estimating Error Mismatch of Sonar Subarrays of Trailed Line Arrays

Abstract

The invention discloses a method for estimating the error mismatch of a trailing line array sonar subarray, and provides an estimation method that can reduce the positioning error, obtain an accurate azimuth estimation value, and have a higher angular resolution. The following technical solutions are implemented: in the array manifold matrix model, the real full-array manifold matrix is ​​represented as a linear combination of the displacement error of each sub-array and the contribution of each sub-array error to the full-array manifold matrix; The position error between the subarrays is introduced into the direction finding model, and the Bayesian rule is used to establish a data fusion model for the full array model containing the displacement mismatch between the subarrays, and the position error vector of the subarrays and the true orientation of the target are solved simultaneously. The data collected by the node uses the Bayesian algorithm to estimate the displacement error and direction of arrival of the sub-array at the same time, and obtains the likelihood function of the multi-snap observation value; the posterior function is used to obtain the azimuth of the root mean square error with the signal-to-noise ratio. Estimates and displacement error estimates.

Description

technical field [0001] The invention relates to a sonar in which a hydrophone is embedded on a cable to form a line array, and the towed cable is dragged behind the stern of the ship to detect targets in the water. In particular, it relates to a method for estimating the displacement error and the direction of arrival of the sub-array at the same time when there is a sub-array displacement error when a sonar trailing line array performs passive synthetic aperture. Background technique [0002] A towed sonar is a sonar that drags a transducer array behind a carrier platform to detect side targets in the water. Tow line array sonar arrays are flexible. During the towing process, due to the influence of ship maneuvering and current, as well as its own vibration resonance, its formation is difficult to maintain stable, and formation distortion will make it difficult for towed array sonar to achieve theoretical performance. More serious in modern array processing methods. Beca...

AI Technical Summary

Problems solved by technology

despite a p (θ) Accurately known, the actual measured relative position vector of the subarray Generally not equal to the preset sub-array relative position vector r, so the real full-array manifold vector with the preset array manifold vector a w (θ) There will be a deviation between

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