Towed linear array sonar subarray error mismatching estimation method

Abstract

The invention discloses a towed linear array sonar subarray error mismatching estimation method, aims to realize reduction of the positioning error and can obtain the accurate orientation estimate andthe higher angle resolution. The method is characterized in that in an array manifold matrix model, a real full array manifold matrix is represented as linear combination of the displacement error amount of each subarray and the error amount of each subarray contributed to the full array manifold matrix; the position error between subarrays is introduced to a direction finding model, for a full array model with subarray displacement mismatching, the Bayesian rule is utilized to establish a data fusion model, a subarray position error vector and the target true azimuth are simultaneously solved, according to data collected by fused sensor nodes, the Bayesian algorithm is utilized to estimate the subarray displacement error and the direction of arrival to obtain the likelihood function of amulti-shot observation value; the azimuth estimate and the displacement error estimate of the root mean square error changing with the SNR are obtained through utilizing the posterior function.

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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