Airspace rotation direction estimation method applied to uniform circular hydrophone array

Abstract

The invention discloses an airspace rotation direction estimation method applied to a uniform circular hydrophone array, and belongs to the technical field of sonar detection. The core technical content of the method is that a Heading angle provided by an azimuth attitude instrument is divided into two parts, a rough airspace rotation matrix and a fine airspace rotation matrix are respectively designed according to the angles of the two parts, and real-time rotation compensation is carried out on array data snapshot, so that target azimuth information in the array data snapshot is focused in the airspace. A covariance matrix constructed by utilizing the rotated data snapshot can be applied to a subspace type orientation estimation method to realize high-resolution orientation estimation ofa far-field target. According to the invention, the relative change of the target azimuth information in array data snapshot caused by the rotation motion of the uniform circular hydrophone array canbe compensated in real time, and the high-resolution azimuth estimation of the far-field target can be realized. The method can be better suitable for the working environment of the uniform circularhydrophone array, and has a certain practical guidance value.

Description

technical field [0001] The invention relates to an airspace rotation orientation estimation method applied to a uniform circular hydrophone array, and belongs to the technical field of sonar detection. Background technique [0002] The circular hydrophone array can provide omnidirectional and unambiguous azimuth information, and has approximately the same azimuth estimation accuracy and azimuth resolution ability in all directions, so it is widely used in the scene of underwater target azimuth estimation middle. Classical orientation estimation methods based on subspace theory, such as the Multiple Signal Classification (MUSIC) method, etc., the main idea is to use the covariance matrix to estimate the signal subspace and the noise subspace, and according to the positive relationship between the two subspaces High-resolution bearing estimation results can be obtained interactively. When the signal to noise ratio (Signal to Noise Ratio, SNR) of the target is low, accumulati...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for estimating the spatial rotation orientation of a uniform circular hydrophone array, to solve the problem that the circular array will inevitably rotate due to the influence of water flow during the acquisition time of a large amount of data snapshots. In turn, the target orientation information in the received data snapshots is relatively time-varying. At this time, a large number of array data snapshots cannot be used to estimate the covariance matrix, which leads to the failure of the orientation estimation method based on the subspace theory.

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