Efficient DOA estimation algorithm with robustness and high resolution

Abstract

The invention discloses an efficient DOA estimation algorithm with robustness and high resolution. On the basis of the traditional symmetric compression MUSIC algorithm principle, the algorithm jointly processes sound pressure and vibration velocity in the signal processing procedure; and the specific method comprises the following steps: synthesizing two vibration velocities collected by a vectorhydrophone, and then performing cross-correlation processing with the sound pressure information, thereby obtaining a covariance matrix; reducing the three-dimensional guidance vector to one dimension, wherein the processing plays the dimension reduction effect, so that the processing can be applied to the vector hydrophone; constructing an energy spectrum function by combining the energy thoughtand according to the feature that the energy produces the wave crest at a sound source location, and optimizing the symmetric compression MUSIC by using the energy spectrum. Through the algorithm disclosed by the invention, on the one hand, the calculated quantity of the covariance matrix decomposition can be reduced, the isotropy noise is removed, and the pressure of hardware for the data storage, the data computation and transmission can be effectively relieved; and on the other hand, the optimization processing is performed by utilizing the energy spectrum, thereby reaching effects of improving the robustness and improving the device accuracy.

Description

technical field [0001] The invention belongs to the field of array signal processing, and relates to a spatial sound source angle of arrival (direction of arrival, DOA) estimation method, in particular to a half-spectrum search class MUSIC (Multiple Signal Classification, multiple subspace classification) estimation based on a vector hydrophone method. Background technique [0002] With the changes of the times, the exploration of the ocean has become an irreversible trend, and countries must increase their investment in ocean research. Sound waves are an essential part of ocean exploration, and among the various forms of energy known so far, the most stable and continuous energy can be transmitted in the ocean environment. As an important branch of signal information processing, array signal processing has been widely used in radar, exploration, sonar, etc. Its essence is to use the array elements arranged in a certain shape to collect the time domain information or air do...

AI Technical Summary

Problems solved by technology

Mainly include the following: 1. The robustness of the algorithm is poor, 2. The calculation amount of the algorithm is huge, 3. The dependence on the array structure is strong

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