Fast wideband beam-forming method of employing space-time two-dimensional filtering

Abstract

The invention belongs to the field of underwater acoustic sensor array signal processing and particularly relates to a fast wideband beam-forming method of employing space-time two-dimensional filtering. The method comprises the following steps of carrying out sampling at a sampling rate in accordance with a Niquest theorem, arranging data collected by each channel into a column vector in a chronological order to form a T*N-dimensional data matrix, wherein the column numbers are j=0, 1, ..., N-1 in sequence, and the row numbers are i=0, 1, ..., T-1 in sequence; determining a sampling multipleM and an adjacent channel delay compensation point T0; and computing a principal value interval P<(0)>(T0) of a coordinate matrix, specifying the column numbers of the coordinate matrix as j=0, 1, ..., N-1 from left to right in sequence and the row numbers as i=0,1, ..., M-1 from top to bottom in sequence and determining an element, in the ith row and jth column, of P<(0)>(T0) as the formula shownin the specification. The invention provides a coordinate matrix computation method, valid data are directly computed by using the coordinate matrix and most redundant computations are omitted, thereby achieving the target of fast computation.

Description

technical field [0001] The invention belongs to the field of underwater acoustic sensor array signal processing, and in particular relates to a fast broadband beam forming method of space-time two-dimensional filtering. Background technique [0002] In underwater passive positioning, the target sound source is often a broadband sound signal. Fast and accurate broadband beamforming technology is of great significance to improve the performance of underwater weapons and equipment. [0003] Conventional broadband digital beamforming is based on quantized time delay, so parameters such as the scanning range and angle step value of the output beam are limited by the sampling rate. In order to ensure the quality of the output beam, a higher sampling rate is often required. When the receiving array is a standard half-wavelength uniform linear array, The process of broadband time-domain beamforming is described. Among them, N means that there are N array elements in the linear ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that upsampling results in doubled calculation, the present invention proposes a fast broadband time-delay beamforming method based on space-time two-dimensional filtering

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