Active sonar pulse signal direction finding method

Abstract

The invention provides an active sonar pulse signal direction finding method, which comprises the following steps of: performing square detection integration on pulse signals received by each hydrophone of a right-angle ternary array to obtain a signal envelope, and performing envelope leading edge detection; after the leading edge is detected, starting a width discriminator, carrying out FFT analysis on data within the first 1 / 5 pulse width, and estimating the signal frequency f; from 1 / 5 pulse width to 4 / 5 pulse width, storing data for calculating the phase difference; and adding the time delay correction value to the time delay rough measurement value to obtain a time delay accurate measurement value. According to the two time delay accurate measurement values of the first path and the second path and the third path and the second path, the direction of the pulse signal can be calculated by adopting a time delay estimation method, the limitation that the array spacing must be smaller than the half wavelength can be eliminated, target cooperation is not needed, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic signal processing, and in particular relates to an active sonar pulse signal direction finding method. Background technique [0002] The monitoring of active sonar signals plays an important role in underwater weapons, underwater acoustic reconnaissance and marine scientific research. Active sonar transmits pulsed signals covering a large bandwidth, from a few kHz to hundreds of kHz. In such a wide frequency range, there is no way to arrange hydrophone arrays at half-wavelength intervals like conventional directional positioning technology. When the distance between array elements is greater than half-wavelength, the time delay difference between the two elements receiving signals is often much greater than the signal period. When the phase ambiguity occurs, it will lead to serious direction finding ambiguity. Contents of the invention [0003] In view of this, the purpose of the p...

AI Technical Summary

Problems solved by technology

In such a wide frequency range, there is no way to arrange hydrophone arrays at half-wavelength intervals like conventional directional positioning technology. When the distance between array elements is greater than half-wavelength, the time delay difference between the two elements receiving signals is often much greater than the signal period. phase ambiguity, which in turn leads to severe DF ambiguity

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