Method and device for concealed speed measurement of underwater moving target based on tick sound of sperm whale

Abstract

The present invention belongs to the field of underwater acoustic detection. On the basis of improvement of abilities of an active speed measurement device to camouflage and conceal, the speed measurement of an underwater moving target is realized. Therefore, the technical scheme of the invention is that: based on the method and device of concealment speed measurement of an underwater moving target based on ticking sounds emitted by a sperm whale, the device consists of a speed measurement demand analysis module, a signal generation module, a power amplifier module, a transducer, a hydrophone, a signal conditioning module and a data processing and display module, wherein the speed measurement demand analysis module receives practical application demand of speed measurement of the underwater moving target and selects and constructs appropriate combination of ticking sound pulses emitted by the sperm whale for speed measurement of the underwater moving target according to the application demand. The method and device of present invention is mainly applied to underwater acoustic detection.

Description

technical field [0001] The invention belongs to the field of underwater sound detection, in particular to a concealed speed measurement method and device for an underwater moving target based on the ticking sound of sperm whales. Background technique [0002] Velocity signal waveforms of traditional underwater moving targets (such as mines, submarines, and underwater glider), such as single-frequency rectangular pulse (Continuous Wave, CW), linear frequency modulation (Linear Frequency Modulation, LFM) pulse and other signals, have relatively simple and relatively Obvious characteristics of time domain, frequency domain and time-frequency domain, for example, their time domain envelope is rectangular or rectangular string, LFM signal waveform is similar to rectangular in frequency domain, CW pulse modulation signal is a single frequency signal, LFM pulse The frequency of the modulated signal changes linearly, etc. Therefore, they are easily intercepted, identified and locate...

AI Technical Summary

Problems solved by technology

[0002] Velocity signal waveforms of traditional underwater moving targets (such as mines, submarines, and underwater glider), such as single-frequency rectangular pulse (Continuous Wave, CW), linear frequency modulation (Linear Frequency Modulation, LFM) pulse and other signals, have relatively simple and relatively Obvious characteristics of time domain, frequency domain and time-frequency domain, for example, their time domain envelope is rectangular or rectangular string, LFM signal waveform is similar to rectangular in frequency domain, CW pulse modulation signal is a single frequency signal, LFM pulse The frequency of the modulation signal changes linearly, etc., so they are easily intercepted, identified and located by the enemy's reconnaissance system, thus posing a serious threat to the survivability of the speed measuring device

[0003] Sperm whales in the ocean are social animals (see Hal Whitehead and Linda Weilgart, Patterns of visually observable behavior and vocalizations in groups of female spermwhales[J], Behaviour, 118(3 / 4):275-296,1991), and they live underwater During the activity, different pulse signals will be continuously sent to the water; the time-domain envelope of these pulse signals changes randomly, without fixed rules, and the modulation signal in the envelope is a complex broadband signal, the signal is not stable, and the time-frequency characteristics are complex; Therefore, there is a clear difference from the conventional speed measuring pulse signal, and it is not easy to be recognized by the enemy as an active speed measuring pulse signal

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