Dolphin bionic active pulse signal modeling method

Abstract

The invention relates to a dolphin bionic active pulse signal modeling method. The method comprises the following steps: 1, selecting pulse seed signals, i.e., according to a task target, selecting one or more pulses from single frequency, linear frequency modulation, hyperbolic linear frequency modulation and Rayleigh pulses as component seed signals; 2, determining a component quantity and frequency spectrum distribution of bionic signals, wherein there can be components in any quantities, two to three components are taken for the sake of simplicity, in terms of energy distribution of spectra, whether target detection focuses on a low-frequency portion or a high-frequency portion is mainly considered, and proper weights are given; 3, performing linear superposition after each component is delayed and weighed; and 4, enveloping a superposition result through a Gaussian mode. According to the invention, output spectrum distribution of synthetic signals can be obtained through adjusting weight coefficients and time delays, a certain adaptive mechanism is employed so that optimal detection waveforms can be obtained, and the defect of variation of detection performance due to restrictions of environment and targets under a conventional fixed detection mode can be effectively improved.

Description

technical field [0001] The invention relates to a modeling method for imitating a dolphin active pulse signal. Background technique [0002] Dolphin (Bottlenose Dolphin) is a kind of toothed whale suborder Dolphinidae, it is one of the most widely distributed in the ocean, human research and understanding. After millions of years of natural selection and evolution, the sonar system of dolphins has excellent target and environmental perception capabilities and anti-interference capabilities. Through the click signal (click) issued by the sonar system, they can complete various complex tasks such as identification, positioning, navigation, obstacle avoidance, hunting and avoiding natural enemies of individual populations. [0003] When current sonar systems detect targets, they mainly use pulse signals such as single frequency and frequency modulation, and adopt fixed detection modes, which are difficult to adapt to the continuous changes of the underwater environment and tar...

AI Technical Summary

Problems solved by technology

[0003] The current sonar system mainly uses pulse signals such as single frequency and frequency modulation when detecting targets, and adopts a fixed detection mode, which is difficult to adapt to the continuous changes of the underwater environment and targets.

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