Dolphin bionic active pulse signal modeling method

A technology of pulse signal and modeling method, applied in the direction of radio wave measurement system, instrument, etc., can solve the problem that it is difficult to adapt to the continuous change of underwater environment and target, and achieve the effect of improving detection performance in limited environment and target change

Inactive Publication Date: 2017-02-15
HARBIN ENG UNIV
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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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  • Dolphin bionic active pulse signal modeling method
  • Dolphin bionic active pulse signal modeling method
  • Dolphin bionic active pulse signal modeling method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] The invention provides a modeling method for imitating dolphin active pulse signals, using conventional pulse signals as seed signals, superimposing multiple seed components together through weighting and delay, imitating the spectrum energy distribution of dolphin click signals, and creating a wide-band, short-term The multi-component imitation dolphin click signal with pulse width provides the emission signal for establishing the sonar system for imitation dolphin adaptive detection. The key points of the model include: (1) The dolphin-like active pulse signal is superimposed by multiple conventional pulse signals (CW, LFM, HFM, etc.) according to a certain weight and time delay. (2) The frequency band distribution is selected according to different detection targets and environments; (3) Due to the difference of the pulse seeds, the created imitation dolphin ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
CPCG01S7/52
Inventor 聂东虎青昕乔钢刘凇佐孙宗鑫周锋马帅张义
Owner HARBIN ENG UNIV
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