Active sonar frequency hopping signal generation method and device using sperm whale group sound

Abstract

The invention belongs to the field of signal detection and aims to improve the camouflaging and hiding capabilities of an active sonar sound source, reducing the probability that the active sonar sound source is captured, and enabling a transmitting signal to have excellent performance of approaching to a Costas hopping rectangular pulse signal. Therefore the technical scheme adopted by the invention is that a generation method and a generation device for an active sonar frequency hopping signal by using sound of a sperm whale herd are characterized in that the method comprises the following steps of firstly, defining an energy maximum frequency point of a pulse signal; secondly, a generation method for an active sonar Costas-Like frequency hopping signal: the following to the requirement of the application means that the transmitting sequence between pulse signal sequence groups is a continuous or alternated transmitting mode. The generation device for the active sonar frequency hopping signal by using the sound of the sperm whale herd comprises a command interface, a whale sound Costas code generator, a whale sound pulse sample library storage device, a whale sound amplification outputting device and a sounding sensor. The generation method and the generation device disclosed by the invention are mainly applied to the signal detection.

Description

technical field [0001] The invention belongs to the field of signal detection; specifically, it relates to a method and a device for generating active sonar frequency hopping signals utilizing the sound of sperm whale groups. technical background [0002] Conventional active sonar systems generally adopt the forms of sound source emission signals, such as single carrier frequency rectangular pulse signal, linear frequency modulation rectangular pulse signal, pseudo-random coded phase modulation rectangular pulse train signal, etc. The single-carrier frequency rectangular pulse signal is easy to generate and easy to process, but it cannot take into account both the distance rate and the speed resolution at the same time. The linear frequency modulated rectangular pulse signal can achieve pulse compression, which solves the contradiction between signal energy and distance resolution, but it still cannot provide joint high resolution due to the coupling relationship between its...

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Problems solved by technology

[0006] Explanation: Most of the cetaceans in the ocean are social animals (see literature [3-5]), they will continuously send out pulse signals during their activities, and the envelopes of these pulse signals change randomly without fixed rules , the modulation signal in the envelope is a complex broadband signal, the signal is non-stationary, and the time-frequency characteristics are complex; therefore, it is obviously different from the conventional active sonar signal, and it is not easy to be recognized as an active sonar signal

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