Navigation-body weak radiation noise signal detection method under marine environment

Abstract

A navigation-body weak radiation noise signal detection method under a marine environment relates to navigation-body radiation noise signal detection. Euler domain random resonance and Euler domain mixing random resonance models are established. A signal submerged by a strong background noise is processed in a stable state system of an Euler space. The signal is mapped to a period index form. A stable state model possesses a multi-resonant characteristic. Limitations of an approximation heat insulation theorem of a traditional random resonance theory and residence time are broken through, a radiation noise signal characteristic can be highlighted and a signal to noise ratio is increased. An Euler domain non-linear random resonance and mixing random resonance system is used to detect a period signal and a pulse signal radiated by an underwater navigation body. Underwater weak signal detection performance is improved and an output signal to noise ratio is effectively increased. A target signal is detected in a distance range which is greater than 500m. Under a co-existence condition of a low signal to noise ratio of minus 5dB and various kinds of other water sound interferences, existence of a target is detected. Sparse characteristic extraction and degradation treatment of a data amount are performed, and a calculating speed is increased.

Description

technical field [0001] The invention relates to detection of aircraft radiation noise signals, in particular to a method for detecting weak radiation noise signals of aircraft in marine environments. Background technique [0002] As a complex background noise field, the ocean is formed by sound waves generated by nature and human activities such as sea surface waves, marine biological activities, and aircraft travel. Make the characteristic distribution of the sound field changeable. Marine physics researchers have obtained the source of marine environmental noise and its sound spectrum by analyzing and studying the experimental data of the ocean acoustic field and related theories. Undersea volcanic eruptions or earthquakes can generate strong sound waves, which are the main source of low-frequency noise in the marine environment. The noise caused by wind, waves and tidal currents is an important part of the background noise of the ocean. Wind, waves and tidal currents wi...

AI Technical Summary

Problems solved by technology

Especially in coastal shallow sea environment with serious multipath effect and scattering phenomenon to detect long-range targets, the detection distance of sonar will be greatly reduced for every decibel noise increase in marine environment

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