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

A technology for radiation noise and marine environment, which is applied in the field of aircraft radiation noise signal detection, and can solve problems such as the decrease of sonar detection range

Inactive Publication Date: 2017-11-07
XIAMEN UNIV
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Problems solved by technology

Especially in coastal shallow sea environment with serious multipath effect and scattering phenomenon to detect long-r...

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

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Embodiment Construction

[0082] 1. Framework for weak radiation noise signal detection of aircraft in marine environment

[0083] Please refer to figure 1 , the present invention mainly includes the weak signal detection technology of the three modules of aircraft body radiation noise signal sparse coding, mixed observation base feature extraction with adaptive sparsity and Euler field stochastic resonance. The aircraft radiation signal in the marine environment is sparsely represented in the Euler domain, so as to establish a sparse model of the observation signal; use compressed sensing technology to reconstruct the target, and use the Gail circle criterion and the mixed measurement matrix to reconstruct and characterize the target signal Extraction; use Euler field stochastic resonance to detect weak signals of aircraft radiation signals in marine environment.

[0084] The sparse coding of aircraft radiation noise signals uses the sparse representation in compressed sensing as the characteristics ...

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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...

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Application Information

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IPC IPC(8): G01S15/04G01H17/00
CPCG01S15/04G01H17/00
Inventor 齐洁孙海信苗永春许静萱朱正根周明章成垦
Owner XIAMEN UNIV
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