Weak signal detection under complex background and characteristic analysis system

Abstract

The weak signal detecting and characteristic analyzing system in complicated background is used in automatic detection, recording marine environment noise and sailing noise characteristic. It includes detection subsystem, signal processing subsystem and auxiliary subsystem. The detection subsystem comprising amplifier, gain attenuation network, program controlled band pass filter, limiting amplifier, comparator and monochip processor, completes weak signal detection by means of zero-crossing quantity, gain value and Nyman-Pearson detection. The signal processing subsystem comprising universal peripheral interface, high speed digital processor and acquirer is used in analyzing noise and recording spectrum characteristic. The auxiliary subsystem comprising power source module, power failure monitoring module, parallel interface and serial interface is connected to printer and computer for further research and information storing.

Description

technical field [0001] The invention relates to a weak signal detection and feature analysis system under complex background, which is a device for automatically detecting and recording the characteristics of marine environment noise and ship noise, involving signal detection, pattern recognition and other fields, and can be directly applied to the early warning of underwater weapons In duty system and combat fuze. Background technique [0002] Our country has very rich marine resources. It is very meaningful to understand the many hydrological data of the ocean in various sea areas and to track and study the activities of marine organisms in a certain sea area for economic development and environmental protection. However, the study of the noise characteristics of ships is of great significance to the safety of ships. Noise reduction processing is an important national defense task for safeguarding the safety of our country's vast adjacent seas. Therefore, it is necessary ...

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Problems solved by technology

However, these systems and products have many disadvantages: (1) The equipment is large in size or fixed in shape, and cannot form a subsystem for use in a system with specific requirements; (2) It is expensive, which greatly increases the cost of the system. The A / D device with power consumption basically completes the performance of the system, but the cost is too high (about dozens or even hundreds of times); (3) The total gain and the gain unit size are fixed, which cannot be flexibly changed according to actual needs, and are inconvenient to use

On the other hand, the detection algorithm is too complicated (such as Wu Guoqing et al., Detection of short-time spectrum shape and spectral correlation method of underwater acoustic transient signal, Acta Acoustica Sinica, Vol.25, No.6, 510-515) cannot be used in the actual real-time detection system. used in

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