复杂背景下微弱信号检测和特征分析系统的实现

Realization of an Automatic Detection and Character Analysis System in the Complicated Background

本文实现了一种适用于复杂背景情况下长期自动探测和记录海洋环境噪声以及行船噪声特性的装置 .预处理模块利用过零检测、幅度检测原理探测信号 ,它不仅采用无 A/ D且作到全数字化处理、系统低功耗极低 ,而且能估算出噪声强度 .信号处理模块分析噪声并记录频谱特性和时域统计特性 .实际运行结果表明 ,该系统具有体积小、检测能力强和寿命长等优点 .另外它还具有实用的接口 ,可以与打印机。

In this paper, an automatic detection and record system which researching the ship radiated noise is presented. Based on zero crossing and limited band amplitude detection theory, the pretreatment cell, with low power consumption and without A/D converter, can not only detect the ship radiated noise but also estimate its acoustic intensity. The radiated noise can be analyzed and its spectrum can be recorded by signal processing cell. Experimental results indicate that this system has some advantages such as small size, reliable detection ability and long service time etc. This system has the friendly interface which can communicate with the computer and printer so that the data can be taken out and be ulteriorly studied.