摘要为了提高战场侦察的隐蔽性，打击低空与地面目标，采用声探测的方式成了近几年的研究热点。声音传感器属于被动传感器，可布置隐蔽躲避侦测，而且成本低廉。一个完整的声目标识别系统需要具有的功能包括：目标探测，信号采集，信号处理和结果输出。本文的主要目标是设计出系统中的声信号调理电路，即传感器与信号采集系统的连接部分。根据不同情况，设计出了三种电路，分别为固定增益放大电路、自动增益放大电路与程控增益放大电路。使用Altium designer软件绘制出三种电路原理图，接着对这三种电路进行了特性分析，并加工出第三种电路进行了测试，效果良好，达到了设计要求。47604

毕业论文关键词  声探测  信号调理  电路设计 放大增益         

毕业设计说明书外文摘要

Title   The designation and characteristics analysis of   circuits of acoustic detection

Abstract

In order to improve the concealment of reconnaissance in the battlefield and fight against the targets on low air and ground , the method of acoustic detection has become hot point of the researches in recent years. Sound sensors are passive ,which can be set at a hidden place to avoid detection, and it cost little. A whole system of acoustic target recognition should have functions like: target detection  signal acquisition, signal processing and output of result.This article's main goal is to design a circuit which can adjust acoustic sign , namely the connection part of the sensor and signal acquisition system. According to the different situations, three kinds of circuits have been designed , they are respectively fixed gain amplified circuit, automatic gain amplified circuit and programmable gain amplified circuit. Use Altium designer software to design the three kinds of circuits principle diagram, then analyzes characteristics of these three kinds of circuits. ,finally,make up the third circuit and test it, which works well and has reached the requirements of the designation.

Keywords   acoustic detection  signal adjustment  circuit design   gain amplify   

目   录

1 引言 1

1.1 课题研究背景及意义 1

1.2 战场被动声探测技术国内外研究进展 1

1.3 本课题的主要任务 2

2 目标声信号分析与调理要求 4

2.1 声信号分析 4

2.2 调理电路设计要求 6

2.3 章末小结 9

3 高精度高增益放大电路设计 10

3.1 总体方案设计 10

3.2放大滤波模块 10

3.3 信号提示采集模块 11

3.4 本章小结 13

4 AGC自动增益放大电路 14

4.1 VCA610主要特性 14

4.2 基于VCA610自动增益放大电路设计 16

4.3 本章小结 18

5 程控增益放大电路设计 20

5.1常用程控放大电路原理分析 20

5.2 PGA程控增益放大电路总体方案 21

5.3 放大滤波模块 22