Multisim生命探测雷达超低频微弱信号检测电路设计
毕业论文关键词 生命探测雷达 微弱信号检测 有源滤波 预处理
毕业设计说明书（论文）外文摘要
Title Life detection radar----ultra low frequency Weak signal detection circuit design
Abstract
The life detection radar is mainly used for detecting the inpidual life in some natural disasters and terrorist events. During the detection process,the life signal submerges in the complicated strong noise signal,so the life signal detection is very difficult.Based on the studies on weak signal detection at home and abroad,this paper designs a signal detection analog circuit to filter the noise signal,, which includes first order amplifying circuit, zero adjustment circuit, industrial frequency wave limit circuit, passive filtering circuit, band-pass active filtering circuit and second order amplifying circuit. It is used to preprocess the echo signal and extract the useful component. Each part of the circuit is simulated through Multisim,and design the life signal detection hardware circuit board through Altium Designer. Finally it is tested based on the hardware circuit.
Keywords life detection radar weak signal detection active filter preprocess
目 次
1 绪论.1
1.1 研究背景及意义1
1.2 生命信号检测国内外研究现状2
1.3 论文研究的主要内容及意义4
2 生命信号检测基本理论.5
2.1 生命探测雷达检测基本原理5
2.2 生命信号特征分析6
2.3 生命信号检测干扰信号分析6
2.3.1 环境背景产生的强杂波.6
2.3.2 人体运动产生的干扰.7
2.3.3 检测设备产生的干扰.8
3 生命信号检测方法.9
3.1 基于随机共振的检测方法. 9
3.2 基于小波变换的检测方法10
3.3 微弱信号模拟调理电路11
3.4 本章小结12
4 生命信号检测电路硬件设计.14
4.1 硬件电路总体设计方案14
4.2 一级放大电路设计及其Multisim仿真14
4.3 调零电路参数设计17
4.4 工频陷波电路电路设计与Multisim仿真17
4.5 无源滤波电路设计及其Multisim仿真20
4.6 有源带通滤波电路设计及其Multisim仿真21
4.7 二级放大电路设计及其Multisim仿真24
4.8 生命信号检测电路原理图26
5 信号检测电路硬件调试.27
结论.30
致谢.31
参考文献 32
1 绪论
生命探测仪作为一种先进的生命探测设备，可以用在地震、火灾、反恐等事发现场中，协助相关人员快速并准确的对生命个体进行检测，大幅度的提高了工作效率，为有生命体的搜寻、救护工作争取了宝贵的时间。它是根据人体自身特有的呼吸、心跳等生命体征信号来进行判决，而生命体征信号相对噪声干扰信号来说比较微弱，造成探测仪判决困难，所以设计一个生命信号检测电路显得尤为重要。