摘要汽车防碰撞是以雷达测距、测速为基础的。在交通环境日益恶化的今天，通过汽车防碰撞雷达来防止因驾驶人员的疏忽而产生的交通事故也变得格外重要。本文主要针对汽车防撞雷达中测距测速信号处理电路进行设计。
本设计分别对以滤波器组、周期计数法和快速傅立叶变换法进行信号处理的方案进行了讨论，在MATLAB，QuartusⅡ等环境下进行了功能仿真，并对周期计数法利用CycloneⅡ开发板做了硬件测试，经测试，电路性能符合设计要求。
在设计的具体实践中，除了对重点的测频方案进行了详细讨论外，还对电路的前置电路和判决电路进行了设计。在前置电路的设计中，考虑了是否对多普勒信号进行提取的两种电路方案，并进行了信号分析；在判决电路的设计中，采用verilog HDL语言进行了程序编写，并在CycloneⅡ中通过了功能测试。9520
关键字：汽车防碰撞，滤波器，周期计数，快速傅立叶变换，软件仿真，硬件测试
毕业设计说明书（论文）外文摘要
Title Automotive linear FM collision avoidance radar signal processing circuit design
Abstract
Automotive anti-collision based on radar range, velocity-based.For today's traffic environment is deteriorating, automotive anti-collision radar to prevent traffic accidents due to negligence of the driver also has become particularly important.In this paper, the design speed signal processing circuit for automotive collision avoidance radar ranging.
This design of filter bank, the cycle counting method and fast Fourier transform method, the signal processing program, functional simulation of MATLAB, the Quartus II environment, and cycle counting method using the Cyclone II development board hardware test, the test circuit performance to meet the design requirements.
The concrete practice of the design, in addition to a detailed discussion of the focus on measurement of frequency, also the lead circuit and decision circuit of the circuit design. Front end circuit design, to consider whether the Doppler signal extracted from the two circuits, and signal analysis; in the judgment of the circuit design using Verilog HDL language programming, and in the Cyclone II by a functional test.
Keywords Vehicle anti-collision ，Filter , Cycle count , Fast Fourier Transform ，functional simulation ，hardware testing
目录
1、引言-1
2、系统工作原理、信号分析及处理方法
2.1目标信号分析
2.1.1回波信号-3
2.1.2测距测速信号分析-5
2.2信号处理方法
2.2.1数字滤波器模型8
2.2.1.1 FIR数字滤波器基本理论10
2.2.1.2设计FIR滤波器常用方法-10
2.2.2快速傅立叶变换-13
2.3系统实现所用软件及开发板
2.3.1开发板CycloneⅡ-15
2.3.2开发软件QuartusⅡ-16
3、前置电路设计
3.1基本测距前置电路18
3.2多普勒信号的提取18
4、信号处理电路设计
4.1滤波器组电路设计
4.1.1滤波器组原理-20
4.1.2基于MATLAB的功能仿真21
4.1.3基于QuartusⅡ的功能测试-26
4.2周期法测频电路实现
4.2.1周期测频原理26
4.2.2基于Quartus的功能测试26
4.2.3测速测距部分整体测试27
4.3快速傅立叶变换（FFT）实现
4.3.1快速傅立叶变换原理-27
4.3.2基于MATLAB的功能仿真28
5、判决电路设计-29 VHDL汽车线性调频防撞雷达信号处理电路设计:http://www.youerw.com/tongxin/lunwen_8270.html