摘要由主动工作模式与被动工作模式相复合的系统共同构成了毫米波主被动复合探测系统。远程时,探测器工作于主动模式,搜索目标并且跟踪测距,。采用FPGA+DSP的工作方式对信号进行处理,FPGA主要用于实现主动测距及产生调制信号锯齿波的功能;DSP主要用于被动探测时对回波差频信号的分析,进行对目标二文定位功能的实现。27629
本文主要介绍了毫米波主被动复合探测的工作原理,并且采用恒定差频体制测距完成主动工作模式,主要FPGA芯片采用Xilinx公司的XC3S50芯片,该芯片可以用于输出频率可调的锯齿波调制信号。并且通过对调制频偏 的选择,调制周期 和差频 的选择来完成对于减少固定误差,增加规则区宽度和实现减少多普勒效应的影响。
通过对于在DDS技术下的调制信号生产,按照原理设计原理图并生成PCB版,我们能够实现恒定差频体制下的测距功能,最终实现对设定距离的目标的主动探测。
关键词:毫米波,恒定差频体制,FPGA,DSP
毕业论文设计说明书外文摘要
Title:Design of Constant Difference Frequency Distance measuring circuit
Abstract
System consists of active and passive mode to work mode compounded together constitute active and passive millimeter wave detection system. Remote, the detector works in active mode, the search target and track distance. Using FPGA + DSP works for signal processing, FPGA is mainly used to implement the initiative and produce a modulated signal ranging sawtooth function; DSP is mainly used for analysis of the echo signal at the difference frequency passive detection performed on the target of two-dimensional Location implement functions.
This paper describes the working principle of active and passive millimeter wave detection and ranging system using a constant frequency difference between the active operating mode is completed, the main FPGA chip using Xilinx's XC3S50 chip that can be used to modulate the output frequency is adjustable sawtooth signal. And by the choice of frequency deviation, the modulation period and difference frequency options to complete the reduction of fixed error, increase width and implement rules to reduce the impact of the Doppler effect.
Through the modulation signal DDS technology under production, in accordance with the principles of design schematics and generate PCB version, we were able to achieve a constant frequency difference between the distance under the system, and to achieve the set goals of the initiative from the probe.
Key Word: millimeter wave, Constant Difference Frequency System, FPGA, DSP
目 录
1 绪论1
1.1 课题背景.1
1.2 课题研究现状.4
1.3 论文的主要工作.6
2 调频测距近感系统7
2.1 调频雷达原理.7
2.2 三角波调频雷达测距原理.8
2.3 调频测距近感系统参数选择.9
3 恒定差频测距系统原理11
4 恒定差频测距系统的软件实现11
4.1 FPGA与DSP概述.13
4.2 DDS简述15
4.3 基于XC3S50芯片的主动模块设计16
4.4 目标测距算法.17
5 测距电路的硬件设计23
5.1 原理图的封装和设计.23
5.2 PCB的封装和设计28
结 论29
致 谢30
参考文献31
1 绪论
1.1 课题背景
1.1.1 选题目的与意义
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