摘要本文以激光测距雷达的工作原理为基础，分析了高精度延时系统对模拟激光雷达回波信号的重要性。然后，比较了各种延时电路的优缺点。选择了以数字延时与模拟延时相结合方式设计的高精度延时器作为研究对象，探讨其相关特性。67452

随后，深入地探究了以FPGA数字延时模块、各种快速芯片模拟延时模块以及ARM控制模块为主体的高精度延时器的工作原理，详细地分析了每个模块功能作用。

为了评价高精度延时系统的性能，对各功能模块进行了测试，得出实验波形，并与理论仿真作对比，检测各模块功能。并对整个系统的延时性能进行测试，改进了测量方法，测得的系统延时精度达到了几百皮秒的量级，达到预期的实验效果。

毕业论文关键词  激光雷达  回波信号模拟器  高精度延时器  

毕业设计说明书（论文）外文摘要

Title    The Characteristic Research Of High-Precision Digital Delay                     

Abstract

This paper discusses the importance of the high-precision delay system to simulating laser radar’s return signal based on the working principle of laser ranging radar. Then it analyzes the advantages and disadvantages of various delay circuit. This paper chooses the high-precision delay with digital delay and analog delay designed in a way combining as the research subject, then exploring its relevant characteristics. 

Subsequently, in-depth exploration of the high-precision delay with FPGA digital delay module, various fast chip analog delay module and ARM control module as the mainstay works, detailed analysis of the functional role of each module.

Finally, for evaluating the delay system performance, the paper successively detects the functions of the various modules, then achieves the experimental waveform of each module, and compares with the theoretical simulation waveform. In addition, this paper also tests delay performance of the system, and also improves the measurement method. The measurement results show that the system has reached the order of magnitude of a few hundred picoseconds. Experiments achieve the desired results.

Keywords  LADAR  Return signal simulator  High-precision delay 

目   次

1  绪论 1

1.1  研究背景 1

1.2  本文的主要研究工作 2

1.3  本章小结 2

2  高精度延时器的理论分析 3

2.1  回波信号模拟器的理论分析 3

2.2  模拟器中高精度延时系统理论分析 3

2.2.1  数字延时电路 3

2.2.2  模拟延时电路 5

2.2.3  数字延时与模拟延时相结合 5

2.2  本章小结 6

3  高精度延时器工作原理 7

3.1  高精度延时电路系统 7

3.2  FPGA数字延时模块 8

3.3  模拟延时模块 10

3.3.1  系统整体供电电源模块