本科毕业设计（论文）通过答辩 目 录 摘要 .................................................................................................................................. 1 关键词 .............................................................................................................................. 1 1 前言 ............................................................................................................................... 3 1.1激光测距研究及发展现状 ......................................................................................... 3 1.2课题的研究目的和意义 ............................................................................................. 4 1.3课题研究的内容 ......................................................................................................... 7 2 相位式激光测距技术研究 ........................................................................................... 7 2.1相位式激光测距技术原理 ......................................................................................... 7 2.2相位式激光测距多测尺原理 ..................................................................................... 9 2.3差频测相原理 ........................................................................................................... 11 2.4自动增益控制原理 ................................................................................................... 12 2.5光电探测器 ............................................................................................................... 13 3 相位式激光测距仪控制电路的设计 ......................................................................... 18 3.1相位式激光测距仪的整体设计 ............................................................................... 18 3.2光电检测器的选择 ................................................................................................... 19 3.3APD高压偏置电路的设计 ....................................................................................... 20 3.4温度补偿电路 ........................................................................................................... 23 3.5自动增益控制电路AGC.......................................................................................... 27 3.6混频电路 ................................................................................................................... 32 4 相位式激光测距仪软件系统设计 ............................................................................. 34 5 仿真结果及分析 ......................................................................................................... 35 5.1APD高压偏置电路的仿真结果及分析 ................................................................... 35 5.2自动增益控制电路的仿真结果及分析 ................................................................... 39 6 结论 ............................................................................................................................. 42本科毕业设计（论文）通过答辩 参考文献 ......................................................................................................................... 43 致谢 ................................................................................................................................. 43 附录 ................................................................................................................................. 48 本科毕业设计（论文）通过答辩

1 手持式激光测距仪的设计

摘 要:本文首先介绍了相位式激光测距仪的研究背景、意义，总结和概括了激光测距的有关

理论基础，并且介绍了相位式激光测距仪的测距原理，提出了测距系统的实现框图；接着围绕接收系统的性能开展深入研究，主要研究探测器件的选择，偏压电路、混频电路、自动增益控制电路的设计等问题；利用Proteus技术对APD偏压电路和自动增益控制电路进行仿真，通过仿真结果不断完善设计，并对这一设计进行研究、发展和创新，使得测距系统的测量精度得到了很好的保证及提高，降低了硬件成本，简化了控制电路。 关键词: 激光测距；雪崩二极管；相位；混频；自动增益控制 本科毕业设计（论文）通过答辩

2 Design of Hand-held Type Laser Rangefinder

Abstract: This paper started from the background, the purposes, meanings of phase-shift laser

ranging, then summarized the related theoretical basis of it. The principle of phase laser ranging and a practical ranging system is discussed. This paper concentrate on the researh of improving the porperty of receiving system. Lots of research have done on choosing detection element，design of the bias circuit and automatic gain control circuit. Then，the proteus is used for simulation of them. With the help of the simulation, the design was improved,and with the research, development and innovation of the technology, we have ensured and developed the measurement accuracy of the ranging system, reduced the cost of the hardware and simplified the control circuit. Key Words: laser ranging; avalanche diode; phase; mixer circuit; automatic gain control