相位式激光测距仪的改进设计  

Research on the Improvement of the Phase-based Laser Rangefinder Design

作　　者：殷甲青[1] 孙胜利[1] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083

出　　处：《激光与红外》2006年第4期265-268,共4页Laser & Infrared

摘　　要：文章在分析目前常见的激光测距仪原理和机构的基础上,提出了在相位式测距仪中,利用欠采样技术与同步检测原理改进测相方法,来降低数据处理的复杂程度;同时文中还阐述了利用晶体滤波器和直接数字频率合成计(DDS)进行滤波及产生调制信号,改进测距仪的滤波与调制手段。实验结果表明,采用文中设计方法搭建的测距系统,整体结构和性能均得到了改进,数字化与自动化程度提高,还增强了测距仪的适用性。This paper presents a new method, which is based on the analysis of the principles and structures of the familiar laser rangefinders, to improve the phase measurement with the undersampling technique and synchronous detection in the phase-based laser rangefinder design. The application of the two technique is proved to be able to reduce the complexity of the interrelated data processing. And more, this paper introduces the using of the crystal filter and Direct Digital Synthesizer （DDS） to filter out impurities and to generate the modulation signals. The filtering and modulating capability of the rangefinder can be enhanced by these components. The experiment associated with the laser rangefinder designed in the mentioned methods has been done, and results indicate that the whole performance, digitization, automation and applicability of the equipment are improved. Meanwhile, it is more applicable to practical situations.

关 键 词：激光测距 相位检测 欠采样技术 数字同步检测 晶体滤波 直接数字频率合成计 

分 类 号：P225.5[天文地球—大地测量学与测量工程]