采用差频技术的正弦调制型微波测距系统研究  

Research on sinusoidal modulation microwave ranging system based on heterodyne technique

作　　者：李存龙[1] 陈伟民[1] 章鹏[1] 郑大青[1] 严蓉[1] 陈丽[1] 

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400044

出　　处：《电子测量与仪器学报》2014年第1期17-21,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(51078369)资助项目

摘　　要：针对目前无线定位中单点测距精度较低的问题,提出一种基于差频技术的正弦调制型微波测距方法;该方法采用有源反射式目标点实现远距离的测距,采用差频测相技术实现系统的高精度测距,采用基于时间数字转换器(time-to-digital converter)的时间差模块实现高精度相位测量;采用现有商业化器件搭建了实验系统并进行了测距实验研究,大位移试验中该系统的测距线性度约为0.999 9,小位移实验中测距精度约为2.86 cm,分辨率优于10 cm。Aiming at the low accuracy of single point ranging, a microwave ranging method based on heterodyne technique is proposed. The ranging signal, which accomplishes the distance measurement, is modulated by the sig-nal carrier. Active reflector is adopted to realize long-distance ranging. Heterodyne technique and time-to-digital converter are used in the system, so that high accuracy ranging guarantee. The system is fabricated by commercial components. Outdoor experiments were conducted to evaluate the performance of the system, during large displace-ment experiment, the linearity of ranging system is about 0. 999 9. During small displacement experiment, the accu-racy of ranging system is about 2.86 cm and the resolution is better than 10 cm.

关 键 词：单点测距 差频技术 时间数字转换器 微波测距 

分 类 号：TN953.2[电子电信—信号与信息处理]