应用欠采样原理提高相位式激光测距精度  

Precision improvement of undersampling theory using phasic laser rangefinder

作　　者：孙懋珩[1] 赵雯[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《红外与激光工程》2009年第1期70-73,共4页Infrared and Laser Engineering

基　　金：国家部委预研项目(42001070302)

摘　　要：在激光测距中,测程和测量精度一直都是一对矛盾体。在保证测程的同时,提高测量精度是本次设计的关键所在。相位式激光测距的传统思想是将高频信号进行混频之后得到频率较低的差频信号,使用FFT得到相位,但是信号经混频后会带来幅度的衰减和相位的偏移。为了解决该问题,提出一个新的思路,利用欠采样技术与同步检测原理改进测相方法,降低数据处理的复杂度,提高相位检测的精度。用MATLAB仿真有白噪声和其他干扰信号存在时欠采样技术测量相位的精度,经过误差分析之后进行改进并与传统的方法进行了比较。In laser rangefinder, the detecting range and measurement precision is a contradiction all the time. The key of our design is to improve the precision on the basis of keeping the detecting range. The traditional method of phase laser rangefinder is mixing the signals of high frequency to obtain the useful signal with low frequency, and then sampling it, applying FFr to acquire the phase. According to the phase, the distance could be calculated. After mixing, the signal amplitude would be attenuated, and the phase would be changed. To solve the problem, a new method was presented.Applying undersampling technology and the theory of synchronization measuring to improve the phase measurement, the complexity of data processing was reduced, and the precision of phase detecting was increased. To validate the feasibility of this method, phase precision was measured using undersampling technology, then was emulated by MATLAB when the white noise and other interfering singal exist. A better method was found after the errors cause was analyzed. And it is compared with the traditional method under the same condition.

关 键 词：激光测距 混频 FFT 欠采样 相位测量 

分 类 号：TN911[电子电信—通信与信息系统]