摘要
针对激光多普勒加速度测量系统信号信噪比较差的问题,提出了一种采用数字相关鉴相算法进行加速度解调的方法.使用数字相关鉴相算法计算激光多普勒加速度测量系统中两路干涉信号的相位差,再由相位差的变化率来计算目标加速度,从而实现运动物体加速度的连续测量.仿真结果表明:该算法在信噪比为20 dB时,加速度测量的误差为0.135 m/s^2,分辨率为7.3×10^-3 m/s^2.搭建了激光多普勒加速度测量系统,对压电陶瓷振荡器的加速度进行测量,加速度的测量误差为0.13 m/s^2.测量结果表明,该算法能够有效减少随机噪声的干扰,提高加速度的测量精度.
Aiming at the problem of a poor signal-to-noise ratio in the laser Doppler acceleration measurement system,the digital correlation phase-detection algorithm was proposed for acceleration demodulation.The phase difference between the two interference signals in the laser Doppler acceleration measurement system was calculated by the digital correlation phase discrimination algorithm,and the acceleration of target was calculated from the rate of change of the phase difference,thereby the continuous acceleration measurement of the moving object was realized.The simulation results show that the error of the acceleration measurement is 0.135 m/s^2 and the resolution is 7.3×10^-3 m/s^2,when the signal-to-noise ratio is 20 dB.The laser Doppler acceleration measurement system was built to measure the acceleration of the piezoelectric ceramic oscillator,the error of the acceleration measurement is 0.13 m/s^2.The measurement results show that the algorithm can reduce the interference of random noise and improve the accuracy of acceleration measurement.
作者
景亚冬
王可宁
冯嘉双
张雄星
王伟
JING Ya-dong;WANG Ke-ning;FENG Jia-shuang;ZHANG Xiong-xing;WANG Wei(School of Optoelectronics Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Provincial Key Laboratory of Combination and Intelligent Navigation,Xi’an 710068,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2019年第12期97-103,共7页
Acta Photonica Sinica
基金
西安市智能探视感知重点实验室项目(No.201805061ZD12CG45)
陕西省组合与智能导航重点实验室开放基金(No.SKLIIN-20180210)~~
关键词
光学相干
加速度测量
数字相关鉴相
多普勒效应
相位解调
Optical coherence
Acceleration measurement
Digital correlation phase detection
Doppler effect
Phase demodulation
