旋转环境下的无线时钟抖动估计与修正方法  

Wireless clock jitter estimation and correction method in rotating environment

作　　者：卢翔宇[1] 陈正武[1] 刘雄 Lu Xiangyu;Chen Zhengwu;Liu Xiong(Laboratory of Aerodynamic Noise Control,China Aerodynamic Research and Development Center,Mianyang 621000,China;School of Information Engineering,Southwest University of Science and Technology,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心气动噪声控制实验室,四川绵阳621000 [2]西南科技大学信息工程学院,四川绵阳621000

出　　处：《电子技术应用》2022年第8期76-80,85,共6页Application of Electronic Technique

摘　　要：直升机旋翼表面非定常载荷测量试验中,导电滑环的性能优劣和现场环境的电磁辐射对外部时钟信号的质量影响较大,受影响的外部时钟信号会导致错误的采集动作,从而无法准确地获取特定方位角处的载荷数据。为提高外部时钟信号的品质,提出一种用于旋转环境下的数据采集系统的无线时钟抖动估计及修正方法,即外部时钟信号经无线收发模块传输,采用两组相位差90°的三角波进行等幅度斜边估计时钟抖动量,并且使用拉格朗日插值算法修正传感器的采样值。仿真与风洞表明,该方法能有效地减小外部时钟抖动造成的采集误差,对准确测量旋转环境下旋翼表面的载荷信号具有显著效果。In the measurement test of unsteady load on helicopter rotor surface,the performance of slip ring and the electromagnetic radiation of the field environment have great influence on the quality of external clock signal.In some serious cases,the affected external clock signal may lead to erroneous acquisition actions,which makes it impossible to accurately obtain the load data at a specific azimuth.In order to improve the quality of the external clock signal,a wireless clock jitter estimation and correction method of data acquisition system in rotating environment is proposed.The external clock signal is transmitted through the wireless transceiver modules,two sets of triangular waves with the phase difference of 90°are used to estimate the clock jitter with equal amplitude hypotenuse,and the Lagrange interpolation algorithm is used to correct the samples of sensors.Simulation and wind tunnel tests show that this method can effectively reduce the acquisition error caused by external clock jitter,and has significant effect on accurately measuring the load signal on the rotor surface in rotating environment.

关 键 词：外部时钟 时钟抖动 数据采集系统 三角波 插值修正 

分 类 号：TN919.3[电子电信—通信与信息系统]