中圖分類號(hào)： TN919.3 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.212498 中文引用格式： 盧翔宇，陳正武，劉雄. 旋轉(zhuǎn)環(huán)境下的無(wú)線時(shí)鐘抖動(dòng)估計(jì)與修正方法[J].電子技術(shù)應(yīng)用，2022，48(8)：76-80，85. 英文引用格式： Lu Xiangyu，Chen Zhengwu，Liu Xiong. Wireless clock jitter estimation and correction method in rotating environment[J]. Application of Electronic Technique，2022，48(8)：76-80，85.
Wireless clock jitter estimation and correction method in rotating environment
Lu Xiangyu1，Chen Zhengwu1，Liu Xiong2
1.Laboratory of Aerodynamic Noise Control，China Aerodynamic Research and Development Center，Mianyang 621000，China； 2.School of Information Engineering，Southwest University of Science and Technology，Mianyang 621000，China
Abstract： 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.
Key words : external clock；clock jitter；data acquisition system；triangle wave；interpolation correction
