A frequency division modulation detection method of hemispherical resonance gyro signal for suppressing coupling interference

被引：0
|
作者：
Zhao X. [1 ,2 ]
Li S. [2 ]
Zhang Y. [2 ]
Lai Q. [2 ]
Shi J. [2 ]
Deng Y. [3 ]
机构：
[1] Laboratory of Science and technology on Marine Navigation and Control, China State Shipbuilding Company, Tianjin
[2] Tianjin Navigation Instrument Research Institute, Tianjin
[3] Army Equipment Beijing Military Representative Office in Tianjin, Tianjin
来源：
| 2020年 / Editorial Department of Journal of Chinese Inertial Technology卷 / 28期
关键词：
Drive-coupling interference; Frequency division modulation; Hemispherical resonant gyroscope; Signal detection;
D O I：
10.13695/j.cnki.12-1222/o3.2020.01.015
中图分类号：
学科分类号：
摘要：
Aiming at the problem of noise coupling interference in the vibration detection signal caused by the common electrode structure of the hemispherical resonant gyro, a frequency division modulation detection method was proposed to suppress the noise coupling in the gyro detection signal. Beginning with the mechanism of vibration detection, a mathematical model for capacitance detection was first established, and the coupled noise source of the signal detection end is analyzed. Then the excitation and detection electrode configuration method is improved, two high-frequency carriers with different frequencies were used to modulate vibration information of harmonic oscillator in the x-axis and y-axis direction. The vibration information is frequency-divided to achieve frequency-domain separation between the vibration signal and the drive response interference signal. The signal detector completes the frequency-division transmission, thus suppressing the coupling interference. Finally experimental verification was carried out. The results show that compared with the more widely used signal detection method, the proposed method can effectively suppress the drive coupling interference at the signal detection end, and the phase accuracy of the control loop is improved by more than an order of magnitude. The gyro output signal noise band is reduced from 2.1 mV to less than 1 mV. © 2020, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.
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页码：94 / 99
页数：5
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