摘要
针对半球谐振陀螺的共用电极结构引起振动检测信号中耦合干扰的问题,提出了一种抑制陀螺检测信号中耦合噪声的分频调制检测方法。从振动检测机理入手,首先建立了电容检测数学模型,分析了信号检测端的耦合噪声源。然后,通过改进激励与检测电极配置方法,利用两个不同频率的高频载波对谐振子x轴向和y轴向上的振动信息进行分频调制,实现了振动信号与驱动响应干扰信号的频域分离,经过信号检测器完成分频传输,从而抑制了耦合干扰。最后,进行了实验验证。实验结果表明所提出的方法相比使用较广泛的单频信号检测方法可有效抑制信号检测端的驱动耦合干扰,使控制回路锁相精度提高了一个数量级以上,陀螺输出信号噪声带由2.1 mV降至1 mV以内。
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.
作者
赵小明
李世杨
张悦
来琦
史炯
邓雅冲
Zhao Xiaoming;Li Shiyang;Zhang Yue;Lai Qi;Shi Jiong;Deng Yachong(Laboratory of Science and technology on Marine Navigation and Control,China State Shipbuilding Company,Tianjin 300131,China;Tianjin Navigation Instrument Research Institute,Tianjin 300131,China;Army Equipment Beijing Military Representative Office in Tianjin,Tianjin 300131,China)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2020年第1期94-99,共6页
Journal of Chinese Inertial Technology
基金
中船重工科技创新与研发项目(201810k)
装备预研项目(414170100602)。
关键词
半球谐振陀螺
信号检测
分频调制
驱动耦合干扰
hemispherical resonant gyroscope
signal detection
frequency division modulation
drive-coupling interference
