半球谐振陀螺驱动电路仿真及实验研究

Simulation and Experimental Study on Driving Circuit of Hemispherical Resonant Gyroscope

半球谐振陀螺具有结构简单、抗辐射与冲击、寿命长、可靠性高等优点,其中驱动电路是获取高精度陀螺信号的关键。对影响半球谐振陀螺性能指标的单元电路展开了研究及优化设计,基于微弱信号处理、滤波等技术研究了提高检测电压稳定的方法。采用Tina-TI软件对设计电路的性能进行了仿真,实现了增益40 dB、噪声4.81μV/√Hz的整体电路设计。搭建陀螺样机测试了电路,根据实验结果给出了HRG不同叠加激励信号的作用下其输出信号的演变趋势。结果表明:随着直流、交流电压的增加,均会增大半球谐振陀螺输出信号的幅值;当激励信号电压不变时,交流信号的频率改变也会影响半球谐振陀螺输出信号的幅值。因此,研究半球谐振陀螺的激励信号对输出信号的影响,为设计半球谐振陀螺的驱动电路提供了参考。

Hemispherical resonator gyro has the advantages of simple structure,radiation and shock resistance,long life and high reliability,among which signal drive and readout circuit is the key to obtain high precision gyro signal.The unit circuits that affect the performance index of the gyroscope,such as signal readout circuit,excitation circuit and power supply circuit,are studied and optimized.Based on weak signal processing and filtering technology,the method to improve the detection voltage stability is studied.Tina-TI software is used to simulate the performance of the designed circuit,and the overall circuit design is realized with a gain of 40 dB and noise of 4.81μV/√Hz.A gyroscope prototype is built to test the readout circuit.According to the experimental results,the evolution trend of the output signal under the action of different superimposed excitation signals of HRG is given.The results show that the amplitude of the output signal increases with the increase of DC and AC voltage.When the voltage of excitation signal is constant,the frequency change of AC signal will also affect the amplitude of the output signal of hemispherical resonant gyro.Therefore,the study of the influence of the excitation signal of the hemispherical resonator gyro on the output signal provides the direction for the design of the driving circuit of the hemispherical resonator gyro.