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为实现灵活的参数调整、改善陀螺的控制性能和进行误差补偿,提出了一种用于微机械陀螺的数字读出系统。该系统通过对陀螺输出信号进行数字化,并采用浮点数字信号处理器(DSP)进行反馈控制和算法解调,实现了对微机械陀螺中的微小电容的检测,其中的解调算法采用了最小均方误差解调(LMSD)技术。仿真和实验结果表明:LMSD算法使噪声水平比经典的乘法解调算法下降了29%;将该数字读出系统用于大气条件下工作的一种振动轮式微机械陀螺,噪声水平达到0.0073(°)/(s.Hz-1/2),带宽为100Hz。
In order to realize the flexible parameter adjustment, improve the control performance of the gyroscope and compensate the error, a digital readout system for the micromechanical gyroscope is proposed. The system digitizes the gyro output signal and uses floating-point digital signal processor (DSP) for feedback control and algorithm demodulation to realize the detection of the tiny capacitance in the micromechanical gyroscope. The demodulation algorithm adopts the minimum Mean square error demodulation (LMSD) techniques. The simulation and experimental results show that LMSD algorithm can reduce the noise level by 29% compared with the classical multiplication and demodulation algorithm. Using a digital readout system with a vibrating wheel micromachined gyroscope under atmospheric conditions, the noise level reaches 0.0073 °) / (s.Hz-1/2) with a bandwidth of 100 Hz.