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半球谐振陀螺控制电路的控制精度直接影响半球谐振陀螺仪的输出精度,而频率跟踪精度又直接影响了半球谐振陀螺控制电路的精度。传统的半球谐振陀螺数字控制电路采用过零比较的方法计算陀螺幅点信号的频率,此方法易受地线毛刺信号的干扰,频率跟踪精度不高。介绍了采用A/D转换采集数据估算陀螺幅点信号频率的方法,并对各种方法进行了优缺点比较,提出选用建议。这些方法既提升电路抗干扰能力,又大幅提升了频率跟踪精度,还省去了过零比较电路。分析及测试结果表明,采用该频率跟踪方法,半球谐振陀螺的频率跟踪精度可达0.002Hz,可大幅提升半球谐振陀螺控制电路的精度。
The control accuracy of the hemispherical resonant gyro control circuit directly affects the output accuracy of the hemispherical resonant gyro, and the frequency tracking accuracy directly affects the accuracy of the hemispherical resonant gyro control circuit. The traditional hemispherical resonant gyro digital control circuit uses the method of zero-crossing comparison to calculate the frequency of the gyro amplitude point signal. This method is susceptible to the interference of the ground glitch signal, and the frequency tracking accuracy is not high. The method of estimating the frequency of gyroscope’s point signal by using A / D conversion data is introduced. The advantages and disadvantages of each method are compared, and some suggestions are put forward. These methods not only improve the circuit anti-interference ability, but also greatly improve the frequency tracking accuracy, but also eliminates the need for zero-crossing comparison circuit. The analysis and test results show that using the frequency tracking method, the frequency tracking accuracy of the hemispherical resonator gyroscope can reach 0.002Hz, which can greatly improve the accuracy of the hemispherical resonator gyro control circuit.