Gain error analysis and calibration method of hemisphere resonance gyro circuit
江文杰 1王伟 1嵩甲晨 1陈家伟 1朱雨桐 1赵万良1
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作者信息
1. 上海航天控制技术研究所,上海 201109;上海惯性工程技术研究中心,上海 201109
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摘要
针对力平衡模式半球谐振陀螺标度因数和零偏受控制电路增益影响的问题,推导了包含控制电路增益的陀螺输出表达式,明确了控制电路增益对陀螺标度因数和零偏的影响机理,提出在控制电路中加入参考信号的增益校准方法,并通过Matlab仿真验证了所提方法的有效性.根据理论计算及仿真结果进行电路设计并开展增益校准实验.实验结果表明,所提校准方法将陀螺的 Allan 方差最低点由0.006(°)/h降低到了 0.002(°)/h,对应陀螺的零偏稳定性提升了 3倍.
Abstract
In response to the problem of the hemisphere resonance gyro scale factor and bias affected by the control circuit gain,the gyroscope output expression including control circuit gains is derived,the influence mechanism of the control circuit gain on the scale factor and zero bias of the gyro is clarified,and a gain calibration method by adding the reference signal to the control circuit is proposed.The effectiveness of the proposed method is verified by Matlab simulation.According to the theoretical calculation and simulation results,the circuit design and gain calibration experiment are carried out.The experiment results show that the proposed calibration method reduces the minimum Allan variance of the gyro from 0.006(°)/h to 0.002(°)/h,which increases the bias stability of the gyro is increased by 3 times.
关键词
力平衡模式/增益校准/标度因数/零偏稳定性
Key words
force rebalance mode/circuit gain calibration/scale factor/bias stability
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