检测误差对半球谐振陀螺进动因子的影响分析

Analysis of Influence of Detection Errors on Precession Factor of Hemispherical Resonator Gyroscopes

全角(WA)模式的半球谐振陀螺(HRG)进动因子只与球壳谐振子的物理尺寸有关,但由于读出电极非正交耦合及间隙失配、检测电路增益误差等检测误差,导致进动因子的周向一致性退化。该文首先对理想半球谐振陀螺的进动因子进行了理论推导,然后针对检测误差对进动因子的影响进行了分析,结合具体的全角模式控制电路与算法,提出了检测误差的校正方法,最后通过实验验证了该校正方法的有效性。实验结果表明,进动因子的周向一致性提升了2个数量级。

The precession factor of hemispherical resonator gyroscopes(HRG)operating in the whole angle(WA)mode is only related to the spherical shell resonator.However,the detection errors such as the gap mismatch,the non-orthogonal coupling of the readout electrode and gain error of the detection circuit etc.,will cause the circumferential consistency degradation of the precession factor.Thus the precession factor of ideal HRG is theoretically deduced firstly,then the influence of the detection errors on the precession factor is analyzed,and a correction method of the detection errors is proposed in the specific WA control circuit and algorithms.Finally,the effectiveness of the correction method is verified by experiments.The experimental results show that the circumferential consistency of the precession factor has been improved by two orders of magnitude.