A drive signal frequency-lock method for quartz angular-rate sensor is presented. The calculation result obtained by the equivalent volume force analytic method indicated that when taking the inherent frequency of the...A drive signal frequency-lock method for quartz angular-rate sensor is presented. The calculation result obtained by the equivalent volume force analytic method indicated that when taking the inherent frequency of the drive tines as the drive signal frequency the phase of the reference vibration is 90° behind that of the drive signal, and the square of amplitude is less than that of the maximal amplitude by 1/(4Q~2_d) merely. The curves derived from the finite element analytic method proved that near the inherent frequency the phase shift of the feedback voltage is identical to that of the reference vibration, and the amplitude is proportional to that of the reference vibration, and the phase shift is linear approximatively with the frequency shift. The frequency shift could be calculated according to the phase shift obtained by quadrature correlation detection, so the drive signal frequency could be locked at the inherent frequency of the drive tines by means of iteration.展开更多
文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯...文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯性姿态精度,以满足长时间精度保持的系统要求。工程实测数据表明,该标定补偿技术的应用能够使光纤捷联航姿准确测量地球自转角速率,有效减小对准零位误差,提升长期姿态精度,实现优于4 h 0.5°的姿态指标要求。展开更多
文摘A drive signal frequency-lock method for quartz angular-rate sensor is presented. The calculation result obtained by the equivalent volume force analytic method indicated that when taking the inherent frequency of the drive tines as the drive signal frequency the phase of the reference vibration is 90° behind that of the drive signal, and the square of amplitude is less than that of the maximal amplitude by 1/(4Q~2_d) merely. The curves derived from the finite element analytic method proved that near the inherent frequency the phase shift of the feedback voltage is identical to that of the reference vibration, and the amplitude is proportional to that of the reference vibration, and the phase shift is linear approximatively with the frequency shift. The frequency shift could be calculated according to the phase shift obtained by quadrature correlation detection, so the drive signal frequency could be locked at the inherent frequency of the drive tines by means of iteration.
文摘文章主要基于某型光纤捷联航姿研制过程中出现的转位后纯惯性姿态发散快的问题开展研究,分析定位问题原因,针对光纤陀螺小角速率标度因数存在的非线性特点,通过误差建模及标定补偿技术,提升小角速率标度因数线性度、航姿对准精度及纯惯性姿态精度,以满足长时间精度保持的系统要求。工程实测数据表明,该标定补偿技术的应用能够使光纤捷联航姿准确测量地球自转角速率,有效减小对准零位误差,提升长期姿态精度,实现优于4 h 0.5°的姿态指标要求。