论文部分内容阅读
针对光纤陀螺在小角速度测量时存在数字相位斜波频繁复位的问题,建立了调制增益漂移条件下复位相位误差模型,分析了数字相位斜波频繁复位的机理和产生的条件。证明了数字相位斜波频繁复位是产生死区的因素之一。提出了一种具有类似施密特触发器特性的数字斜波滞回复位算法,通过分离数字相位斜波正负向累加区间,抑制频繁复位及其引起的死区。实验结果表明,在调制增益变小1%时,采用滞回复位算法可将死区范围从测量噪声的3倍减小至1倍左右。
Aiming at the frequent reset of digital phase ramps during the measurement of small angular velocity in fiber optic gyroscope, a reset phase error model with modulation gain drift is established and the mechanism and conditions of frequent reset of digital phase ramps are analyzed. It is proved that frequent reset of digital phase ramps is one of the factors that produce dead space. A digital ramp hysteresis reset algorithm with similar characteristics of Schmitt trigger is proposed. By separating the positive and negative accumulative intervals of the digital phase ramp, the frequent reset and its dead zone are suppressed. Experimental results show that the hysteresis reduction algorithm can reduce the deadband range from 3 times the measured noise to about 1 times when the modulation gain decreases by 1%.