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针对全反射棱镜式激光陀螺在跳模前后性能下降的现象,系统地研究了全反射棱镜式激光陀螺稳频特性。在对小抖动调制下光强调谐特性和稳频伺服部件理论分析的基础上,建立了全反射棱镜式激光陀螺稳频系统数学模型。给出了稳频精度与加热器电压和环境温升的一般关系及最佳跳模门限的理论计算公式。分析结果表明,环境温升速率的增大和加热器电压的降低会导致稳频性能下降,最佳跳模门限随环境温度的升高而增大,在全温范围内固定跳模门限会导致跳模后稳频性能衰减。采用变增益Ⅱ型系统稳频与最佳跳模门限设置,可以有效消除在跳模前后陀螺性能下降的现象,陀螺精度相应提高了40%以上。此分析结果为提高全反射棱镜式激光陀螺的性能提供了重要参考。
Aiming at the phenomenon that the total reflection prism laser gyro degrades before and after jumping mode, the frequency stabilization characteristics of the total reflection prism laser gyro are systematically studied. Based on the analysis of the light intensity tuning characteristics and the frequency stabilization servo components under small jitter modulation, a mathematical model of the total reflection prism laser gyro frequency stabilization system is established. The general relationship between frequency stabilization accuracy, heater voltage and ambient temperature rise and the theoretical calculation formula of the optimal jump threshold are given. The results show that the increase of ambient temperature and the decrease of heater voltage lead to the decrease of frequency stability. The optimal threshold of hopping mode increases with the increase of ambient temperature. The fixed jump threshold in the whole temperature range will lead to jump Die frequency stability degradation. The use of variable-gain type II system frequency stability and the optimal jump threshold set, can effectively eliminate the phenomenon of gyroscope performance before and after jumping mode, the gyro accuracy increased by more than 40%. The results of this analysis provide an important reference for improving the performance of TIR laser gyroscopes.