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针对全反射棱镜式激光陀螺在稳频过程中相敏信号易受噪声干扰的现象,研究了全反射棱镜式激光陀螺自适应稳频技术。理论分析了全反射棱镜式激光陀螺的稳频特性,结合自适应噪声对消原理,建立了全反射棱镜式激光陀螺自适应稳频系统的数学模型。通过硬件电路设计,搭建了基于递归最小二乘算法的自适应稳频控制系统。分别对原有稳频技术与自适应稳频技术进行了实验测试,实验结果表明,自适应稳频能有效消除噪声对相敏信号的干扰,稳频精度提高了近一个数量级,陀螺精度相应提高了60%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 phase sensitive signal is easily disturbed by noise in the process of frequency stabilization of the total reflection prism laser gyro, the adaptive frequency stabilization technique of the total reflection prism laser gyro is studied. The frequency stability characteristics of TIR laser gyroscope are analyzed theoretically. Combined with the principle of adaptive noise cancellation, a mathematical model of TFSR stabilization system is established. Through hardware circuit design, an adaptive frequency stabilization control system based on recursive least squares algorithm is built. The experimental results show that the adaptive frequency stabilization can effectively eliminate the interference of noise on the phase-sensitive signal, the frequency stabilization accuracy is improved by nearly an order of magnitude, and the gyro accuracy is correspondingly improved More than 60%. The results of this analysis provide an important reference for improving the performance of TIR laser gyroscopes.