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激光陀螺作为位置姿态测量系统(POS)的核心传感器,其精度直接决定激光陀螺POS系统精度,围绕机抖激光陀螺信号去噪的需求,基于FIR滤波器建模的方法,设计了FIR数字低通滤波器;针对滤波器导致的信号延迟问题,根据FIR数字滤波器群延迟特性建模,提出了激光陀螺POS数据时延补偿方法。静态实验结果表明,设计的FIR数字低通滤波器降低了激光陀螺抖动噪声功率达80dB。进一步通过飞行实验表明,提出的方法降低了激光陀螺POS系统姿态角误差,与POS/AV510相比航向角误差由0.017°降低到0.01°,俯仰角误差由0.007°降低到0.005°,横滚角误差由0.016°降低到0.005°,满足了机载InSAR对激光陀螺POS精度要求。
As the core sensor of position and attitude measurement system (POS), the accuracy of laser gyro directly determines the accuracy of the laser gyro POS system. The requirement of de-noising of gyro laser gyro signal is based on the FIR filter modeling method. The FIR digital low pass Filter. In view of the signal delay problem caused by the filter, a method of delay compensation of the laser gyro POS data is proposed according to the modeling of the delay characteristics of the FIR digital filter bank. The static experimental results show that the design of the FIR digital low-pass filter reduces the laser gyro jitter noise power of 80dB. The flight experiment shows that the proposed method reduces the attitude angle error of the laser gyro POS system. The error of the heading angle is reduced from 0.017 ° to 0.01 ° compared with POS / AV510, and the error of pitch angle is reduced from 0.007 ° to 0.005 °. The roll angle The error is reduced from 0.016 ° to 0.005 °, which meets the requirement of on-board InSAR laser gyro POS accuracy.