高精度光纤陀螺高带宽信号检测方案

研究兼顾静态性能和力学环境适应性的信号检测方案是高精度光纤陀螺实用化的迫切要求.分析了高精度光纤陀螺全数字闭环信号检测过程,推导了系统的闭环传递函数.一般的基频调制使检测系统的采样周期长、带宽低,反馈不能很好地补偿因力学环境产生的高频噪声信号,会破坏系统闭环,产生较大的动态误差.设计了三倍频调制/解调数字闭环信号检测方案,使采样周期是基频调制方案的1/3,有效提高了系统带宽.两种方案的力学环境实验和静态实验结果对比说明,三倍频方案明显提高了高精度光纤陀螺的力学环境适应性,同时静态性能不受影响,能够满足实际应用的要求.

Broad bandwidth signal detection scheme for high precision fiber optic gyroscope

Good static and dynamics environment performance of the signal detection scheme is necessary to meet the practice application of the high precision fiber optic gyroscope(HPFOG).All-digital closed-loop signal detection procedure of HPFOG was analyzed.Closed-loop transfer function of the detection system was derived.The general eigen frequency modulation caused the long sample period and low bandwidth.The feedback can not null high frequency noise signal caused by the dynamics environment.The closed-loop system was destroyed,and unacceptable dynamic error was caused.The signal detection scheme based on triple eigen frequency modulation/demodulation was designed.The sample period was 1/3 that of the eigen frequency modulation,and the system bandwidth was increased effectively.The dynamics environment and static experiment results of the two schemes were compared.It shows that the triple eigen frequency signal detection scheme improved the dynamics environment adaptability of the HPFOG effectively,and the static performance is not infected.This can satisfy the application needs.