光纤陀螺中的数字锁相放大器设计

Design of Digital Lockin Amplifier in Fiber Optic Gyroscope

提出了一种用于光纤陀螺信号检测的数字锁相放大器的设计方法。介绍了光纤陀螺信号检测技术的理论依据—相关检测 ,并针对数字闭环光纤陀螺的信号特点 ,对信号检测进行了分析。以此为依据 ,设计了数字锁相放大器 ,其中包括信号通道、参考通道以及相关器的设计 ,并分析了采用相关检测的信噪比改善 ,作了相应的实验。实验结果表明 :设计的检测电路能够满足高精度光纤陀螺信号检测的要求 ,被测陀螺达到了 0 .0 3 (°) /

In this paper,a kind of digital lockin amplifier used in FOG signal detection is designed.Correlative detection theory is analyzed from the signal characteristics of digital closedloop FOG.A digital lockin amplifier including signal channel,reference channel and correlator is designed,and the improvement of signal to noise is analyzed.The experimental results indicate that the designed detection circuit can meet the requirements of highprecision FOG,and the tested FOG reaches the index of 0.03 (°)/h.