【摘要】 介绍了基于双频率锯齿波组合调制的谐振式光纤陀螺(R-FOG)的检测原理,分析了数字系统信号相关检测的理论.通过分析陀螺输出信号的特点,利用可编程逻辑器件(FPGA)产生的同步方波进行解调,优化设计了一种用于R-FOG检测系统的数字锁相放大器,并分析了其相关检测的信噪比改善.应用于陀螺系统,实现了谐振频率快速、稳定的跟踪锁定.实验结果表明,设计的检测电路满足闭环反馈的精度要求,锁定时间为1.1 ms.更多还原

【Abstract】 The detection theory of resonator fiber optic gyro(R-FOG) based on the serrodyne modulation with two frequencies was introduced,and the correlative detection theory in digital system was analyzed.According to the characteristics of the detection signal in the gyro system,and using the synchronous square wave produced in the field programmable gate array(FPGA),a digital lock-in amplifier used in R-FOG was designed and its signal noise ratio(SNR) was analyzed.Applying the lock-in amplifier to the gyro system,the resonance frequency was locked quickly and stably.Experimental results indicated that the lock-in amplifier satisfied the precision needed in the closed-loop feedback and the locking time was 1.1 ms.更多还原