基于DSP的全数字闭环光纤陀螺

All Digital DSP Based Closed Loop Fiber Optic Gyroscope

介绍了一种采用ＤＳＰ（ＤｉｇｉｔａｌＳｉｇｎａｌＰｒｏｃｅｓｏｒ）技术实现的全数字闭环光纤陀螺．该闭环光纤陀螺采用以多功能集成光学器件为核心的全保偏结构，以方波为偏置调制，数字阶梯波反馈．文中对该闭环光纤陀螺的前置放大、信号检测、数字解调、数字滤波等部分进行了设计和实现，对采用ＤＳＰ技术解决系统精度和实时性矛盾的方案进行了讨论，并对闭环光纤陀螺的性能和参数进行了理论分析和实验测试．测试结果表明系统达到了小于０．３（°）／ｈ的零漂和１００×１０－６的非线性度指标．

An all digital closed loop fiber optic gyroscope (FOG) using digital signal processor (DSP) technique is presented.A multifunction integrated optic circuit (MIOC) is used, with square wave for biasing modulation and digital phase ramp for feed back. The design of signal detector,digital demodulator,preamplifier and digital filter is discussed, and theoretical analysis and experimental test on the performance and parameters of the closed loop fiber optic gyroscope are performed.A trade off between the system precision and response time using DSP is also discussed. Test results show that the bias of FOG is less than 0.3(°)/h, and the scale factor nonlinearity of FOG is less than 100×10 6.