基于FPGA的光纤陀螺仪信号处理

Signal Processing Based on FPGA in FOG

采用数字信号调制解调技术对光纤陀螺进行闭环控制可以有效地提高光纤陀螺的精度,以大规模可编程逻辑器件(FPGA)为基础,将光纤陀螺中的第一环路与第二环路的数字段合并,用单D/A产生数字阶梯波,同时实现数字调制和闭环反馈的功能;基于Verilog HDL语言的两级模块设计与编程,完成各个信号的输入输出缓冲器的分配和闭环光纤陀螺全数字式信号处理;不同温度和输入的试验测试结果表明:陀螺的标度因子线性度优于80 ppm,这说明基于FPGA信号处理核心的单D/A反馈回路方案设计是成功的。

The closed-loop control method based on digital modulating and demodulating technology can greatly improve the precision of FOG. FPGA is used to develop the digital closed-loop detecting system of FOG based on integrating both of the feedback loops＇ digital part using single A/D. Practice in different temperatures and different inputs shows that the nonlinearity of scale factor is less than 80ppm, and the design system has great practical value.