基于FPGA的激光陀螺自适应抖动剥除

Adaptive Dither Stripper for Mechanical Dithered Ring Laser Gyro Based on FPGA

去除激光陀螺输出信号中的抖动信号是机械抖动偏频激光陀螺信号处理电路的主要工作之一。为了满足机械抖动偏频激光陀螺在快速跟踪中的应用要求,基于现场可编程芯片(FPGA)实现了激光陀螺自适应抖动剥除的软硬件设计,其次在静态条件下对系统抖动剥除效果和剥除后的激光陀螺零偏进行测试,最后进行动态试验,给出了LMS自适应抖动剥除的动态响应曲线,验证了LMS自适应抖动剥除的零延时性。实验结果表明,系统能有效去除陀螺输出信号中的抖动成分,其相位延迟几乎为0,完全可应用于需要实时输出角速率信息的场合。

The dither signal removal is one of the important works of mechanical dithered ring laser gyro signal processing. To meet the requirements of the fast tracking community,the hardware and software design of the adaptive dither stripper has been carried out based on FPGA. Then,the dither-stripping effect and gyro＇s null drift stability tests have been performed under the static condition. Finally, the dynamic response property of dither stripper has been tested, and the dynamic response curves are presented. The zero-latency feature of LMS adaptive dither stripper has been verified. The results showed that most of the dither signal has been removed by the dither stripper with almost no phase latency, and the dither stripper can be used for real-time angular rate measurement.