二频机抖激光陀螺高精度低延时信号解调电路设计

Design of High Precision and Low Latency Signal Demodulating Circuit on Mechanically Dithered Ring Laser Gyro

摘要:

在激光陀螺信号解调滤波过程中,工程上经常运用高阶FIR滤波电路来实现抖动信号剥除；这种方法虽然精度高但具有较高的延时,无法满足激光陀螺输出结果实时性的要求；为了解决这个问题,提出了一种基于FPGA的激光陀螺信号解调电路,利用自适应滤波原理对激光陀螺输出抖动信号进行自适应剥除,最后进行了相应精度及延迟测试；实验结果表明激光陀螺信号经过该系统自适应抖动剥除后效果较好,激光陀螺静态输出百秒方差仅为千分之三且系统延迟0.6 ms远低于常规5 ms延迟,满足了激光陀螺信号解调高精度低延时的要求。

Abstract:

In the process of laser gyro signal demodulation and filtering, Engineering often use higher-order FIR filter circuit to achieve jitter signal strip. However, this method, although high precision but with higher delay ,so the laser gyro output cannot meet real-time requirements. In order to solve this problem, proposed a laser gyro signal demodulation circuit based on FPGA, used adaptive filtering principle to strip laser gyro output jitter signal, finally, get on the corresponding accuracy and latency test. Experimental results show that laser gyro signal has a good shake effect after stripping of this system, laser gyro static output variance only three thousandths one hundred seconds and the system delay is 0.6 ms much lower than conventional systems 5 ms delay, meet the low-latency and high-precision on laser gyro system.