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

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0.6ms远低于常规5ms延迟,满足了激光陀螺信号解调高精度低延时的要求。

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 hut 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 princi- ple 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 sec- onds 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 systena.