基于FPGA的抖动偏频激光陀螺高精度信号解调

分析了抖动偏频激光陀螺信号的解调原理，提出了一种利用数字信号处理技术并采用FPGA实现的抖动解调方法；通过对激光陀螺脉冲计数值高速采样并采用数字滤波器滤波处理，可以有效消除抖动引起的信号噪声，得到所需的惯性角速率测量信息；增加数字预滤器，以滤除陀螺脉冲输出信号中的尖峰或毛刺干扰，可以进一步提高解调精度；为满足实时性要求，该方法采用FPGA来实现；实验表明，相对整周期采样解调，此方法提高了解调精度。

High-accuracy Signal Demodulation for Dithered Laser Gyros Based on FPGA

The theory of dithered laser gyros demodulation is analyzed. A new method of dithered demodulation by using digital signal processing technology and implemented by FPGA is proposed. By sampling with high speed and filtering the outputs of laser gyro, the method can remove the noise caused by dither and get the inertial angular rate needed. Prefilter is designed to eliminate the spikes or glitches on signal of dithered laser gyros, which could increase demodulation precision further. The method is implemented by FPGA to meet the real-time demand. The experiments show that compared with the whole cycle sampling demodulation, the method improves the precision of the demodulation.