基于多周期测量的四频差动激光陀螺高精度信号解调

分析了四频差动激光陀螺信号的解调原理，针对采用频率测量计数解调方法存在脉冲量化造成的角速度测量分辨率低的问题，改用多周期测量来代替频率测量，大大提高了四频差动激光陀螺信号的解调精度。通过数字滤波器滤波处理，可以减少随机噪声干扰，进一步提高精度。为满足实时性要求，该方法采用FPGA来实现。实验表明，此方法提高了四频差动激光陀螺角速度测量分辨率，为快速高精度方位自对准奠定了基础。

Signal Demodulation for Differential Laser Gyros Based on Measurement of Multiple Periods

The theory of differential laser gyros demodulation is analyzed. A method of period measurement is proposed to solve the low resolution of angle rate measurement, which uses the method of frequency measurement. The precision using the improved method is increased. Then a digital filter is designed to decrease random noise, which could further increase the demodulation precision. The method is implemented by FPGA to meet the real-time requirements. The experiments show that the method increases resolution of differential laser gyros angle rate measurement.