基于光纤陀螺的单周快速动态寻北算法研究

Study of single-cycle fast dynamic north-seeking algorithm based on fiber-optic gyroscope

以单个单轴光纤陀螺为主要惯性测量器件,提出了一种新的基于单周期逐点最小二乘拟合的快速动态寻北方案。该方法先利用连续恒速的机械旋转将光纤陀螺的输出信号调制成一定频率的余弦调幅波;然后,通过恰当的数字滤波处理较好地抑制了随机漂移和各种高频干扰对测量精度的影响,最后,通过整周期逐点最小二乘拟合显著地降低了低频干扰的影响,提高了寻北精度;并在此基础上进行了实验室实际测试和误差分析。实验结果表明:选用精度0.8°/h的光纤陀螺和该寻北算法,在12′内便可实现10个角分的较高解算精度,操作简单,稳定性好。

With a single-axis fiber-optic gyroscope （FOG）as main inertia measuring instrument, a new fast dynamic north-seeking scheme based on single-cycle least square estimation method is presented. In the scheme, the output signal of FOG is firstly modulated as a fix-frequency sine wave by means of continuous revolution. And then gyro random drift and high-frequency disturb is effectively inhibited by right digital filtering. In the end, the influence of low-frequency disturb is reduced to the maximum limit and the north-seeking accuracy is improved by means of the single-cycle least square estimation method. Test result shows the new scheme is a simple fast steady dynamic north-seeking method. Using the scheme and precision of 0.8°/h. FOG can get 10 angular minute northseeking precision in 12′.