基于光纤陀螺零偏稳定性的高精度寻北方案

High precision north determining scheme based on FOG bias stability

为了进一步提高光纤陀螺寻北系统的测量精度,提出了一种基于光纤陀螺零偏稳定性分析的寻北算法设计方案。首先,分析了光纤陀螺寻北系统的原理和影响系统寻北精度的主要因素,指明在寻北时间一定的情况下,需要根据光纤陀螺零偏稳定性的测试结果来平衡单位置积分时间及位置数,来达到较高的寻北精度。实验数据表明,本系统利用精度为0.03(°)/h的陀螺进行5min寻北测试,采用56位置法可以实现3′的寻北精度。此方法突破了传统寻北算法的参数选择标准,能够最大程度抑制陀螺的测量噪声,大幅提高寻北系统性能,对其它陀螺寻北系统的参数选择具有借鉴意义。

In order to improve the precision of FOG North-seeker, a north determining scheme based on FOG bias stability was proposed. According to the expatiation on the principle of north-seeker and the main factors that influence the system accuracy, a balance was made between integral time of each position and number of positions in order to achieve high precision. Experiment data show that 56-position north determining scheme based on FOG of 0.03~/h could achieve the precision of 3＇ for this north seeker within 5 minutes. The technique could effectively restrain the measurement noise of FOG and improve the system performance compared with traditional algorithms.