单轴光纤陀螺寻北仪

North seeker using single axis FOG

光纤陀螺寻北仪采用单光纤陀螺和双加速度计组合技术方案,通过二位置法测量消除了光纤陀螺的常值漂移和加速度计偏值的影响。通过增加一个从初始位置逆时针旋转90°的采样位置,实现了全方位寻北。为了消除静基座寻北时基座扰动对寻北精度的影响,基于抗差估计理论采用了高崩溃污染率的初值辅以IGGⅢ方案迭代解算的混合新算法。系统简单,容易实现且性能稳定。测试结果显示在5min之内寻北精度小于3′。

The FOG north-seeker adopts combined technical scheme with a FOG and double axis accelerometers. The constant drifts of FOG and the bias of accelerometers are eliminated by using two-position north seeking scheme. By adding a sampling position which contra-rotates 90° from the initial position of FOG axis, all-azimuth north-seeking is realized. In order to eliminate the effect of base disturbance on the precision of north seeker on a stationary carrier, a mixed iterative algorithm based on robust estimation is put forward, which is based on high breakdown point initial value and assisted by IGGIII scheme. Its structure is simple and its function is easily implemented, so the performance is stable. The tests show that the north seeking accuracy is less than 3′ in 5 min.