激光陀螺任意二位置寻北仪及误差分析

Arbitrary two-position north finder based on ring laser gyro and error analysis

介绍了一种激光陀螺任意二位置寻北仪,可在一定程度上节省整个寻北过程的时间,推导了全姿态下的寻北解算公式。为提高整个系统的寻北精度,从理论上分析了陀螺漂移误差、系统圆周误差和转位误差对任意二位置寻北的影响,建立了误差数学模型,并提出了减小寻北误差的方法。仿真结果表明,水平状态下的转位误差引起的寻北误差是一个常量,大小为转位误差的一半;为保证足够高的寻北精度,要求寻北仪在使用过程中转角μ≥40°,纬度φ≤70°。寻北实验结果进一步验证了仿真结果的正确性,与理论分析结果相吻合。

An arbitrary two-position north finder based on ring laser gyro was introduced. It can save the time of north finder to a certain extent. The solver formula of north finder in the whole attitude was derived. In order to improve the accuracy of north finder, the impact of the various errors including the drift of gyro, system circumference error and position transposition error on the accuracy of the arbitrary two-position north finder was analyzed theoretically, and the mathematical model of errors were established, and the method of reducing the error was proposed. Simulation result indicates that the position transformation under the level state bringing error of north finder is a constant, and is half of the position transformation. In order to ensure an enough high accuracy of north seeking, it requires the comer μ≥40° and the latitude φ≤70° of north finder in the course. The results of north finder further validate the correctness of the simulation results, consistent with the theoretical analysis.