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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。
A laser north-finder with arbitrary two positions of a laser gyro is introduced, which can save the whole process of searching for a whole North to a certain extent and deduce the formula of north seeking solution under full attitude. In order to improve north-seeking accuracy of the whole system, the effect of gyro drifting error, system circumferential error and translocation error on any two-position north finding is theoretically analyzed. An error mathematical model is established and a method to reduce north seeking error is proposed . The simulation results show that the north-seeking error caused by the translocation error in the horizontal state is a constant and the size is half of the translocation error. In order to ensure a sufficiently high north-seeking accuracy, the North-seeking finder is required to have a corner angle μ≥40 ° , Latitude φ ≤ 70 °. The results of the North-seeking experiment further verify the correctness of the simulation results, which are in good agreement with the theoretical analysis.