准直误差对磁浮寻北仪寻北精度的影响分析

摘要

From the north-seeking principle of the magnetic levitation gyrocompass north-seeking instrument, the earth’s rotation angular velocity is decomposed to the gyro coordinate system. The north-seeking error is analyzed under the existing of collimation error and the relational expression between the collimation error and the north-seeking error is derived which be used for north-seeking accuracy compensation calculation. By this way, the problem of the precise collimation consume time resulting in the total north seeking time extended is avoided. The actual application shows that collimating range from 3" expand to 1', can shorten the magnetic levitation closed time about 60 s, by measuring the collimation error and compensating calculation, but the total north-seeking accuracy has not changed.%　　从磁悬浮陀螺寻北仪的寻北原理出发，将地球自转角速度分解到陀螺坐标系上，分析了存在准直误差的情况下所引起的寻北误差，推导出了用于补偿运算的准直误差与寻北误差之间的关系表达式，避免了精确准直消耗时间造成总寻北时间延长的问题。实际应用结果表明：准直范围由3″扩大到1′，可缩短磁浮闭路时间约60 s，通过测量准直误差并补偿，仪器总寻北精度没有改变。