陀螺寻北仪二位置寻北方案

Two-Position Detecting Scheme for Gyro-Based North Seeker

讨论了挠性陀螺寻北仪二位置寻北方案。二位置寻北方案是利用陀螺仪敏感在相差180°的两个方向上的地球自转角速率分量,准确解算出地理真北方向与陀螺轴向的交角,从而实现寻北的方案。该方案利用转位对消了陀螺的常值漂移,因此,大大降低了对陀螺精度的要求,已经成功的应用于我所研制的CFN系列寻北仪中。实践证明:对于双轴陀螺采用二位置寻北方案易于实现,精度较高。

This paper discusses the two-position detecting scheme for flexible gyro-based north seeker. With the help of earth rate components sensed by gyroscope at two azimuths with a phase difference of 180°, the intersecting angle between geographic true north and reference axis of gyro can be calculated, thus the north is accurately located. In this scheme the constant drift is cancelled by position transformation. Meanwhile, which presents less stringent requirement on accuracy of gyroscope. This scheme has been applied to CFN series of north seekers developed by Sichuan Institute of Piezoelectrics and Acoustooptics Technology, and shows that higher accuracy can be obtained by adopting two-position detecting scheme based on double-axis gyro.