静电陀螺寻北仪中的磁干扰

Magnetic disturbing torque to ESG north finder

电磁兼容性的问题尤其对采用静电陀螺作为核心元件的高精度寻北仪越来越显得重要。有关静电陀螺的文献对于静电干扰讨论较多，本文则侧重对静电陀螺寻北仪中的磁干扰进行讨论。磁干扰包括外部磁干扰和内部磁干扰，外部磁干扰可通过严格的电磁屏蔽加以排除，对于内部磁干扰本文推导了有关数学关系式，必要时可以加以补偿。

The electric disturbing and magnetic disturbing are critical to electrostatic suspended gyroscope (ESG) north finder, which is a kind of very precise north finder. The electrostatic disturbance in gravitational field and the magnetic disturbance can produce disturbing torque, then affect the accuracy of ESG north finder. This paper discusses magnetic disturbing torque (MDT) to ESG north finder. There are two kinds of MDT: the internal MDT and external MDT. The external MDT can be clear up with good shielding. Except for the magnetable elements that produce internal MDT, the whirlpool current in ESG rotor also produces internal MDT. For this internal MDT some mathematics analysis is presented. It is helpful with some software depending on the mathematics analysis.