基于MATLAB的不校正自差的磁罗经使用研究

磁罗经是船舶必备的导航仪器,由于船磁的影响,要使用磁罗经需要先校正磁罗经自差。为达到不校正自差而使用磁罗经,通过采集船舶转向一周里部分罗航向对应的自差,根据磁罗经自差基本公式建立方程组,利用MATLAB软件求得自差系数。然后把自差系数代入自差基本公式求解出任意航向上的自差。结果表明,利用自差基本公式求解出的航向自差与在该航向上进行的实测自差在1°以内,能够很好地代替实测自差来使用磁罗经。

Magnetic compass application without self-deviation adjustment based on MATLAB

As a necessary navigation instrument on a ship, magnetic compass needs to be adjusted before the application due to the magnetic force on the earth. In order to use the magnetic compass without adjustment, this paper ifrstly collects the partial self-deviations corresponding to the compass course during the ship turns round in a circle. The self-deviation coeffcients are obtained with MATLAB by solving a set of equations based on the basic self-deviation formula of the magnetic compass. The self-deviation coeffcients are then substituted into the basic formula to get the self-deviations on any compass course. The results show that the difference between the self-deviations solved by the basic formula and the measured self-deviations are within one degree. Therefore, the solved self-deviations can be used on the magnetic compass instead of the measured ones.