旋转调制寻北方法的误差研究

Error Research of North Seeker Based on Revolution-Modulation

采用一个陀螺和一个加速度计可以组成最简单的旋转调制式寻北仪。影响寻北仪寻北精度的误差源有很多,不同误差源对寻北精度有着不同程度的影响。为了研究引起寻北误差的主要误差源对寻北结果的影响,对提出的寻北仪三种方法(二位置、四位置、连续旋转)的公式进行了推导,并采用MATLAB进行了仿真。仿真结果表明,影响寻北仪寻北精度的主要误差源为:初始航向角、陀螺常值漂移、采样时间、转位误差、转台旋转速率(连续旋转方法)、台面倾斜角等。结果可为寻北仪的优化研制提供了理论依据。

A simple rotary north-seeker includes only one gyroscope and one accelerometer. There are many fac- tors of north-seeking accuracy, and different error factors have different effects on north-seeking precision. In order to research the effects on north-seeking precision of the main error factors, a detailed two-position, four-position and the continuous rotary north-finder schemes were derivated, and the simulation analysis was tarred out with MATLAB. The simulation result show that, the main error factors of north-seeking accuracy include initial course angle, gyro constant drift, sampling time, transfer error, turntable rotation rate （ continuous rotation）, amt turntable tilt angle. The research result can provide a certain reference for the later north seeker prototype.