地磁传感器测量弹体滚转姿态方法研究

地磁传感器抗过载能力强且成本低,在制导炮弹中得到广泛应用,它的主要功能是测量弹体姿态;介绍了一种双轴地磁传感器测量弹体滚转姿态的方法,该双轴传感器固联在弹体横截面上;该测量方法利用地磁传感器随弹体滚转时感应磁场变化产生的正弦输出解算弹体滚转角速率及滚转方向,利用经纬度信息及弹体俯仰偏航信息,根据地磁场模型计算地磁场矢量在弹体横截面上的投影分量,然后由投影分量解算出滚转姿态角的基准角,最后根据双轴地磁传感器输出和基准角判定弹体姿态角;通过试验验证了该滚转姿态测量方法的可行性,并进行了误差分析,误差在可接受范围内,可满足简易制导炮弹需求。

Research on the Method of Measuring Projectiles Roll Attitude by Geomagnetic Sensors

Geomagnetic sensors had been far-ranging applied to guided cannonball owing to its high ability to over loading and low-cost. Geomagnetic sensors perform the function of measuring projectiles attitude. A method of measuring projectiles roll attitude by twi-axial geomagnetic sensors had been introduced. The sensors were installed on the cross section of projectiles, and rolled following the projectiles. This method used sensors＇ sine wave output to calculate roll rate and roll direction of projectiles; used geomagnetic model and the data of longitude, latitude, pitching and yawing to calculate the projection of geomagnetic field to the cross section of projectiles ; used projection to calculate the fiducial angle ; last, used the output of twi-axial geomagnetic sensor and fiducial angle to calculate the roll attitude angle. This method had been validated by experimentation, the measure error was inside acceptable area, can be used to simple guided cannonball.