基于伪陀螺/磁强计/地球敏感器的微卫星姿态自适应确定方法

以伪陀螺、磁强计与地球敏感器构成的姿态测量系统为基础,设计了自适应扩展卡尔曼滤波算法.对轨道倾角不同的两种卫星的定姿性能进行了仿真,结果表明,该方案的滚动与俯仰角精度达到0.05°,航向角优于0.4°,且随轨道倾角的减小而改善;当地球敏感器发生故障时,大倾角轨道的卫星滚动与俯仰角精度优于0.5°,航向精度约1°;同时自适应滤波方法能显著地提高姿态确定的性能.

Adaptive Determination of Micro-satellite Attitude Using Pseudo Gyro, Magnetometer and Earth Sensor

Attitude determination is a key that affects the performance of a micro satellite platform.An adaptive extended Kalman filtering algorithm is presented in this paper for attitude determination consisting of a pseudo gyro, a magnetometer and an earth sensor.Attitude determination performance of a satellite on two orbits with different inclination is studied by simulation.The results indicate that roll and pitch accuracy is about 0.05ånd heading accuracy is better than 0.4°.The accuracy is improved as inclination decreases.When the earth sensor fails, roll and pitch accuracy of the satellite on the orbit with large inclination is better than 0.5°, and heading accuracy is about 1°.The adaptive Kalman filter can evidently enhance attitude determination performance.