利用GPS确定低轨道小卫星姿态

Attitude Determination of Low Orbit Small Satellite Using GPS

为了实现 GPS高精度确定低轨卫星姿态 ,提出了用广义卡尔曼滤波作为定姿算法。建立了 7维卫星姿态运动与 1 2维 GPS载波相位观测方程的离散线性化方程。比较分析了普通广义卡尔曼滤波 ( EKF)与迭代广义卡尔曼滤波 ( IEKF)算法对星载计算机的运算、存贮要求。对两种算法作了仿真计算表明 ,该算法可以达到较高的精度 。

To implement attitude determination using GPS, algorithm based on extended Kalman filter is developed. A seven dimension state equation and twelve dimension measurement equation model is constructed. The operations and storage resource requirements of two algorithms (EKF and IEKF) are analyzed. Simulation shows perfect precision can be got in SCM.