基于EKF和自适应抗差滤波的星载GPS定轨方法

针对在星载GPS卫星定轨中由于卫星动力学模型误差和不可避免的观测异常严重影响定轨精度的问题,通过采用适当的自适应控制因子和应用抗差估计原理,构造自适应抗差扩展卡尔曼滤波(RAEKF)来实现星载GPS卫星定轨。实测计算表明,自适应抗差扩展卡尔曼滤波对观测误差和状态扰动有一定的抵制能力,与一般扩展卡尔曼滤波相比提高了精度,证明其理论的可行性。

Method of satellite-borne GPS orbit determination based on EKF and adaptive robust filter

The satellite dynamic model errors and the inevitable observation anomaly have a serious influence on the orbit determination accuracy of satellites based on GPS.An appropriate adaptive control factor and the robust estimation theory are used to establish an adaptive robust extended Kalman filter （AREKF） to complete the orbit determination of satellites based on GPS.The measured calculation shows that the adaptive robust extended Kalman filter serves a certain resistance against the observation error and state disturbance.The precision is improved and the feasibility of the theory compared with the standard extended kalman filter is verified.