采用扩展卡尔曼滤波器对GPS信号进行状态估计滤波，实现对状态的鲁棒跟踪，可用于目标跟踪、系统自动控制、惯性导航、组合导航等领域-extended kalman filter is used to state estimation of information of GPS signal, performing robust, prefering applied to target tracking(object tracking), automation, ins navigation