一种气压高度表辅助GPS定位算法的研究

GPS单独完成定位需要至少4颗可见卫星提供导航数据,然而在某些应用场合,卫星信号可能被遮蔽或干扰,单独定位无法满足定位需求.为解决由于可观察的定位卫星数量不足无法完成定位解算的问题,采用气压高度传感器构造约束条件,引入了一种组合定位的气压高度表辅助GPS定位算法,给出了算法的迭代公式.仿真结果表明,该方法可以满足GPS信号受遮蔽条件下中等精度的定位需求,具有一定的实用价值.

Research on GPS positioning aided by barometric altimeter

For GPS location service,there are situations wherein the requirement of a minimum of four measurements is not satisfied because of obstructions to receiver-to-satellite line of sights.If such a situation arises in the middle of operation with three measurements,then altitude which is slowly varying with time can be held constant at its previously computed value(a mode called altitude hold).The solution of position and clock bias can be obtained using a direct method described here.But if initially after th...