WVR and Multipath Corrections for High Accuracy GPS

全球定位系统（GPS）已经成熟，可以实现0.1 ppm或更高的相对定位精度。限制这种精度的其他误差源有：(a) GPS信号所遭受的湿对流层路径延迟和(b)多路径反射。为了研究这些误差和减少误差的方法，pi将在科罗拉多州进行GPS基线实验。他们将研究湿对流层的方位角变化对确定GPS基线的影响。为了研究这种效应，有必要抑制可能掩盖对流层变化的多径误差。

The Global Positioning System (GPS) has matured to achieve relative positioning accuracies of 0.1 ppm or better. Remaining error sources that limit this accuracy are: (a) the wet tropospheric path delay suffered by the GPS signal and (b) multipath reflections. The PIs will run a GPS baseline experiment in Colorado in order to study both these errors and methods of reducing them. They will investigate the effect of azimuthal variations of the wet troposphere on the determination of GPS baselines. In order to study this effect it is necessary to suppress multipath errors that might mask the tropospheric variations.