Establishment of Three-Dimensional Geodetic Control by Interferometry with the Global Positioning System

摘要

We consider the theoretical and the practical aspects of using radiointerferometric observations of the GPS satellites to establish a three-dimensional, multistation, geodetic control network. We discuss various ways of processing GPS data and try them with observations from a 35-station network in Germany. We examie the reproducibility of interferometric determinations of individual baseline vectors and the three-dimensional vector closure of subnetworks and the whole network. We compare these measures of precision with corresponding predictions based on statistics of interferometric phase residuals. We conclude that the relative positions of stations in the network were determined by GPS interferometry within about 1 part per million (ppm) in both horizontal coordinates and about 1.6 ppm in the vertical. The accuracy of regional control by GPS should improve to about 0.1 ppm when interferometry is also used to determine the satellite orbits.