The permanent GPS network of the International GPS Service for Geodynamics (IGS) provides a global data set of precise GPS measurements, which is invaluable in the development of algorithms and software for very high accuracy GPS positioning. The intensive EPOCH'92 campaign expanded the core network to include densification in many regions of the world. This project has involved the analysis of data from the Brazilian GPS network, with selected connections to the IGS Global Network. In this preliminary report we discuss the initial data processing, demonstrating a level of relative positioning accuracies of better than 10 ppb in height differences, typically the worst positional component. Besides the normal standard used in the processing of a GPS network, it involved an Earth body tide model.
GPS; Precise ephemerides; Earth body tide model
