详情

原文传递 GPS Results from State-Wide High Precision Networks in the United States.

题名：	GPS Results from State-Wide High Precision Networks in the United States.
作者：	Foote, R. H.; Hall, L. W.; Love, J. D.; Soler, T.
关键词：	Computer Software; Data Collection; Gps Devices; Navigation Systems; Networks
摘要：	The Global Positioning System (GPS) is being used at NOAA's National Geodetic Survey (NGS) to establish very precise geodetic networks with relative accuracies ranging between 0.1 ppm (A-order) and 1 ppm (B-t>rder). The final quality of these GPS networks is investigated by analyzing their internal as well as external consistencies. The latter, or absolute, accuracy is determined by connecting preselected (A-order) marks to known Cooperative International GPS Network (CIGNET) fiducial points whose coordinates are rigorously known in the International Earth Rotation Service (IERS) terrestrial reference frame ITRF 89. Doubledifference observables collected from this A-order reference framework are reduced applying orbital improvement techniques based on precise ephemerides. Finally, comparisons of Cartesian coordinates between A-order points collocated with an independent set of VLBI antennas, give an estimate of the accuracy presently attainable with GPS procedures. This accuracy, in tum, is propagated to the statewide B-order networks through a constrained least squares adjustment fixing the common A- and B-order points to the A-order coordinates. Updated results, procedures, and the high levels of precision and accuracy of several regional and statewide networks are presented.
报告类型：	科技报告