Abstract :
For three weeks from January 18 to February 5 of 1988, the most extensive international GPS experiment to date was successfully conducted involving 15 countries, over 30 international institutions and universities, and 43 GPS reoeivers. Global coverage of GPS observations spanned 220/spl deg/ of longitude and 125/spl deg/ in latitude. The experiment was the first civilian effort at implementing an extended international GPS satellite tracking network. The predicted improvement in precise orbit determination is crucial for accurate long baseline geodesy. The collaborative experiment called "CASA UNO" (an acronym for Central and South America, the first experiment), was coordinated and managed by NASA\´s Jet Propulsion Laboratory, under the Geodynamics Program.
