IGS Hourly Data and Products for Near Realtime GPS/Met Applications

Peng Fang, Yehuda Bock, and Matthijs van Domselaar

Scripps Institution of Oceanography University of California, San Diego

Using IGS hourly data, SIO has been generating hourly orbits and EOP for nearly 
a year to support  the near realtime GPS/Met operation at  FSL/NOAA. Both hourly 
orbit generation and gps/met application use a sliding-window technique. The 
major advantage of estimating hourly orbits is to reduce the age of predicted 
part of the orbits in order to gain precision as well as soonest availability. 
The implementation details and the performances of such systems will be 
presented. Comparisons of  hourly orbit as well as perciple water estimates 
using hourly orbits show remarkable agreement with know best known estimates.