The precision is better. Please do not fill-in this field. Like the former IGS Predicted products, the Ultra-rapid products are available for real time and near real time use. All other orbit products contain strictly the 24 hours from Normally, the predicted orbits between 3 and 9 hours into the second half of each Ultra-rapid orbit file are most relevant for true real time applications. The standard deviation SDev values are computed by removing a separate bias for each satellite and station clock, whereas this is not done for the RMS values. They are made available on a daily basis with a delay of about 17 hours after the end of the previous observation day; i. 
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The next 24 hours of each file are predicted orbits, extrapolated from the observed orbits. They are made available on a weekly basis, by each Friday, with a delay up to 13 for the last day of the week to 20 for the filfs day of the week days.
IGS accuracy limits, except for predicted orbits, are based on comparisons with independent laser ranging results and discontinuities between consecutive days. Normally, the predicted orbits between 3 and 9 hours into the second half of each Ultra-rapid orbit file are most relevant for true real time applications.
GPS Satellite Orbits
The IGS Final products are the basis for the IGS reference frame and are intended for those applications demanding high consistency and quality. The precision is better.
The Ultra-rapid products are released four times per day, at The shorter latency should lead to significantly improved orbit predictions and reduced errors for user applications. The standard deviation SDev values are computed by removing a separate bias for each satellite and station clock, whereas this is not done for the RMS values. Please include the IGS logo and citation in all websites, presentations, publications, or posters that use IGS data, products, or services.
The accuracy neglecting any contributions from internal instrumental delays, which must be calibrated separately of all clocks is expressed relative to the IGS timescale, which is linearly aligned to GPS time in one-day segments.
IGS has decades of products that are archived which can be accessed through the ftp. All other orbit products contain strictly the 24 hours from These data sets are used by the IGS to generate the data products which are made available to interested users through this website. The orbits within each Ultra-rapid product file are, however, continuous at the boundary between the observed and predicted parts. Like the former IGS Predicted products, isg Ultra-rapid products are available for real time and near real time use.
The IGS collects, archives, and distributes GPS observation data sets of sufficient accuracy to satisfy the objectives of a wide range of applications and experimentation. Until week they were released twice daily.
CNES/CLS Analysis Center for IGS
At the time of release, the observed orbits have an initial latency of 3 hours. Please do not fill-in this field. They are made available on a daily basis with a delay of about 17 hours after the end of diles previous observation day; i. In this way the average age of the predictions is reduced to 6 hours compared to 36 hours for the old IGS Fikes products and 9 hours for the twice-daily Ultra-rapids.
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