| |
Numerical Weather Predictionb
|
Space Weather
|
Climatology
|
Geophysicsc
|
|
Receiver Sample Rate
|
30 seconds (ground)
|
30 seconds
|
30 seconds
|
30 seconds
|
|
Predicted Orbit Accuracy
|
<25 cm
|
30 cm
|
10 cm
|
50 cm (real time) 10 cm (long term)
|
|
Orbit Access/Delivery Time
|
Available at 00:00 universal coordinated time (UTC) each day
|
0.5 hours
|
Not defined
|
Real-time continuous delivery (real time) 1 week (long term)
|
|
Required Data Product
|
Total signal delay (ground-based) Bending angle (space-based)
|
Total electron content
|
Precipitable water vapor solution (30 minute intervals)
|
Position differences, covariance, and variance over baselines <500 km
|
|
Data Access/Delivery Time
|
0.5 hours for local models <5.0 hours for global models
|
0.5 to 1.0 hours
|
6 months
|
30 seconds (real time) Not defined (long term)
|
|
Accuracy
|
<1 cm
|
2 to 5 total electron content units
|
1 to 2 mm
|
5 mm (real time) 1 mm (long term)
|
|
Spatial Distribution of Reference Stations
|
500 km globally <200 km locally (ground) <500 km (space)
|
Global network with emphasis on low latitude sites
|
Not defined
|
3 to 50 km
|
|
a The quantitative and qualitative requirements listed in this table were determined by the remote sensing working group. They do not represent requirements defined by an internationally recognized standardization committee or a government agency.
b Where they have been defined, requirements are listed for both ground-based and space-based GPS sensing systems.
c Requirements for both real-time and long-term geophysical applications are provided. If only one entry is present, the requirements are the same for both.
|
