Real-time GPS and GLONASS processing: the G2 service - IGS
Real-time GPS and GLONASS processing: the G2 service - IGS
Real-time GPS and GLONASS processing: the G2 service - IGS
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<strong>Real</strong>-<strong>time</strong> <strong>GPS</strong> <strong>and</strong> <strong>GLONASS</strong> <strong>processing</strong>:<br />
<strong>the</strong> <strong>G2</strong> <strong>service</strong><br />
J. Tegedor, L. Agrotis<br />
F. Pereira, R. Z<strong>and</strong>bergen<br />
T. Melgard, E.Vigen<br />
<strong>IGS</strong> Workshop 2010<br />
Newcastle<br />
29 Jun 2010
System description<br />
What is <strong>G2</strong>?<br />
– Commercial augmentation system designed to provide worldwide high<br />
accuracy positioning using both <strong>GPS</strong> <strong>and</strong> <strong>GLONASS</strong><br />
– System developed by Fugro Seastar in cooperation with ESA/ESOC<br />
• Fugro expertise in real-<strong>time</strong> navigation<br />
• ESA/ESOC expertise in high accuracy GNSS <strong>processing</strong><br />
– System fully operational since<br />
2009<br />
– High availability <strong>and</strong> robustness<br />
More than 50 satellites used for<br />
– More than 50 satellites used for<br />
precise positioning!
System architecture<br />
System elements:<br />
– Dedicated dual-frequency reference station network<br />
– Orbit & Clock <strong>processing</strong> servers<br />
– Uplink stations<br />
– Signal broadcast over 10 geostationary satellites<br />
– <strong>G2</strong> user receiver: combines <strong>GPS</strong>, <strong>GLONASS</strong> <strong>and</strong> <strong>G2</strong> corrections
Orbit <strong>and</strong> Clock generation<br />
– <strong>G2</strong> corrections are <strong>the</strong> result of:<br />
– Batch orbit process<br />
– <strong>Real</strong>-<strong>time</strong> Kalman Filter<br />
– Accuracy of real-<strong>time</strong> <strong>G2</strong> orbit <strong>and</strong><br />
clocks (compared against ESA <strong>IGS</strong><br />
final products):
Orbit <strong>and</strong> Clock accuracy<br />
– From <strong>the</strong> user st<strong>and</strong>point, <strong>the</strong> accuracy of both orbit <strong>and</strong> clock in <strong>the</strong> range<br />
domain is determining <strong>the</strong> final position accuracy (URE=user range error)<br />
– User range error of <strong>G2</strong> real-<strong>time</strong> orbit-clocks compared with ESA <strong>IGS</strong> final<br />
products:
User accuracy<br />
– <strong>Real</strong>-<strong>time</strong> system performance<br />
for a <strong>G2</strong> receiver located at<br />
Oslo (6 th June 2010):<br />
• The accuracy of <strong>GLONASS</strong><br />
only kinematic PPP solution is<br />
remarkable, despite of lack of<br />
coverage some parts of <strong>the</strong><br />
day<br />
• <strong>GPS</strong> <strong>and</strong> <strong>GLONASS</strong> combined<br />
offers <strong>the</strong> best possible<br />
solution, due to enhanced<br />
geometry <strong>and</strong> satellite<br />
visibility<br />
– Horizontal accuracy <strong>GPS</strong> <strong>and</strong><br />
<strong>GLONASS</strong> 95% < 10 cm
Thank you for your attention!<br />
For fur<strong>the</strong>r information, please visit:<br />
http://www.fugroseastar.no
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