Work Package 3 (WP3): Orbits and Clock Transformation Modeling


 
WP3 Leader - Professor Marek Ziebart
WP3 Research Fellow -
WP3 PhD Student - Mr. Santosh Bhattarai


WGS84 reference frame
 
Galileo Terrestrial Reference Frame
 
Figure 1) WGS84 reference frame stations and its horizontal velocity field for epoch 2001 showing the plate motion. In the latest WGS84 there are 6 U.S. Air Force stations plus 11 NGA stations. It is the reference frame of the GPS system and is realised based on GPS. Its latest realistion is aligned to ITRF2000 at a few cm to a dm level.
 
Figure 2) Galileo Terrestrial Reference Frame (GTRF) stations and its horizontal velocity field for epoch 2009 showing the plate motion. A total of 145 mixed IGS and Galileo Sensor Stations (GSS) are used to realised GTRF using all the avialable space geodetic techniqes. It is aligned to latest ITRF at the precision of 3 cm (2 sigma).

 


WGS84 reference frame
 
Galileo Terrestrial Reference Frame
 
Figure 3) International GNSS Services (IGS) 2005 reference frame stations and its horizontal velocity field for date 11-Sep-2010 showing the plate motion.
 
Figure 4) International Terrestrial Reference Frame (ITRF) 2008 realisation stations and its horizontal velocity field.

 


GNSS systems Reference Timescales
Table 1) Brief information on GNSS Reference Timescales.

 

Enhanced GNSS satellite clock modelling and relativistic effects



Allan deviation of GPS Satellite clocks
Figure 1) Frequency Stability Analysis using Allan deviation of IGS Final clock combinations for all available GPS satellites.

 

 

© Copyright iNsight

 

Page maintained by iNsight Research Fellows (e-mail)           Updated April 2011