how is GPS ephemeris data derived from predicted orbit?
  
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how is GPS ephemeris data derived from predicted orbit?

 
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MikeLee
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Posted: Fri Nov 25, 2005 5:08 pm    Post subject: how is GPS ephemeris data derived from predicted orbit? Reply with quote
The ICD-200C document contains tranformation formulas to calculate
position of a GPS satellite at a particular instant using ephemeris
data downloaded from the GPS signal.

How was the ephemeris data derived from the predicted GPS satellite
orbit by the control segment? Does anyone know if there is any
reference giving information on how the predicted orbit was fitted to
the transformation model, with ephemeris data as the unknown parameter
to be calculated?

Thanks in adavance for your help.



Mike
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Sam Wormley
Guest
Posted: Fri Nov 25, 2005 11:45 pm    Post subject: Re: how is GPS ephemeris data derived from predicted orbit? Reply with quote
MikeLee wrote:
Quote:
The ICD-200C document contains tranformation formulas to calculate
position of a GPS satellite at a particular instant using ephemeris
data downloaded from the GPS signal.

How was the ephemeris data derived from the predicted GPS satellite
orbit by the control segment? Does anyone know if there is any
reference giving information on how the predicted orbit was fitted to
the transformation model, with ephemeris data as the unknown parameter
to be calculated?

Thanks in adavance for your help.



Mike


From "Principles and Practice of GPS Surveying"
http://www.gmat.unsw.edu.au/snap/gps/gps_survey/principles_gps.htm

BROADCAST EPHEMERIS DATA
http://www.gmat.unsw.edu.au/snap/gps/gps_survey/chap3/333.htm
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Martin Potter
Guest
Posted: Sun Nov 27, 2005 8:09 am    Post subject: Re: how is GPS ephemeris data derived from predicted orbit? Reply with quote
"MikeLee" (mikelee_314@yahoo.com) writes:
Quote:

How was the ephemeris data derived from the predicted GPS satellite
orbit by the control segment? Does anyone know if there is any
reference giving information on how the predicted orbit was fitted to
the transformation model, with ephemeris data as the unknown parameter
to be calculated?


As I understand it, it might be more correct to ask how the satellite
orbit is predicted from the observationally-derived ephemeris data.
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