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- First-two-Galileo-IOV-reach-operating-orbit
- 11-28-2011
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http://www.gpsworld.com/gnss-system/galileo/news/galileo-iov-satellites-rea=
ch-operating-orbits-12340
An announcement from ESA on November 4 stated "Europe=92s first two
Galileo IOV satellites have reached their final operating orbits,
opening the way for activating and testing their navigation payloads."
But, based on NORAD/JSpOC tracking of the satellites, it seems that
the final orbits were achieved only a day or so ago.
The plot above (and linked here) shows the mean motion (mm) of the PFM
and FM2 satellites since launch. As evidenced by the lengthy gaps in
the mm history, it is clear that NORAD/JSpOC sometimes has difficulty
in reacquiring satellites after delta-V manoeuvres. We do know,
however, that both satellites have appeared to reach their final
orbits sometime between November 19 and 23. The mm values are now very
close to the value 1.7046556 orbits per day derived from the mean
semimajor axis of the Galileo constellation as given in the Galileo
Open Service Signal-In-Space Interface Control Document: 29601.297 km.
The arguments of latitude of the two satellites, essentially in the
same orbit plane, are now 40 degrees apart as intended. There have not
been any public reports that navigation signals from the satellites
have yet been switched on.
Go Galileo ! Go ! Marcelo
ch-operating-orbits-12340
An announcement from ESA on November 4 stated "Europe=92s first two
Galileo IOV satellites have reached their final operating orbits,
opening the way for activating and testing their navigation payloads."
But, based on NORAD/JSpOC tracking of the satellites, it seems that
the final orbits were achieved only a day or so ago.
The plot above (and linked here) shows the mean motion (mm) of the PFM
and FM2 satellites since launch. As evidenced by the lengthy gaps in
the mm history, it is clear that NORAD/JSpOC sometimes has difficulty
in reacquiring satellites after delta-V manoeuvres. We do know,
however, that both satellites have appeared to reach their final
orbits sometime between November 19 and 23. The mm values are now very
close to the value 1.7046556 orbits per day derived from the mean
semimajor axis of the Galileo constellation as given in the Galileo
Open Service Signal-In-Space Interface Control Document: 29601.297 km.
The arguments of latitude of the two satellites, essentially in the
same orbit plane, are now 40 degrees apart as intended. There have not
been any public reports that navigation signals from the satellites
have yet been switched on.
Go Galileo ! Go ! Marcelo
On 2011-11-28 16:13 , macpacheco wrote:
Or they didn't plot the data following a dv and waited a couple weeks=20
for the satellite to reach its new orbit before plotting it. Doesn't=20
mean they lost the satellites.
Should be ample for validation.
Can't wait for my next Garmin with GPS, GLONASS, WAAS/EGNOS, Galileo -=20
maybe even Compass one day...
--=20
"I see!" said the blind man as he picked up his hammer and saw.
> http://www.gpsworld.com/gnss-system/galileo/news/galileo-iov-satellites=
-reach-operating-orbits-12340
> An announcement from ESA on November 4 stated "Europe=92s first two
> Galileo IOV satellites have reached their final operating orbits,
> opening the way for activating and testing their navigation payloads."
> But, based on NORAD/JSpOC tracking of the satellites, it seems that
> the final orbits were achieved only a day or so ago.
> The plot above (and linked here) shows the mean motion (mm) of the PFM
> and FM2 satellites since launch. As evidenced by the lengthy gaps in
> the mm history, it is clear that NORAD/JSpOC sometimes has difficulty
> in reacquiring satellites after delta-V manoeuvres. We do know,
> Galileo IOV satellites have reached their final operating orbits,
> opening the way for activating and testing their navigation payloads."
> But, based on NORAD/JSpOC tracking of the satellites, it seems that
> the final orbits were achieved only a day or so ago.
> The plot above (and linked here) shows the mean motion (mm) of the PFM
> and FM2 satellites since launch. As evidenced by the lengthy gaps in
> the mm history, it is clear that NORAD/JSpOC sometimes has difficulty
> in reacquiring satellites after delta-V manoeuvres. We do know,
Or they didn't plot the data following a dv and waited a couple weeks=20
for the satellite to reach its new orbit before plotting it. Doesn't=20
mean they lost the satellites.
> however, that both satellites have appeared to reach their final
> orbits sometime between November 19 and 23. The mm values are now very
> close to the value 1.7046556 orbits per day derived from the mean
> semimajor axis of the Galileo constellation as given in the Galileo
> Open Service Signal-In-Space Interface Control Document: 29601.297 km.
> The arguments of latitude of the two satellites, essentially in the
> same orbit plane, are now 40 degrees apart as intended. There have not
> orbits sometime between November 19 and 23. The mm values are now very
> close to the value 1.7046556 orbits per day derived from the mean
> semimajor axis of the Galileo constellation as given in the Galileo
> Open Service Signal-In-Space Interface Control Document: 29601.297 km.
> The arguments of latitude of the two satellites, essentially in the
> same orbit plane, are now 40 degrees apart as intended. There have not
Should be ample for validation.
> been any public reports that navigation signals from the satellites
> have yet been switched on.
> have yet been switched on.
Can't wait for my next Garmin with GPS, GLONASS, WAAS/EGNOS, Galileo -=20
maybe even Compass one day...
--=20
"I see!" said the blind man as he picked up his hammer and saw.
