Re: CENTIMETER-LEVEL GPS ORBIT ACCURACY ATTAINED BY NGS
- From: SamSvL <samsvl@xxxxxx>
- Date: Wed, 24 Jan 2007 09:08:17 +0100
Hi Francesco,
I guess a few meters.
Sam (the other)
"frder" <frder@xxxxxxxxx> wrote in
news:1169621929.003831.60870@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
As I understand those orbit data will be used for post-processing.
How much precise are the actual orbit data broadcasted by the gps
satellites in real time?
francesco
On 22 Gen, 19:15, Sam Wormley <sworml...@xxxxxxxxx> wrote:
January 22, 2007
CENTIMETER-LEVEL GPS ORBIT ACCURACY ATTAINED BY NGS
The daily GPS orbit solutions generated by NOAA's National Geodetic
Survey for high-accuracy positioning applications have recently
attained a new level of accuracy, approaching 1 cm. The satellite
ephemerides are generated using a global network of more than 150
stations every day and released within 17 hours. The work is done
in collaboration with other analysis groups of the International GNSS
Service (IGS), which also coordinates the global tracking network.
Over the past year, numerous model upgrades and strategy changes have
been applied in the GPS data analysis bringing the daily RMS orbit
errors down to about 2 cm. On 17 January 2007, the orbits did even
better, at about 1 cm, as a new network strategy was implemented.
(For information contact Jim....@xxxxxxxx)
.
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