AGPS - protocol specs?

[Timo Juhani Lindfors]

On Fri Mar 9 13:46:19 CET 2007, Al Johnson wrote:
> Here's a civil device using RTK that "determines the position to
> centimeter accuracy within a few seconds at ranges up to 50 km from
> a reference station"

Sounds like an interesting challenge. At least rtklib 2.4.0 was unable
to resolve the integer ambiguity problem (?) when I extended the
baseline to about 30 km.

Would be nice to know if this is due to my cheap antenna, finnish
weather, a problem in rtklib or something completely different. (Yes,
I did turn off all radio transmitters during the tests and ran from
battery power only).