Re: EGNOS now sending ranging data?

Carsten Kurz wrote:

>
> GSV Three Minds in a Can schrieb:
>
>>At least three times today, for a period of several hours, I got a
>>'solid bar' lock on PRN33, which I assumes means that my 60C thinks it
>>was getting usable ranging data as well as WAAS-type corrections (the
>>bar for 33 had a 'D' as well. 8>.)
>>
>>I guess they are playing with it.
>>
>>I also has intermittent reception (but hollow bar only) on PRN37 (!?).
>
>
> 33 is not EGNOS, but ESTB. And yes, their daily status msg confirms that
> they sometimes add ranging signals to AOR-E.
>
> 37 and 39 may carry all weird kinds of EGNOS signals, but they won't
> become Garmin compatible until the end of the year.
>
> Half of the ESTB RIMs infrastructure is now operating in Africa, the
> remaining 6 RIMS over Europe won't be able to sustain good corrections.
> Well, in your case, maybe the south of the UK would still benefit from
> the two RIMS in Rotterdam and Scilly Island.

Very interesting Carsten!

I am still seeing very nice ESTB data here in southern Norway, which
stations could be the cause of this (i.e. where are the remaining
generators of differential data?

This morning I started an additional hour of logging since I noticed
that sat #33 had ranging info again (this is only the second time I've
noticed it):

C:\DATA\Garmin MapSource>perl gpsstd.pl gps.2005-07-27
Average position (3559 points) = N 59.03929322 E 10.94127138

perc offset (m)
67 1.19
95 1.90
99 2.14
100 2.29

The average position is well within a meter from what I've previously
gotten, and the consistency is _very_ good. :-)

The average position after about two weeks of data collection from the
rooftop antenna is N 59.03928870 E 10.94126845 which would be about 60
cm from what I got this morning. I have never seen position data even
close to this good previously.

Over this entire period, I have only seen a single 7-second glitch,
where the position suddenly jumped about 31 meter, stayed there for 3
seconds, then returned.

If I remove 30 seconds of samples around this anomaly, the worst
remaining outlier from these two weeks is less than 4 m away.

Terje
--
- <Terje.Mathisen@xxxxxxxxxxxxx>
"almost all programming can be viewed as an exercise in caching"
.