[Openstreetmap] Re: EGNOS DGPS

[Schuyler Erle]

* On 29-Apr-2005 at  3:57PM PDT, Petter Reinholdtsen said:
> 
> The accuracy is improved, but not revolutionary.  I've been told that
> the reliability has been improved too.  With EGNOS enabled, it is
> possible to detect when the GPS position don't make sense.  I have not
> verified that this is the case.

Also, you need a separate EGNOS receiver (or a really expensive GPS
receiver) *and* a serial cable splitter if you also want to read data
off the GPS while the EGNOS receiver is feeding it corrections.
Practically speaking, if your receiver interprets WAAS signals (and
there's a WAAS satellite overhead, which there often isn't at this
latitude, sadly), then adding EGNOS is probably overkill. Nice
thought, though. DGPS-over-IP is certainly cheaper, if you can get it.

Also, you can often detect when GPS positions don't make sense after
the fact by sanity-checking the velocity travelled between two track
points.

SDE