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
Hello.
Nils Faerber napisał(a):
There is all sorts of wacky stuff - for example, peer-peer DGPS that can
be done, where all stationary neos on charge with a GPS signal and a
free internet connection contribute to a global ionospheric model.
Then any Neo can connect to this model, download 200
2007/3/9, Bartlomiej Zdanowski AutoGuard Ltd. [EMAIL PROTECTED]:
I asked my colleagues who are GPS devices specialists and they said that
this is all wrong.
Did they talked about AGPS (http://wiki.openmoko.org/wiki/Hardware:AGPS)?
cayco
___
Krzysztof Kajkowski napisał(a):
2007/3/9, Bartlomiej Zdanowski AutoGuard Ltd. [EMAIL PROTECTED]:
I asked my colleagues who are GPS devices specialists and they said
that
this is all wrong.
Did they talked about AGPS (http://wiki.openmoko.org/wiki/Hardware:AGPS)?
They did about technology
Al Johnson napisał(a):
On Friday 09 March 2007 08:58, Bartlomiej Zdanowski AutoGuard Ltd. wrote:
You cannot depend on GPS reading to count quite accurate velocity,
acceleration and accurate position. Sorry.
Conventionally this is true, but there are other ways. IIRC RaceLogic use the
On Friday 09 March 2007 09:58, Bartlomiej Zdanowski AutoGuard Ltd. wrote:
To get *any* GPS reading device must see 3 satellites but you cannot be
Actually, for a single location fix, you need four. With 3 sources you can
still have 2 spots on the surface of the Earth that can match up (some GPS
Ian Stirling napisał(a):
Bartlomiej Zdanowski AutoGuard Ltd. wrote:
Hello.
Nils Faerber napisał(a):
There is all sorts of wacky stuff - for example, peer-peer DGPS
that can
be done, where all stationary neos on charge with a GPS signal and a
free internet connection contribute to a global
Bartlomiej Zdanowski AutoGuard Ltd. wrote:
Ian Stirling napisał(a):
Bartlomiej Zdanowski AutoGuard Ltd. wrote:
Hello.
Nils Faerber napisał(a):
There is all sorts of wacky stuff - for example, peer-peer DGPS
that can
be done, where all stationary neos on charge with a GPS signal and a
free
On Friday 09 March 2007 11:43, Bartlomiej Zdanowski AutoGuard Ltd. wrote:
Ian Stirling napisał(a):
Bartlomiej Zdanowski AutoGuard Ltd. wrote:
Hello.
Nils Faerber napisał(a):
There is all sorts of wacky stuff - for example, peer-peer DGPS
that can
be done, where all stationary neos
Bartłomiej Zdanowski DRP AC2
[EMAIL PROTECTED] writes:
I work for company that develops devices for car and person tracking. We
do the stuff as written above to correct GPS readings.
A car that is parked in front of our office equipped in GPS receiver
collects data about it position. Even if
On Fri, 2007-03-09 at 12:46 +, Al Johnson wrote:
...
So *military* devices does it. But not civil.
This is for *civil* devices.
http://pro.magellangps.com/en/products/aboutgps/dgps.asp
http://pro.magellangps.com/en/products/aboutgps/rtk.asp
Philip Ray Schaffner wrote:
On Fri, 2007-03-09 at 12:46 +, Al Johnson wrote:
...
So *military* devices does it. But not civil.
This is for *civil* devices.
http://pro.magellangps.com/en/products/aboutgps/dgps.asp
http://pro.magellangps.com/en/products/aboutgps/rtk.asp
Ian Stirling schrieb:
Nils Faerber wrote:
Hi!
I am interested in doing a little research on the AGPS part. As far as I
understood the used Hammerhead chip will dump out the more or less raw
GPS data into userland which will then need to be post-processed in
order to get the usual NMEA or
Nils Faerber wrote:
Ian Stirling schrieb:
Nils Faerber wrote:
Hi!
I am interested in doing a little research on the AGPS part. As far as I
understood the used Hammerhead chip will dump out the more or less raw
GPS data into userland which will then need to be post-processed in
order to get the
Nils Faerber skrev:
Exactly.
Also relative positioning can be made much more precise using the raw
data (AFAIK in the range of cm not m).
Wow! If this is true, speed and direction can be fairly accurate
calculated even at low speed.
This makes orienting a map with the moving direction
Message: 10
Date: Thu, 08 Mar 2007 13:19:40 +
From: Ian Stirling [EMAIL PROTECTED]
The gpsd will output assorted parameters, including current position, ...
You can take this - or even output from a nearby (1m) GPS, and the
bitstream input and output to the GPS chip, and try to work out
Still confused on the term nearby GPS
Marty
Ian Stirling wrote:
Martin Lefkowitz wrote:
Message: 10
Date: Thu, 08 Mar 2007 13:19:40 +
From: Ian Stirling [EMAIL PROTECTED]
The gpsd will output assorted parameters, including current
position, ...
You can take this - or even output from
Martin Lefkowitz wrote:
Still confused on the term nearby GPS
A completely separate GPS unit, that is nearby, close in location, with
almost the same position, ...
Its only purpose is to measure the GPS coordinates - lat, long, time,
from which can be derived the satellite signals sent to
On Thursday 08 March 2007 20:18:50 Ian Stirling wrote:
A completely separate GPS unit, that is nearby, close in location, with
almost the same position, ...
Its only purpose is to measure the GPS coordinates - lat, long, time,
from which can be derived the satellite signals sent to the neo.
Gabriel Ambuehl wrote:
On Thursday 08 March 2007 20:18:50 Ian Stirling wrote:
A completely separate GPS unit, that is nearby, close in location, with
almost the same position, ...
Its only purpose is to measure the GPS coordinates - lat, long, time,
from which can be derived the satellite
OK, now I was the perpetrator of imprecise language. How do the two
neo's communicate with each other -- the one that can see the GPS signal
and the one that can't?
Marty
Ian Stirling wrote:
Martin Lefkowitz wrote:
Still confused on the term nearby GPS
A completely separate GPS unit,
Martin Lefkowitz writes:
OK, now I was the perpetrator of imprecise language. How do the two
neo's communicate with each other -- the one that can see the GPS signal
and the one that can't?
Not two NEOs -- one NEO and one GPS receiver that's used to get known
data. Try to correlate the
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