[OSM-talk] Quality of Sirf star 3 tracks disappointing...

[Andy Robinson]

As a follow up, you can find out a lot more up-to-date information on EGNOS
here:

http://www.asqf-gnss.com

Cheers,

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of Andy Robinson
>Sent: 11 July 2006 09:45
>To: 'Nick Black'; 'Barnett, Phillip'
>Cc: talk at openstreetmap.org
>Subject: RE: [OSM-talk] Quality of Sirf star 3 tracks disappointing...
>
>Yes, if you are seeing D's on the satellite bars when WAAS is enabled you
>are picking up the EGNOS (or WAAS) transmissions and the data for the
>satellite with the D is receiving corrections. On Garmin units. Sat 33, 37
>and 39 currently make up the EGNOS platform and normally two channels of
>the
>GPS receiver are reserved for two of these when SBAS (Satellite Based
>Augmentation System, ie WAAS or EGNOS) is enabled. WAAS and EGNOS do the
>same thing. Just that WAAS is for the Americas and EGNOS for Europe and
>Africa. The Japanese system is not up and running yet.
>
>The EGNOS platform is just this month moving from test mode to initial
>operations mode when the correction data should be available all the time.
>
>For more about SBAS check out this useful site:
>
>http://www.kowoma.de/en/gps/waas_egnos.htm
>
>Cheers,
>
>Andy
>
>Andy Robinson
>Andy_J_Robinson at blueyonder.co.uk
>
>>-----Original Message-----
>>From: talk-bounces at openstreetmap.org [mailto:talk-
>>bounces at openstreetmap.org] On Behalf Of Nick Black
>>Sent: 11 July 2006 09:31
>>To: Barnett, Phillip
>>Cc: talk at openstreetmap.org
>>Subject: Re: [OSM-talk] Quality of Sirf star 3 tracks disappointing...
>>
>>On 7/10/06, Barnett, Phillip <Phillip.Barnett at itn.co.uk> wrote:
>>>
>>>
>>>
>>> Yep, D's in the bars mean you're picking up WAAS/EGNOS signals from
>those
>>> satellites.
>>> Phillip
>>
>>I dont know exactly what the "D" means, but I dont think they mean
>>that the receiver is picking up EGNOS signals from NAVSTAR (GPS).
>>There are three satellites that currently make up the EGNOS system, in
>>geostaionary orbit so that they can broadcast over Europe.  The three
>>satallites really do very little (compared to a NAVSTAR, GLONASS or
>>GALILEO) satellite.  'All' they do is receive a broadcast signal from
>>European (ESA controlled) monitoring stations, and relay the signal
>>back to Earth, where it can be reiceived and understood by compatible
>>GPS receivers.
>>
>>The signal contains precise inforamtion about the orbit (ephemeris) of
>>GPS and GLONASS satellites, about ionospheric interference and about
>>the accuracy of the atomic clocks onboard the Navstar satellites. In
>>this way the system differs from Differential GPS and from A-GPS.
>>D-GPS works by 'averaging out' errors by placing a super accurate
>>receiver over a known position and relaying the differentials to a
>>less accurate reciever.  EGNOS is a lot more intelligent than that as
>>it deals with live data relating to various conditions.
>>
>>I am still uncertain whether I have ever picked up an EGNOS signal.  I
>>have a Garmin GPS 60 which, according to ESA
>>(http://esamultimedia.esa.int/docs/egnos/estb/SBAS_receivers.pdf)
>>isn't supported.  The manual however says the unit does support EGNOS
>>and WAAS.  I also noticed the "D"s the other day, when I was on a
>>south facing hill, so I dont think that its a coincidence.  I think
>>its more likely that the Ds mean that the reciever has picked up the
>>correction information for that satellite.  Anyone got anymore ideas?
>>
>>Nick
>>
>>
>>
>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: talk-bounces at openstreetmap.org on behalf of Jon Stockill
>>> Sent: Mon 7/10/2006 11:15 PM
>>> To: talk at openstreetmap.org
>>> Subject: Re: [OSM-talk] Quality of Sirf star 3 tracks disappointing...
>>>
>>> Lars Aronsson wrote:
>>>
>>> > With time and experience, I've come to use the satellite view
>>> > (showing signal strengths) on my Garmin while I'm moving around.
>>> > It's no point in running around if no signal is received.
>>>
>>> I was doing that at the weekend when I noticed little D's appear on all
>>> the signal strength bars on my GPS60 - this isn't mentioned in the
>>> manual, but I guess it means WAAS was working - because the error
>>> estimate shown at the top of the page dropped to 2m - definitely the
>>> most accurate coverage I've ever seen. Definitely a good upgrade from my
>>> old GPS12 - the screen is MUCH nicer, the battery life longer (on half
>>> the number of cells) and it'll store 10,000 trackpoints rather than
>>> 1024. Not only that, but I find it incredibly useful to save the tracks
>>> (after downloading of course) as it then gives you a reference on the
>>> map view for where you've already been.
>>>
>>> Jon
>>>
>>> _______________________________________________
>>> talk mailing list
>>> talk at openstreetmap.org
>>> http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
>>>
>>>
>>>
>>> Phillip
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: talk-bounces at openstreetmap.org on behalf of Jon Stockill
>>> Sent: Mon 7/10/2006 11:15 PM
>>> To: talk at openstreetmap.org
>>> Subject: Re: [OSM-talk] Quality of Sirf star 3 tracks disappointing...
>>>
>>> Lars Aronsson wrote:
>>>
>>> > With time and experience, I've come to use the satellite view
>>> > (showing signal strengths) on my Garmin while I'm moving around.
>>> > It's no point in running around if no signal is received.
>>>
>>> I was doing that at the weekend when I noticed little D's appear on all
>>> the signal strength bars on my GPS60 - this isn't mentioned in the
>>> manual, but I guess it means WAAS was working - because the error
>>> estimate shown at the top of the page dropped to 2m - definitely the
>>> most accurate coverage I've ever seen. Definitely a good upgrade from my
>>> old GPS12 - the screen is MUCH nicer, the battery life longer (on half
>>> the number of cells) and it'll store 10,000 trackpoints rather than
>>> 1024. Not only that, but I find it incredibly useful to save the tracks
>>> (after downloading of course) as it then gives you a reference on the
>>> map view for where you've already been.
>>>
>>> Jon
>>>
>>> _______________________________________________
>>> talk mailing list
>>> talk at openstreetmap.org
>>> http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
>>>
>>>
>>>
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