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Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode
From: |
Paul Fertser |
Subject: |
Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode |
Date: |
Sun, 19 Apr 2015 17:51:22 +0300 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hello,
On Fri, Apr 17, 2015 at 01:08:19PM -0400, Eric S. Raymond wrote:
> > Separately from the docs, it is an interesting question if any of the
> > common chipsets can accept A-GPS data, and if it makes sense for gpsd to
> > have support for fetching it from someplace and squirting it in.
>
> AGPS is swathed in impenetrable murk. I've been asking these same questions
> for years and not finding answers.
Here's some additional info from the Openmoko days regarding A-GPS: [1].
It seems we know enough (or almost enough) about Antaris 4 UBX
protocol to be able to convert and upload ephemerides and other
necessary data obtained from elsewhere. As already noted, A-GPS is not
that important nowadays as it used to be thanks to extreme sensitivity
and number of correlators in modern-day receivers.
[1]
http://wiki.openmoko.org/wiki/Neo_FreeRunner_GPS#GTA02_GPS_Hardware_Assist_Feature
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- [gpsd-dev] [PATCH 6/9] Correct definitions of cold start, warm start, etc, (continued)
- [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Sanjeev Gupta, 2015/04/17
- Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode, Greg Troxel, 2015/04/17
[gpsd-dev] [PATCH 8/9] Remove dead links., Sanjeev Gupta, 2015/04/17
[gpsd-dev] [PATCH 9/9] Remove lots of dead links., Sanjeev Gupta, 2015/04/17