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List:       gpsd-dev
Subject:    Re: [gpsd-dev] [PATCH 7/9] Correctly define autonomous and A-GPS mode
From:       Paul Fertser <fercerpav () gmail ! com>
Date:       2015-04-19 14:51:22
Message-ID: 20150419145122.GD24018 () home ! paul ! comp
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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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mailto:fercerpav@gmail.com

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