[hafqa] [hafqa] [Bug 2878] Very poor satellite acquisition with internal GPS

[From: bugzilla-daemon at maemo.org]

https://bugs.maemo.org/show_bug.cgi?id=2878





------- Comment #22 from maemo at subs.maneos.org  2008-07-10 18:33 GMT+3 -------
Just a bit of empirical info (any pointers to documentation on how it's
supposed to work appreciated):

The AGPS problem seems to be supld getting stuck.  Based on observation it gets
started by dbus and should normally live just long enough to fetch the
almanac/ephemeris data and feed it to the GPS chip, but sometimes it doesn't
exit so subsequent GPS "sessions" can't start a new one and don't get AGPS.

A tell-tale symptom of this happening is when the N810 doesn't know the list of
visible satelites at GPS app (mapper, maps etc) startup time and has to
discover them on its own.  When it is working maemo mapper should display 0/n
(for large values of n) in the GPS info pane as soon as the "Establishing GPS
fix" notification appears.  When it is not you get 0/0 instead, which slowly
increases as satellite data is downloaded from the satellites themselves.
So far this has been fixable by killing the stuck supld and restarting the GPS
application.

Reception is acceptable, but still not as good as with an LD-3W over bluetooth,
even when starting "cold" (AFAICT AGPS can't help in this case, right?).  The
built-in GPS reports weaker signal, often sees fewer satellites and has a lot
more jitter once a fix has been acquired (the location & direction stay pretty
much fixed with the LD-3W while with the internal one they constantly jump all
over the place).  Is this a hardware limitation or is there still room for
improvement?


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