[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


advax at triumf.ca changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |advax at triumf.ca




------- Comment #6 from advax at triumf.ca  2008-04-27 07:19 GMT+3 -------
It appears that the GPS state is saved in /var/lib/gps/nvd_data.
A note in gpsinternal.h says "this might speed up the location fixes"

I did some tests starting and stopping the GPS.

If the file is present, the GPS can reacquire a fix in about 22 seconds
after a short period turned off.
If the file is deleted, it takes 180 seconds.
If the tablet clock is changed by about an hour, it takes about 80 seconds
to get a fix. Then 22 seconds to get a second fix with the clock still wrong.
When I changed the tablet clock by 40 days, it took 344 seconds one time
and 160 another (with satellites moving around, the fix times naturally vary
somewhat)

This suggests that having the clock a bit wrong is not a big deal. However,
having it a lot wrong has a more significant effect. 
It is possible that having a significantly stale nvd_data is worse than
not having one at all.

It would seem plausible that one could update nvd_data with an estimated
position in order to get a better TTFF


-- 
Configure bugmail: https://bugs.maemo.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the bug, or are watching the QA contact.