GPS

[Russell Sears]

I played with it a bit more and think i figured out why i wasn't getting 
locks quickly.  It looks like my Freerunner's GPS is working after all! :)

I've updated the wiki GPS_Problems page with some basic information 
about how GPS devices obtain initial locks, and added more 
troubleshooting information...  It would have saved me a few hours; 
hopefully someone else will find it useful.  Someone familiar with GPS 
should probably check it for errors.  Most of what I wrote is based on 
things I learned today by word-of-mouth and skimming wikipedia articles.

-Rusty

Russell Sears wrote:
> This might help too (I should add myself to it...):
> 
> http://wiki.openmoko.org/wiki/GPS_Problems
> 
> I've only gotten a fix using the agps diagnostic tool gui.  I did it in 
> the middle of a clear night with nothing near by, by going to the signal 
> strength screen, and slowly rotating the phone until the bars started 
> turning from light blue to dark blue, and going with an orientation that 
> seemed to work, kind of like with an old analog TV set...
> 
> I don't know if doing it actually helped, but while playing this game, I 
> got a fix in ~ 2-3 minutes, vs the tens of minutes I'd waited before that.
> 
> Bumble, after 10-15 minutes of waiting, do you see any satellites in the 
>   "ss" tab of the agps diagnostic tool?  Does it display a time in UTC 
> after a few minutes?  If so, we're probably in the same boat.
> 
> Is there a document explaining the exact handshaking procedure the 
> chipset in the freerunner uses to lock onto the satellites?
> 
> -Rusty
> 
> andres wrote:
>> On Fri, 2008-07-11 at 23:57 +0200, Bumbl wrote:
>>
>>> Be happy
>>> I have never got a fix up to now although trying on different locations 
>>> for >45min each.
>>> I'll consider to use my waranty.
>> probably this is related
>> http://wiki.openmoko.org/wiki/FreeRunner_GPS_antenna_repair_SOP
>>
>>
>>
>>
>>
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