GPS

[Jonathan Spooner]

I've been playing with my GPS and finally got a fix using agps diag 
tool. I stood the gta02 up on my garden table using a pop bottle :-)  I 
think bottom line the gta02 has a poor antenna.... in fact the first 
time I got a fix I did so at the point I rested my free stylus on top of 
the gta02!

Once I had a fix I used the signal strength screen in the agps diag tool 
and its then plain to see the signal is precarious at best with an 
average strength of around 28 which is greatly affected by orientation 
and nearby objects from hands, stylus, people etc pretty much what you'd 
expect in a device thats receiving a very weak signal.... except we know 
the say system is working so that only leaves the gta02 internal antenna 
as the problem.

Thoughts?

Jon



Russell Sears wrote:
> 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
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> Openmoko community mailing list
>>> community at lists.openmoko.org
>>> http://lists.openmoko.org/mailman/listinfo/community
>>>       
>> _______________________________________________
>> Openmoko community mailing list
>> community at lists.openmoko.org
>> http://lists.openmoko.org/mailman/listinfo/community
>>     
>
>
> _______________________________________________
> Openmoko community mailing list
> community at lists.openmoko.org
> http://lists.openmoko.org/mailman/listinfo/community
>