ubuntu-phone team mailing list archive

[Thomas Voß <thomas.voss@xxxxxxxxxxxxx>]

Hey all,

thanks for the great script, I will make sure that we fold the color
coding capabilities into the client executable of the location
service.
As far as I can see, "green" indicates that the snr exceeds a certain
threshold (11 in the awk script). While snr is an interesting value,
the more interesting information is "used_in_fix", "has_almanac_data"
and "has_ephimeris_data". Even if multiple satellites are visible
(with a sensible snr), only
those for which almanac and ephimeris data is known are considered for
calcucating the fix. http://en.wikipedia.org/wiki/Time_to_first_fix
provides a good overview.

With that, green should probably refer to satellites that have
"used_in_fix" set to 1.

The theoretical minimum for a first fix after cold start is 12.5
minutes, which is rarely the case and ttf usually takes longer in cold
start scenarios.
We take multiple measures to minimize this time, but it seems like we
are experiencing issues in doing so. It would be really helpful if you
could provide the output of:

    sudo GLOG_v=1000 GLOG_logtostderr=1 ubuntu-location-serviced-cli
--bus system --test

Feel free to share privately with me as the logs would reveal your
position. Source for the test is in [1].
Please note that you should restart your device after the test has
been completed.

Thanks a lot & once again thanks for the scripts,

  Thomas

[1] http://bazaar.launchpad.net/~phablet-team/location-service/trunk/view/head:/src/location_service/com/ubuntu/location/service/runtime_tests.cpp#L74

On Sat, Apr 25, 2015 at 9:34 PM, Ed Kapitein <ed@xxxxxxxxxxxx> wrote:
> Your welcome!
>
> I placed a new tarball at the same url, that will show the green satelites
> on top and the red ones at the bottom.
> Feel free to test it.
> I have 9 visible satellites outside, and still no fix ?!?!
> I hope the next OTA update will fix this.
>
> The web page will reload itself every once a minute, feel free to tweak the
> refresh value in the awk file.
>
> Kind regards,
> Ed
>
>
> On 04/25/2015 09:12 PM, Matthias Apitz wrote:
>>
>> El día Saturday, April 25, 2015 a las 05:40:32PM +0200, Ed Kapitein
>> escribió:
>>
>>> I wrote a little script, that will convert the info of the satellites
>>> into a web page,
>>> which you can view on the BQ itself.
>>> ( landscape works best )
>>>
>>> -1 download the tarball at http://www.kapitein.org/sats.tgz
>>> -2 extract it in the homedir of phablet ( /home/phablet )
>>> -3 run the script: /home/phablet/scripts/gps/scripts/sats2html.sh &
>>> -4 after a minute, open the browser and point it to
>>> file:///dev/shm/sats.html
>>>
>>> I hope this will help someone.
>>
>> I have installed and tested it: works fine, at least I have a table of
>> red values of satellites (I'm sitting inside, outside it's raining) :-)
>>
>> I will map the command to start the script on some F-key in the
>> terminal-app, but not in background, because it would cause a constant
>> power-drain.
>>
>> Btw: What is the best way in the BQ browser of page reload?
>> Thanks
>>
>>         matthias
>>
>
>
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