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POWhat could be the cause for GPS issues of variable length during specific time intervals (periodic gps problems)?
 

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  1. POWhat could be the cause for GPS issues of variable length during specific time intervals (periodic gps problems)?
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    <p>I have developed an industrial geo-tracking application that runs daily. It uses GPS for long periods of time and requires accurate (GPS only) and frequent (~ every 5 sec) updates.</p> <p>Although this app is running on multiple identical hardware models (Samsung Tab2), some devices do not report location updates for intervals of variable length (2 min up to 1 hour). (Curiously, this "blackout" period often happens around 15:00-19:00 GMT+2). Also, this tends to happen with just a subset of devices, suggesting a hardware problem.</p> <p>Another possibility is that my processLocation method, called inside LocationListener.onLocationChanged takes too long and gets stuck (?). (Of course this doesn't explain why the problem is specific to a subset of devices for a certain period of time.)</p> <p>This is a reproduction of that code:</p> <pre><code>mLocationListener = new LocationListener() { public void onLocationChanged(Location location) { if (location.getProvider().equals("gps") &amp;&amp; location.getAccuracy() &lt; accuracyThresh) { processLocation(location, time); } else { discardLocation(location, time); } } public void onProviderDisabled(String provider) { } public void onProviderEnabled(String provider) { } }; </code></pre> <p>The problem appears to fix itself after a blackout period.</p> <p>This may be relevant (<a href="https://stackoverflow.com/questions/15087738/what-causes-erratic-gps-estimates-during-certain-time-intervals">What causes erratic GPS estimates during certain time intervals?</a>) although here there is nothing systematic about the time when this issues appeared.</p> <p>As in that case, I am having difficulties to determine if this is caused by a bug in my code.</p> <p>I wonder if someone has had a similar experience or could point me in the right direction. Any suggestions for debugging? Many thanks in advance!</p>
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    1. COall the devices are in the same place? or can you see a pattern between the location of the devices that do not report properly?
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      1. USDiogo Bento
    2. COYes, all the devices are in the same city but there isn't a geographic pattern behind these "blackout" periods.
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