Thread: Detect/sniff GPS signals
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hsmade is offline hsmade
2011-08-24 , 14:38
Posts: 48 | Thanked: 26 times | Joined on Feb 2010 @ UT@NL
#9
Originally Posted by smegheadz View Post
After dealing with an issue in work this thought struck me. First i'll explain the issue i had first.

We had a GPS tracking system attached to the inside of a steel container, the Antennae was on the inside also. The GPS system was functional but we found that our hardware that was inside the container kept having problems and after replacing everything we disconnected the GPS system and we stopped having faults with our hardware. We had the company who managed the GPS systems investigate and it turns out the Antennae was causing problems with the electronics on our hardware.
What probably happened here is that the oscillator that is used to downmix the received GPS signal was causing interference with the other electronics. Which is kinda weird though, that must have been some very badly shielded electronics (either the GPS receiver or the other board).

It would be possible to 'detect' such an oscillator from close distance, but it's a static signal.. there's no data in there. It's not possible with the N900 though.. mostly because you don't have direct access to the receiver through software as it's on the other side of the phone hardware from software point of view.
 

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