On 08/06/2012 01:15 AM, Chris Albertson wrote:
The main way you can expect to loose GPS signal by intent is by jamming.
If you jam GPS, you better jam GLONASS at the same time.
Most jamming in unintentional. For example a TV news station sets up a
remote truck and aims the truck's microwave antenna right at your GPS
antenna. Your GPS would be down but only for hours or a day or so. Or
in some other case a transmitter on the same tower as your GPS fails in a
way that causes it jam everything nearby. THese things happen.
There are about a quarter million cell towers in the US alone so these one
in a million events do happen frequenty. But if you only own one GPS
receiver the changes of it happening even once is remote.
Frankly, the main reason to loose GPS signal is not by jamming at all,
and if it is being jammed, then most of the times it was unintentional,
and if it was intentional you where probably not the main target anyway.
The argument that GPS can be turned of by the US government is true, but
very unlikely. Their approach has to be much more selective than denying
large parts of the globe the signal. Their approach is to jam the signal
hard, and make sure their own troups have signal despite the jamming.
Cheers,
Magnus
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