[ntp:questions] GPS Jammers in Use by Criminals - Warping Time for Fraud Suggested

[David Woolley]

Jason wrote:

> So, what would be a characteristic symptom or tell-tale of jamming?
> 
Simple jamming, as used to defeat vehicle tracking, would result in the 
loss of all satellites.  Sophisticated jamming, to produce a false time, 
would, for its target, produce a slow drift in the time, with no alarms, 
although the signal strength would be higher than usual.  Receivers at 
the limits of jammer range might not be able to get consistent solutions 
across different satellite combinations, so might alarm for that, and 
otherwise might behave as for a simple jammer.