[time-nuts] Coalition to Save GPS

Magnus Danielson magnus at rubidium.dyndns.org
Sun Mar 13 04:51:29 EDT 2011


On 03/13/2011 08:33 AM, bg at lysator.liu.se wrote:
>> The military is the one service that won't be affected by this
>> interference.
>> They run on a different band, and their modulation is more robust than
>> the civilian side.
>
> Could you deliberate a bit?  I suspect that military receivers use L1 C/A,
> L1 P(Y) and L2 P(Y). This is the exact same signals civilian geodetic
> receivers has been using since about the Ashtech Z12 and its z-tracking.
>
> http://www.prc68.com/I/DAGR.shtml#GPSs
>
> It seems two out of three signals used by the military is affected by
> interference close to L1 (1575MHz.)

While military receivers have better jamming resistance when tracking L1 
and L2 P(Y), this improved jamming resistance is a matter of distance. 
Get close enough and they will be blinded out too.

Cheers,
Magnus




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