The jamming equipment could be the size of a briefcase; the received signal is below the noise floor.
Or it could be one satellite already in the air beaming to a specific area. Or a constellation of satellites already in the air who handoff coverage of a specific area. Or a hack of an existing satellite constellation command and control channel to reprogram the transmitters to cover up GPS L band.
The jamming equipment could be the size of a briefcase; the received signal is below the noise floor.
Or it could be one satellite already in the air beaming to a specific area. Or a constellation of satellites already in the air who handoff coverage of a specific area. Or a hack of an existing satellite constellation command and control channel to reprogram the transmitters to cover up GPS L band.
You are not jamming GPS with a briefcase.
I’m familiar with radio systems. You could absolutely put a 1 kW L-band jammer in a briefcase, with an effective radius of probably a couple of miles.