[tripplyons]

Wouldn't you just be able to shield the antenna to only point up? I think that is how some aircraft stay protected from GPS jamming/spoofing, and I assume you can do something similar.

[echoangle]

The satellite still needs to be able to receive the signal from the terminal. If the Iranian Government sets up transmitters that send up Noise at the satellites, the satellite isn't going to be able to receive the low power transmissions from the terminal if the jammer is close enough to the terminal.

It depends on the Jamming power and the satellite beamforming how close you would have to be to jam it.

This is not the case for GPS because GPS is receive-only and the satellite doesn't listen for user transmissions (although you could still try to jam the control uplink to prevent synchronization which would decrease accuracy over a few days, but then you would have to be close to the GPS control stations and you'll probably get arrested soon)

[tripplyons]

I did not consider that direction of communication! Seems much easier to locate and send nonsense to satellites than to land-based terminals.

[jpmattia]

I would guess that someone is beaming a whole lot of wideband power at the satellites themselves, to overload the input receivers.

[tripplyons]

Thank you! I now realize that my analogy was misplaced due to how Starlink is bidirectional and GPS is unidirectional.