[Geee]

Starlink uses beamforming with directional antenna arrays, so it should be rather difficult to jam compared to omnidirectional antennas. It's basically a dish pointed at the satellite, so the jammer should be in between to work.

Antenna arrays aren't perfect so it still picks up some energy omnidirectionally, but it should be possible to shield it with some metal plates in a way that only sky is visible.

https://en.wikipedia.org/wiki/Phased_array

[overfeed]

> basically a dish pointed at the satellite, so the jammer should be in between to work.

Which isn't hard to do if you have the budget of a government. Directional antennae, GPS and a helicopter/Cessna flying patterns over a metro. Beams from the terminal are constantly scanning the sky chasing the constellations.

A higher hit rate option would be a fleet of low altitude drones taking high-res pictures of the ground, and running a fine-tuned classifier to identify Starlink Dishies which require a clear line of sight to the sky.

People who think Starlink is unblockable, or somehow anonymous IRL are unimaginative. Iran is well-versed enough with electronic warfare that it tricked a RQ-170 Sentinel land on it's territory - how hardened are Starlink terminals against responding to a spoofed signal and exposing their locations?

[ece]

Doesn't Starlink use some sort wideband signal which is hard to jam? Combined with some sort of frequency hopping and a moving constellation should mean blocking a user or satellite signal should be pretty hard, like many times the cost of building and servicing a user terminal for use against protesters.

[overfeed]

> Doesn't Starlink use some sort wideband signal which is hard to jam?

It probably is hard to jam, but you don't need to jam it if you can pinpoint terminal locations and send in on-the-ground enforcers to confiscate the equipment and make arrests. TV detector vans were introduced in 1952[1], the principles for finding sources of RF emissions isn't cutting edge technology.

1. https://en.wikipedia.org/wiki/TV_detector_van

[panick21_]

You realize Iran is pretty big with lots of people and Iran can't run around with detector van across all those regions and people. Specially when they potentially lose control over certain areas. And those vans can be disabled pretty easily as well, specially in a proto-war zone.

That said, this would only be true if there were enough people with terminals.

[ece]

TV emissions don't use beam forming. This is all a cat and mouse game, but Starlink being a distributed system should mean it is harder to completely block use of.

[overfeed]

See my other comment upthread on how beamforming doesn't make terminals/emissions invisible, just harder to acquire, but well within reach of a determined adversary. Newer Starlink terminals have a 1.5° beam, and older ones are 3.4° wide . At 10,000 feet altitude, the tighter beam is 245 feet across. Starlink satellite orbits are public and predictable, and Iran has drones to spare.

This is just 1 passive RF-based approach, and there are others (e.g. drone-mounted FLIR surveys done at 3 am)

[ece]

Like I said, this is a cat and mouse game, if you had terminals to spare or even just fake battery operated transmitting antennas, you could waste a lot of drone time. There are also masking techniques and it's not like the drones can't be tracked or misguided. It would take orders of magnitude more effort to stop Starlink than to keep using it minimally. Iran is a big country, it just depends on how determined and prepared the protestors are to evade censorship. Which by itself is hopefully just a start to other actions.

[scottyah]

My starlink works fine under a ceramic tinted window that blocks 95% of UV and visible light, so you'd need a pretty fancy SAR camera for your fleet of drones.

[touisteur]

I think, to beamform in the right direction you have to be able to locate yourself precisely, have an up-to-date almanach of the satellites, and a precise enough datation source. Jamming GNSS is a source of problems for 2 of those issues.

Also, the antennas on starlink dishes are still pretty small, likely to pick up some hard-to-remove sidelobes and the tech to cancel them properly might be export-controlled. You still need to be within electromagnetic visibility to jam them, though.

[Geee]

Yes, afaik the source of issues is GPS jamming.

To add to my point, with multiple antennas it's also possible to spatially separate signals. Not sure if Starlink is doing that, but I think it should be possible to escape GPS jammers by using two antennas with some distance between them. Two antennas can pick up the direction of the signals and with some math they can be separated, at least in theory.