3 ms·
> Number is a bit high but may be counting GPS, and EU GPS satellites you would have to block. All of which transmit on the same 3-4 frequencies: * https://gs
by throw0101c 3y ago
> Number is a bit high but may be counting GPS, and EU GPS satellites you would have to block.
All of which transmit on the same 3-4 frequencies:
* https://gssc.esa.int/navipedia/index.php?title=GNSS_signal https://gssc.esa.int/navipedia/index.php?title=GNSS_signal
so you'd only have to have high-power transmitters on those and you can block things.
* https://gpsjam.org https://gpsjam.org
Do it from a plane, or drone, and directional antennas become less effective as the jamming is coming from the same direction as the real signal (the sky).
- londons_explore 3y agoPhased arrays can have a beamwidth of 1 degree... Which means the enemy has to get their jamming signal within 1 degree of the victim and the satellite. And now you need to do that 30 times when there are 30 visible satellites.
- throw0101c 3y agoA phased array can transmit to with-in a small angle, but how does that help the receiver? It is still coming from "the sky", so if you have an airborne jammer (EW fighter, drone), how will the receiver what's signal and what's noise? I am aware of the spot beam functionality, which has higher power, which could help with overcoming noise: * https://en.wikipedia.org/wiki/GPS_Block_III#Military_(M-code) https://en.wikipedia.org/wiki/GPS_Block_III#Military_(M-code... The biggest recent help against jamming was the introduction of the L2C signal on a different frequency with the Block IIR-M satellites, and then the more powerful L5 signal on Block IIF.
- londons_explore 3y agoA phased array antenna can both transmit and receive within a small beam angle.