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5G jamming GPS and radio altimeters

https://www.aopa.org/news-and-media/all-news/2020/may/07/protecting-gps-senators-grill-officials-on-ligado-network-plan

Just read this and wonder if anyone else has seen it and would care to comment? I have insufficient knowledge of radio to understand if there really is any possibility of these signals affecting GPS.

UK, United Kingdom

There’s not enough detail in there to know. It just says it’s L band, which is 500MHz to 1.5GHz. GPS also operates in the L band, but so do a lot of other things, including things like the amateur 23cm band (where in the USA, an amateur is free to transmit at 1500w of power, which is quite a lot).

The main issue is that if the service is harmonically related to a GPS signal (e.g. if it’s say 1/3rd or 1/2 the frequency of one of the GPS signals), and it’s strong, then the harmonics can be a problem (see issues with certain air band frequencies, their harmonics, and an aircraft’s on-board GPS).

Last Edited by alioth at 09 May 08:42
Andreas IOM

A firm called Lightsquared planned a network in the US with permission to use frequencies which conflicted with GPS. They were stopped.
So they’ve changed their name, but not the frequencies, and are trying again.

Last Edited by Maoraigh at 09 May 21:24
Maoraigh
EGPE, United Kingdom

The FCC is just a corrupt puppet for industry under this administration.

KPJC and Kent, UK

A firm called Lightsquared planned a network in the US with permission to use frequencies which conflicted with GPS. They were stopped.
So they’ve changed their name, but not the frequencies, and are trying again.

And the same thing comes around

Administrator
Shoreham EGKA, United Kingdom
Administrator
Shoreham EGKA, United Kingdom

Radio altimeter jamming

It’s going to be good money for somebody to rip out all that expensive kit and replace it with even more expensive immune kit

Administrator
Shoreham EGKA, United Kingdom

Are there really radio altimeters out there with such a poor RF front end they’ll get de-sensed by signals that are (a) not harmonically related (b) over 200MHz away? (I guess some ancient kit might be)

Andreas IOM
8 Posts
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