Earlier quoted context omitted.
How can a drone ship hold its designated position while it's blocking gps?
Astral navigation is probably accurate enough
Dead reckoning with a minute or two to get a gps fix with the jammer off once a day.
Cheap GPS jammers are filling the world with navigation dead zones
151–160 of 243 posts
Re: Cheap GPS jammers are filling the world with navigation dead zones
#152Whats really sad for aviation is there was already an extensive network of ground based navaids. As GPS has proliferated, they've slowly been decommissioned as they age out to save on cost. I'm specifically referring to VORs which provide azimuth and range to station. GPS is fantastic and as a primary source everyone loves the benefits it brings. However, in a century of aviation, everyone has kinda sorted out that y…
A bunch of us old salty sailing nerds were actually discussing Decca Navigator System¹ the other day that was still very present in the 90s on the ships we were sailing. Now all replaced and removed.
Re: Cheap GPS jammers are filling the world with navigation dead zones
#153Earlier quoted context omitted.
How can a drone ship hold its designated position while it's blocking gps?
Shouldn't it be possible for you to reconstruct the original GPS signal if you can control the jamming pattern?
Eh, I doubt it, GPS signal is so weak, once the EM field in the air has so much power, I think the literal hardware ADC of any receiver would be overwhelmed/clipped with a high power jammer nearby. I mean it's possible that the front end will be literally fried, not just clipping the analog front end. GPS is usually -130dBM, it's absurdly weak.
But in theory you're not wrong.
Re: Cheap GPS jammers are filling the world with navigation dead zones
#154I wish there were cheap Bluetooth jammers to prevent speakers from playing when hiking
Where do you hike where it’s a problem? I mean if I meet perhaps 10 people max over 2 hours. If all of them were blasting music it still wouldn’t worry me at all.
Many (surprisingly more reachable ones) parts of European Alps. But very few actually do that, I think they would experience a lot of aggression from others (certainly from me)
Re: Cheap GPS jammers are filling the world with navigation dead zones
#155Whats really sad for aviation is there was already an extensive network of ground based navaids. As GPS has proliferated, they've slowly been decommissioned as they age out to save on cost. I'm specifically referring to VORs which provide azimuth and range to station. GPS is fantastic and as a primary source everyone loves the benefits it brings. However, in a century of aviation, everyone has kinda sorted out that y…
A bunch of us old salty sailing nerds were actually discussing Decca Navigator System¹ the other day that was still very present in the 90s on the ships we were sailing. Now all replaced and removed. https://en.wikipedia.org/wiki/Decca_Navigator_System
Oh, wow! That seems to fill a gap below LORAN's range, and far exceeding its accuracy. I never heard of it before!
Re: Cheap GPS jammers are filling the world with navigation dead zones
#156Earlier quoted context omitted.
I believe it’s been made public that this was a jamming test, not a spoofing test.
If you overpower a signal, is there a difference? I'm not saying you're right or wrong here. I'm just saying there's a long history of coverups in the government and military. If you can say, "oh we were only jamming" when in fact you were spoofing, well that's certainly a super easy excuse to hide behind.
>If you overpower a signal, is there a difference?
Yes, obviously. Losing signal on your GPS unit, and having your GPS unit tell you that you are in a different position than you actually are, are two very different things.
Also, since other aircraft reported GPS issues, that is evidence that would speak to jamming or spoofing. All three other aircraft reported a loss of GPS, not inaccurate GPS. Coverups are real, government conspiracies are real. But the completely evidenceless “I’m just saying…” or “isn’t it weird…” or “I’m just asking questions” is tiresome.
Re: Cheap GPS jammers are filling the world with navigation dead zones
#157I wish there were cheap Bluetooth jammers to prevent speakers from playing when hiking
I strongly suspect those would be very illegal and could result in serious side effects, such as for people who use continuous glucose monitors.
Oh wow but a GPS jammer is okay so someone could get lost and possibly killed, or even crash a plane?
Re: Cheap GPS jammers are filling the world with navigation dead zones
#158I wish there were cheap Bluetooth jammers to prevent speakers from playing when hiking
Where do you hike where it’s a problem? I mean if I meet perhaps 10 people max over 2 hours. If all of them were blasting music it still wouldn’t worry me at all.
We encountered this on the Inca trail in Peru. All it takes is one rude person.
Re: Cheap GPS jammers are filling the world with navigation dead zones
#159Earlier quoted context omitted.
I strongly suspect those would be very illegal and could result in serious side effects, such as for people who use continuous glucose monitors.
Oh wow but a GPS jammer is okay so someone could get lost and possibly killed, or even crash a plane?
i’m delighted to report that it’s actually possible for people to talk about a second, related topic in a comment section without invalidating the problems of the main post being commented on
Re: Cheap GPS jammers are filling the world with navigation dead zones
#160Earlier quoted context omitted.
https://gps.stanford.edu/research/current-and-continuing-gps... Single element antennas, adaptive antennas, beam steering antennas. Basically attempting to pull good RF while avoiding bad RF. (this has been applied in the Russo-Ukrainian war in modified Starlink equipment) GPS antenna mods make Starlink terminal immune to jammers - https://news.ycombinator.com/item?id=39616417 - March 2024 (72 comments) https://olegk…
The Russian response to directional antennas is to mount GPS jammers on satellites https://www.gpsworld.com/todd-humphreys-russian-satellites-a...
If Russia’s proof of concept moves to active use, those satellites (Kosmos 2546 and any others) will need to be removed from service with anti satellite technology (either munition or X-37B equivilent). Clearly Russia is attempting to shield an overt military capability behind the satellite’s early warning launch detection primary mission to dissuade attempts to disable it. Remove the orbital capability, deny them access to replace it.
Ongoing Ukrainian strikes against Rassvet satellite production and launch sites contribute to further impairment of Russia's ability to get any new or replacement satellites to orbit.
https://ua.news/en/war-vs-rf/video-ukrayina-atakuvala-golovn...
https://en.wikipedia.org/wiki/Kosmos_2446