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> Additionally it cannot provide coverage over oceanic areas. It's really hard to jam oceanic areas though, you need a vessel capable of sustaining human life
by mschuster91 1mo ago
> Additionally it cannot provide coverage over oceanic areas.
It's really hard to jam oceanic areas though, you need a vessel capable of sustaining human life autonomously at least for days plus dealing with the high seas.
Buoys could theoretically be used for that purpose, yes, but good luck getting them stationary enough. Maybe some of the secret services could pull off such a trick but at least no ordinary civilian.
- _moof 1mo ago> sustaining human life Not really. Drone ships are very much a thing these days.
- vanviegen 1mo agoHow can a drone ship hold its designated position while it's blocking gps?
- Intermernet 1mo agoAstral navigation is probably accurate enough
- K0balt 1mo agoDead reckoning with a minute or two to get a gps fix with the jammer off once a day.
- Peanuts99 1mo agoWhat's to stop someone spoofing a GPS signal during that fix?
- K0balt 1mo agoNothing, and if it were subtle enough it could be effective at making it drift around. Lots of ways to get a rough fix though, and you don’t need very good absolute accuracy offshore, using a compass and log to DR your way around. Even better if you have a wind vane and anemometer. The majority of your drift will be wind driven.
- tisizi 1mo agoShouldn't it be possible for you to reconstruct the original GPS signal if you can control the jamming pattern?
- aeonik 1mo agoEh, 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.
- AdamN 1mo agoaccelerometers can do that job. Also it can stop the jamming every once in a while to check.
- ludston 1mo agoProbably just turn off the jammer for 2 seconds
- waste_monk 1mo agoAnchor? ;)
- egberts1 1mo agoElectro-mechanical gyroscope
- K0balt 1mo agoBy stopping jamming for a few seconds every few hours , and navigating using dead reckoning in between? With just a compass, a log, and a watch I can sail for days and end up within two kilometers of my destination.
- dotancohen 1mo agoINS
- gwbas1c 1mo agoA camera that looks at the stars / sun and a very accurate clock... Or one of the many methods described in TFA.
- jandrese 1mo agoBeyond what everyone else has said it could also have sonar and keep track of its position relative to the local ocean floor like an optical mouse.