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Fascinating article. About this: > Before GPS, navigation systems used a technique called ‘dead reckoning‘. Dead reckoning relied on sensors to determine dist
by bambax 3y ago
Fascinating article.
About this:
> Before GPS, navigation systems used a technique called ‘dead reckoning‘. Dead reckoning relied on sensors to determine distance traveled and direction of travel. However, no sensor is perfect. As a result the further you travel the greater the errors build. Pretty quickly you have no idea where you are.
> To solve this problem Etak invented ‘augmented dead reckoning’. This used a process to match the position given by the navigation sensors to a topologically correct electronic map. Whenever the vehicle turned you made the assumption that you’re driving on a road. At that point the location could be ‘snapped’ back to the road and the error from the sensors could be reset. This technique was later adopted by all navigation apps and is still in use today.
Authorities usually intercept unwanted (consumer) drones by blocking the signal between the pilot and the drone; and it's also possible to jam GPS signal.
But a drone that would use some version of "augmented dead reckoning" with a (relatively basic) analysis of features on the ground (roads, rivers, train tracks) would be able to guide itself without external input and would be virtually unstoppable (short of destruction).
Yet they don't seem to exist yet? Is this harder to do than it sounds?
- jelkand 3y agoThat sounds like inertial navigation with nav fixes, which predates GPS. It certainly does exist.
- brk 3y ago>Authorities usually intercept unwanted (consumer) drones by blocking the signal >between the pilot and the drone; Curious which country you are in where you see this occurring.
- defrost 3y agoSingapore, Germany, the UK, USA, Australia, .. countries with airports that want domestic security, etc. https://www.trd.sg/ https://www.trd.sg/ https://hp-jammer.de/en/drohnenabwehr/ https://hp-jammer.de/en/drohnenabwehr/ etc. Once you start looking at GPS spoofing, etc. it gets quasi-military, non-commercial, requires credentiuals | LEO contacts, ways to work around checks and balances: https://www.regulus.com/ https://www.regulus.com/ is Israeli miltech, other companies in other countries are similar.
- brk 3y agoIt's definitely not happening in the US. I've heard of it a bit in UAE, but not much elsewhere, so I was curious where the OP was observing this.
- defrost 3y agoIt's definitely happening in the USofA with federal authorities acting on behalf of the FAA wrt airport security ... Sure, that's not commercial .. but it's a Federal LEO with a tan shirt and shorts and a truck with "UAS Mitigation Systems" in the back. https://www.faa.gov/airports/new_entrants/uas_detection_mitigation_response https://www.faa.gov/airports/new_entrants/uas_detection_miti... UAS mitigation or countermeasures include the capability to disrupt, disable, destroy, take control of, and/or provide alternate flight instructions to a UAS. Some UAS detection systems may have countermeasure capabilities built-in, which can be disabled, while others may offer them as an optional modular capability. FAA currently does not support the usage of C-UAS systems by any entity other than the federal departments (Defense, Homeland Security, Justice, and Energy) that have explicit statutory authority to use this technology. It's kept on the relative down low but it's a similar situation in most G20 countries; quasi federal, quasi military, hard to get hold of w/out specific clearances, mostly only usable with explicit statutory authority ... but "leaky" in the same sense as "fake" mobile cell towers and other technical LEO gear has been in the past, out there with systems to hack cars, etc. Grey market availability.
- mikaraento 3y agoGPS signal disturbancecs are surprisingly common: https://gpsjam.org/ https://gpsjam.org/
- bambax 3y agoI'm in France; here's a demo of a "drone gun" by law enforcement authorities (in French, but you can probably get the gist of it even without the dialogue): https://www.youtube.com/watch?v=AKHNVJfVIQg&t=480s https://www.youtube.com/watch?v=AKHNVJfVIQg&t=480s But I'm pretty sure this exists in most/all countries; DJI even sells equipment specially designed to listen to its own drones.
- flerchin 3y agoTomahawk missiles do this, as do many other munitions. https://en.wikipedia.org/wiki/TERCOM https://en.wikipedia.org/wiki/TERCOM
- bitcurious 3y ago> Yet they don't seem to exist yet? Is this harder to do than it sounds? It exists, but isn’t advertised much as it’s essentially a military technology. If you read about the homegrown attack drones Ukraine is building they use a variation of this tech. Various US platforms do something similar. You won’t see this in a consumer drone anytime soon, but a skilled hobbyist could rig something together.
- GuB-42 3y agoAbout all somewhat advanced military systems do some kind of "augmented dead reckoning", including what you suggest. Civilian systems are usually not designed to work in a hostile environment, not only it is costly for a situation that is unlikely to happen in normal use, but authorities usually don't like it when such technology is available to the public. As a result, it tends to be classified. They want to be keep the advantage over enemies and criminals.
- yc-kraln 3y agoWorking on this. It is harder than it sounds, but not impossible.