3 ms·
An accelerometer and gyroscope may not make for a precise dead reckoning system, but if all you need is to get into a 1m blast radius, they might be good enough
by jarfil 8y ago
An accelerometer and gyroscope may not make for a precise dead reckoning system, but if all you need is to get into a 1m blast radius, they might be good enough. Pair that with a smartphone with face/feature detection like those used for AR, and you might be able to navigate pretty much anywhere, no need for GPS.
- web007 8y agoIIRC exactly this was the basis of removing selective availability on GPS signals for civilian use. The original GPS spec had two bands / channels / something: one that was encrypted, for military use, and a "fuzzy" version for civilians that would vary ±100 meters in accuracy. Once inertial guidance for missiles became more accurate than ±100 meters, there wasn't a point to reducing the civilian accuracy anymore, so they disabled SA in 2000 and went all-in on availability in 2007. https://www.gps.gov/systems/gps/modernization/sa/ https://www.gps.gov/systems/gps/modernization/sa/
- WalterBright 8y agoThe V2 guidance system was an integrating accelerometer and a gyroscope. They could barely hit a target the size of London. The lack of accurate guidance made it a militarily ineffective weapon.
- facing_worlds 8y agoTo be fair the V2 rockets never hit anything useful prinarily because the British had turned every german spy and were feeding them false information about the results of the attacks.
- WalterBright 8y agoThe rocket guidance system was not capable of hitting something more precise than "London", and of course the British tried to stop even that from happening.