4 ms·
Looks like what's happening is they've found a way to use BSEs [1] to measure small variations in the earth's gravity caused by undersea terrain, probably so th
by andromeduck 3y ago
Looks like what's happening is they've found a way to use BSEs [1] to measure small variations in the earth's gravity caused by undersea terrain, probably so that they can then use existing satelite measured data [2], to recover absolute position via Terrain Contour Matching [3] like a gulf war tomahawk missle.
Edit: Seems like there's another company that's doing the same thing [4] with BSEs [5].
[1] https://physics.stackexchange.com/questions/570707/why-is-rubidium-87-used-for-bose-einstein-condensates https://physics.stackexchange.com/questions/570707/why-is-ru...
[2] https://en.wikipedia.org/wiki/TERCOM https://en.wikipedia.org/wiki/TERCOM
[3] https://earthobservatory.nasa.gov/images/87189/seafloor-features-are-revealed-by-the-gravity-field https://earthobservatory.nasa.gov/images/87189/seafloor-feat...
[4] https://www.youtube.com/watch?v=9ZiUfw6ftq4 https://www.youtube.com/watch?v=9ZiUfw6ftq4
[5] https://www.youtube.com/watch?v=X7Y7MikUS4M https://www.youtube.com/watch?v=X7Y7MikUS4M
- layer8 3y agoWhat does BSE stand for? Your link doesn’t mention it.
- andromeduck 3y agoAhh brain fart, supposed to be BECs https://www.livescience.com/54667-bose-einstein-condensate.html https://www.livescience.com/54667-bose-einstein-condensate.h...
- aaron695 3y ago> measure small variations in the earth's gravity This would be incorrect. It is just a very accurate, unproven in the field, accelerometer. https://www.youtube.com/watch?v=XwKKOPd-5cU https://www.youtube.com/watch?v=XwKKOPd-5cU - "Royal Navy's experimental ship carries out first trial of quantum navigation system" "The quantum accelerometer uses ultracold atoms to make highly accurate measurements. When cooled to extremely low temperatures the atoms start to display their ‘quantum’ nature, resulting in wave-like properties. As the atoms move through the sensor, an ‘optical ruler’ is formed by using a series of laser pulses. This allows the acceleration of the atoms to be precisely measured."
- Out_of_Characte 3y agoAcceleration would include changes in gravity.
- mertd 3y agoNaive question: don't need a precise initial location to tell subsequent locations using an accelerometer? This doesn't fully obviate GPS then?