4 ms·
As a former submariner who has had used clock for inertial navigation or for similar weapons systems 1/3 of a second over 100 hours is terrible.
by GCU-Empiricist 9y ago
As a former submariner who has had used clock for inertial navigation or for similar weapons systems 1/3 of a second over 100 hours is terrible.
- leggomylibro 9y agoI mean, it's not an atomic clock, but I'm comparing it to the 32.768KHz RTC crystals I use with consumer microchips. If super-precise isolated accuracy were actually important, I assume they would use a rubidium or cesium oscillator.
- grkvlt 9y ago1/3 of a second in 100 hours is basically 1ppm, or TXCO levels of accuracy, so pretty good i'd have thought, even for a submarine INS?
- cocoablazing 9y agoUSN ballistic missile submarines deploy the most accurate INS in the world (ESGN), and that system is used in conjunction with another advanced gyro.
- GCU-Empiricist 9y agoHere is a 2 RU atomic clock on ebay for context: https://www.ebay.com/itm/Antelope-Audio-Isochrone-10M-Rubidium-Atomic-Master-Clock-Rack-Unit/292465831262?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D49924%26meid%3Dd0f3bb7e07324300b3aa0f1462206b9b%26pid%3D100011%26rk%3D1%26rkt%3D3%26sd%3D183045907785%26itm%3D292465831262&_trksid=p2047675.c100011.m1850 https://www.ebay.com/itm/Antelope-Audio-Isochrone-10M-Rubidi...
- grkvlt 9y agoNot sure about that. ESGN is old technology, since submarines don't need that much accuracy. For example, space probes, ballistic missiles, smart artillery shells/rockets/missiles and so on would all appear to have multiple orders of magnitude better accuracy than submarines, in the fractional ppb ranges, rather than tens of ppm. [0][1] 0. https://www.sto.nato.int/publications/STO%20Meeting%20Proceedings/RTO-MP-SET-104/$MP-SET-104-KN2.pdf https://www.sto.nato.int/publications/STO%20Meeting%20Procee... 1. http://users.cecs.anu.edu.au/~Jonghyuk.Kim/teaching/Inertial_Where%20to%20now_DraperLab.pdf http://users.cecs.anu.edu.au/~Jonghyuk.Kim/teaching/Inertial...