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> Its not like ICBM's need ultra precise positioning. By the time nukes start falling ... its already all over. I'm pretty sure that due to the nature of an IC
by Zancarius 13y ago
> Its not like ICBM's need ultra precise positioning. By the time nukes start falling ... its already all over.
I'm pretty sure that due to the nature of an ICBM's flight path, they can't use GPS. AFAIK, they all use extremely precise inertial navigation systems.
- frenchman_in_ny 13y agoNot the flight path per se, but altitude over 60,000 feet and/or speed over 1,000kts are limiting factors for GPS. [0] That said, there are certain GPS devices that can bypass the limits. [1] [0] http://en.wikipedia.org/wiki/CoCom http://en.wikipedia.org/wiki/CoCom [1] http://www.wired.com/wiredscience/2013/09/bypassin-us-gps-limits-for-active-guided-rockets/ http://www.wired.com/wiredscience/2013/09/bypassin-us-gps-li...
- andrewaylett 13y agoI'm fairly sure that's an 'and', not an 'or', per your reference [0].
- Zancarius 13y agoI should clarify that by "flight path" I meant trajectory, e.g. altitude. Which is still curiously its flight path to the target.
- toomuchtodo 13y agoOptical tracking system to triangulate star positions, i.e. star trackers. http://www.fas.org/nuke/intro/missile/icbm.htm http://www.fas.org/nuke/intro/missile/icbm.htm https://www.opci.com/ocns.htm https://www.opci.com/ocns.htm
- deleted 13y ago[deleted]
- Zancarius 13y agoNear as I can tell, only Chinese missiles currently use star tracking devices [1]. US and Russian ICBMs use inertial guidance. [1] http://en.wikipedia.org/wiki/DF-31 http://en.wikipedia.org/wiki/DF-31