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#Rockn aims to atomic clocks portable portable
Portable atomic clocks Typically, optical atomic clocks are large cumbersome machines, but DARPA's ROCKn program aims to make them smaller and lighter so they can be fitted into military vehicles, and even satellites. Optical atomic clocks are so accurate, in fact, that they wouldn't have lost a second over the universe's entire existence of more than 13 billion years.
The most accurate type of atomic clock is the optical atomic clock, which replaces the microwaves with a beam of light, boosting the accuracy by a factor of 100. The technology uses a beam of microwaves to measure the frequency of atoms as they change energy state. See Also Atomic clocks could provide a solution by allowing field units to tell the time with ultra-precise accuracy, without the need to connect to GPS. To this end, the modern military is heavily reliant on GPS, but the technology isn't always available and it can even be jammed by adversaries. Even an error of a billionth of a second could cause a missile to miss its target. In military operations, nanosecond-level accuracy is required for military craft to fire weapons at high speed and at extreme ranges. DARPA announced the ROCkN program which aims to build a super-accurate optical atomic clock compact enough to fit inside a military aircraft.
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