Chip-scale atomic clock

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Early Chip Scale Atomic Clocks from NIST (upper right: prototype) and Symmetricom (lower left: first autonomous Chip Scale Atomic Clock).

The Chip-Scale Atomic Clock (CSAC) is a United States Army program to manufacture a microchip-sized prototype atomic clock, in order to provide location and battlespace situational awareness for dismounted soldiers even without a global positioning system capability.[1]