The CubeSat Handling of Multisystem Precision Time Transfer (CHOMPTT) mission is a precision timing satellite equipped with atomic clocks synchronized with a ground clock via laser pulse. The 1U instrument contains a pair of chip-scale atomic clocks, picosecond event timers, and avalanche photo-detectors that will be integrated into a 3U CubeSat bus.

Clock synchronization between ground-to-space and space-to-space terminals is critical for future missions, especially outside GPS coverage. This technology could help enable constellations of nanosatellites to precisely correlate astronomical, heliophysical or Earth observations and to coordinate spacecraft to produce a distributed aperture.