time and frequency standard

time and frequency standard

A reference value of time and time interval. Standards of time and frequency are determined by astronomical observations and by the operation of atomic clocks and other advanced timekeeping instruments. They are disseminated by transport of clocks, radio transmissions, satellite relay, and other means.
References in periodicals archive ?
In addition, a Global Positioning System (GPS) synchronizing input enables a cesium beam performance upgrade using a GPS time and frequency standard.