Sectors

Selex Galileo

PHM (Passive Hydrogen Maser) is an atomic clock with outstanding stability for averaging times from 1 to 100,000 seconds, to be used in precise positioning, time keeping and other on-board space applications. 

Maser is designed to perform in a space environment for more than 12 years. The most stable spaceborne atomic clock ever developed for an operational programme, it will be installed on all the satellites of the Galileo Constellation.