A Resilient Secondary Realization of UTC(PTB) Using a Passive Hydrogen Maser

SummaryThis paper describes the design and operation of an additional, autonomous implementation of UTC(PTB). The realization of this time scale is set-up geographically separated from the primary UTC(PTB) realization. It is based on a passive hydrogen maser, steered via a custom algorithm by either the PTB’s caesium fountains or the BIPM product UTCr. Using a multi-site approach increases the resilience of UTC(PTB) in case of a major accident and allows for additional testing possibilities.