Establishment of the SIM Time Scale

The SIM time and frequency metrology working group has developed a comparison network for the Americas, with the goals of improving metrology in the SIM region and to allow as many countries as possible to participate in the network. As of May 2008, ten National Metrology Institutes (NMIs) were participating, and six additional NMIs are expected to join the network by the end of 2009. This paper describes how measurements from the SIM network will be used to generate a time scale named SIM-time to be used as the time reference for the SIM region