Development and applications of a traceable time-transfer system

The National Measurement Institute, Australia (NMIA) has been developing GPS Common View (GPSCV) time-transfer systems since the late 1990's. These provide traceability to UTC(AUS) for laboratory frequency references and network time. We describe our system, including advice on the use of low-cost receivers for GPSCV, summarise our 15 years of providing services based on it and conclude with a summary of current and future developments.