GPS activities at the National Measurement Institute, Australia

The National Measurement Institute, Australia, (NMIA) is continuing the development of reliable, high-integrity and remotely-operable GPS-based systems for precise time and frequency transfer. These systems combine an OEM receiver with a PC and support a variety of applications, of which we describe three: the intercomparison of receiver internal delays among laboratories in the Asia-Pacific, using a portable time-transfer system; a geodetic monitoring station, contributing data to Australian and international geodetic reference networks; and delivery of traceable time and frequency to a distant location, or equivalently continuous remote calibration of a frequency standard at a client's premises