This paper describes a low-cost time transfer receiver that allows timing laboratories, including national metrology institutes and other
designated institutions, to contribute data to the computation of Coordinated Universal Time (UTC). The time transfer receiver
compares a laboratory’s local realization of UTC, to signals broadcast by Global Positioning System (GPS) satellites. It stores the
measurement results in a format compatible with international standards, and sends data via the Internet to the Bureau International
des Poids et Mesures (BIPM) for inclusion in the UTC computation. In addition to being inexpensive, the receiver was designed to be
easy to use, allowing recently established timing laboratories to begin contributing to UTC with a minimal investment in training.
Key words: Coordinated Universal Time (UTC); Global Positioning System (GPS); International Atomic Time (TAI); time transfer
