A concept for precise Time Transfer via Viasat’s Global Xpress (GX) satellites in GEO, ultimately independent of any GNSS, has been developed and referred to as Global Xpress Time Transfer. The concept uses enhanced orbit determination data and will make use of Code Division Multiple Access (CDMA) signals in the global beam of the satellite adjacent to the global signalling channel. In the first instance, The Global Xpress Time Transfer concept is to use these signals as a mechanism for precise Time Transfer to user terminals at known locations.

As the Viasat space and ground segments are TRL9 (enhancing existing capabilities), the user terminal development is a key element of this proof-of-concept phase. In addition to identifying the methods of improving the ground segment and capacity utilisation, it will enable Viasat to characterise the changes required to launch a full commercial service. The work will also include an evaluation of customer demand and market segmentation to inform and guide the future technical, operational and commercial developments.