VERIPOS Ultra² service is a global, precise positioning service using both the GPS and GLONASS constellations.
It is designed to meet all offshore positioning and navigation applications, delivering decimetre level accuracy while providing a solution that is more resilient to the problems caused by satellite masking and ionospheric scintillation.
Ultra² uses PPP which is an absolute positioning technique where all the GNSS system errors are removed or minimised by direct calculation, precise modelling or estimation. It is an extension of the VERIPOS Ultra service using both GPS and GLONASS high precision dual-frequency observations to provide accurate positioning.
The satellites from the GLONASS constellation provide additional observations. This can help maintain reliable and accurate positioning when masking of satellites occur (e.g. when working close to a platform) or when suffering from ionospheric scintillation. Another benefit from using both satellite constellations is faster convergence of the positioning solution.
Real-time corrections for the Ultra² service are provided by the JPL orbit and clock determination system (OCDS) which uses data from JPL reference stations. Redundant orbit and clock corrections are provided to the VERIPOS Network Control Centres in Aberdeen and Singapore. The orbit and clock corrections for all satellites in the GPS and GLONASS constellations are valid globally, meaning position accuracy is maintained regardless of user location.
The Ultra² service operates independently from the VERIPOS Apex² service which uses the VERIPOS reference station network and VERIPOS orbit and clock process. All services are broadcast via seven geostationary communications satellites to ensure availability and service redundancy while providing access to two independent and high accuracy positioning services.