VERIPOS Apex² service is a global, high accuracy GNSS 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.
Apex² uses PPP which is an absolute positioning technique that corrects or models all GNSS error sources such as satellite orbit, satellite clock, troposphere and ionosphere. It is an extension of the VERIPOS Apex 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 Apex² service are generated using the VERIPOS orbit and clock determination system (OCDS) which uses data from the VERIPOS reference station network with multiple and redundant OCDS systems running in dedicated VERIPOS Network Control Centres in Aberdeen and Singapore. The single set of 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 Apex² service operates independently from the VERIPOS Ultra service which uses the JPL reference station network and JPL orbit and clock corrections. 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.