A key component of the Veripos Standard service is the reference stations which are the source of the GNSS measurement data. Each reference station is equipped with a dual frequency (L1/L2) GPS receiver. Raw data from each Veripos Standard reference station is sent to the Veripos Network Control Centre (NCC) where it is processed to derive L1 pseudorange corrections for each satellite in view at the reference station.
All reference stations are sited in secure, climate controlled environments and have fully redundant hardware and communications links plus backup power to ensure continuous operation of the station and continuity of the Standard service to the user. Stations are located in a manner that ensures maximum coverage and redundancy throughout all key areas of offshore activity.
Reference Station Coordination
Essential to the operation of a global network of reference stations is the requirement for a geodetic reference frame that will provide seamless positioning to a high level of accuracy and repeatability on a global scale.
In order to meet this criterion and ensure a consistent global accuracy for its positioning services, the geodetic reference frame adopted by Veripos is the International Terrestrial Reference Frame (ITRF) 2000.
All Veripos reference stations are coordinated using logged dual frequency GPS data and precise orbit information in order to derive ITRF2000 coordinates using the GIPSY-OASIS II processing software package. The accuracy of the Veripos reference station coordinates are typically at the cm level.
