The A3 single frequency survey system performs high accuracy static and kinematic data collection for the land surveyor
With the develop of computer information technology and related technology. Based on GNSS reference net and data center. FOIF CORS with its high precision positioning service and other related integrated service, becomes the continuously operating satellite positioning integrated system
Equipped with industry standard GNSS engine (Trimble, Novatel, Javad...), supports improved performance on the high precision position jobs and related infrastructure constructions. At beginning, CORS definated as permanent satellite reference station. But now, it is not only a reference station, but also a system integrated by many reference station.