Nomad e.g. land vehicle, position locating method for GPS, involves applying ionospheric corrections, during resolution of frequency ambiguity, based on ionospheric model calculated by fixed terrestrial reference station

摘要

Phase difference ambiguity is first determined between third and second extra-long path carriers. Phase difference ambiguity is then estimated between third and second long path carriers from ambiguity for extra-long path determined in first step. Next step involves resolving ambiguity of one frequency from long path ambiguity estimated in second step. Additional step involves applying real-time ionospheric corrections during third step. Corrections are based on permanently updated ionospheric model of ionospheric layer calculated by a fixed terrestrial reference station linked with geodesic data calculated by a master fixed terrestrial reference station (REFM-REFME). An Independent claim is also included for a navigation system for locating position of a nomad e.g. land vehicle.