Patent ID: 8760344
Filing Date: 2014-06-24
Classification: G01S

Abstract:
1. Method of treating radionavigation signals that originate from a group of satellites, in which each satellite broadcasts at least a first radionavigation signal on a first frequency and a second radionavigation signal on a second frequency that is different from the first, said method comprising, at a receiver: receiving, for each satellite of said group, said first and second signals; executing, for each satellite of said group, non-differentiated measurements of code and phase of said first and second received signals, said measurement of phase of the first signal and said measurement of phase of the second signal each having an a priori unknown integer ambiguity, such that a widelane combination of the measurements of phase of the first and second signals has an a priori unknown widelane integer ambiguity; receiving, from a reference system, a widelane bias associated with each satellite in said group of satellites; determining, for each satellite of said group of satellites, an estimated widelane ambiguity based on the corresponding non-differentiated measurements of code and phase; determining, for each satellite of said group of satellites, the respective widelane ambiguity based on the corresponding estimated widelane ambiguity and the corresponding widelane bias; and fixing a position of the receiver using said measurements of code and phase of the first and second received signals as well as the widelane ambiguities determined for the group of satellites, said fixing the position of the receiver comprising, for each satellite of said group of satellites, determining a pseudo distance using an ionosphere-free combination of said measurements of code and a difference of the measurements of phase of the first and second signals, compensated by the widelane ambiguity, said determining of the pseudo distance also depending on satellite clock values associated with said ionosphere-free combination, said satellite clock values being received from a second reference system.