Processing of radionavigation signals using a wide-lane combination

摘要

A method for processing radionavigation signals coming from satellites that broadcast the radionavigation signals on at least two distinct frequencies, comprises
receiving the signals for each satellite,realizing, for each satellite, non-differentiated measurements of code and phase (10),determining the widelane ambiguities in a coherent manner on the group of satellites (12, 13, 14) by using the widelane biases associated with the satellites, received from a reference system, andglobal positioning of the receiver with the help of measurements of code and phase and the coherent widelane ambiguities (16, 18).;The global positioning comprises, for each satellite, the determination (16) of a pseudo distance by means of an ionosphere-free combination of the measurements of code and of the difference of the phase measurements, compensated for the widelane ambiguity, this ionosphere-free combination being optimized in terms of noise. The pseudo distance is determined by receiving the satellite clock values associated with the ionosphere-free combination from the reference system.

主权项

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.