Processing of radionavigation signals using a wide-lane combination

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:

• a) receiving, for each satellite of said group, said first and second signals;
• b) 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;
• c) determining the widelane ambiguities in a coherent manner for the group of satellites by using widelane biases, received from a reference system, associated with the satellites of said group of satellites, and
• d) 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 in a coherent manner on 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 ionosphere-free combination being optimised in terms of noise, 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 reference system.

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, a second radionavigation signal on a second frequency and a third radionavigation signal on a third frequency, said first, second and third frequencies being mutually distinct, said method comprising, at a receiver:

• a) receiving, for each satellite of said group, said first, second and third signals;
• b) executing, for each satellite of said group, non-differentiated measurements of code and phase of said first, second and third received signals, said measurement of phase of the first signal, said measurement of phase of the second signal and said measurement of phase of said third signal each having an a priori unknown integer ambiguity, such that a first widelane combination of the measurements of phase of the first and second signals has an a priori unknown first widelane integer ambiguity and a second widelane combination of the measurements of phase of the first and third signals has an a priori unknown second widelane integer ambiguity;
• c) determining the first and second widelane ambiguities in a coherent manner for the group of satellites by using widelane biases, received from a reference system, associated with the satellites of said group of satellites, and
• d) fixing a position of the receiver using said measurements of code and phase of the first, second and third received signals as well as the first and second widelane ambiguities determined in a coherent manner on the group of satellites,
• said fixing the position of the receiver comprises, for each satellite of said group of satellites, determining a first pseudo distance using a first 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 first widelane ambiguity, and determining a second pseudo distance using a second ionosphere-free combination of said measurements of code and a difference of the measurements of phase of the first and third signals, compensated by the second widelane ambiguity, said first and second ionosphere-free combinations being optimised in terms of noise, said determining of the first and second pseudo distances also depending on satellite clock values associated with said first and second ionosphere-free combinations, said satellite clock values being received from a reference system.

GNSS receiver, configured to treat 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 treating comprising:

• a) receiving, for each satellite of said group, said first and second signals;
• b) 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;
• c) determining the widelane ambiguities in a coherent manner for the group of satellites by using widelane biases, received from a reference system, associated with the satellites of said group of satellites, and
• d) 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 in a coherent manner on the group of satellites,
• wherein said fixing the position of the receiver comprises, 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 ionosphere-free combination being optimised in terms of noise, 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 reference system.