GEOPOSITIONING METHOD USING ASSISTANCE DATA
First Claim
1. A method for determining assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, the method comprising:
- recording, by the at least one signal receiver of the reference network, as radio-navigation signals any first radio-navigation signal and second radio-navigation signal broadcasted by each radio-navigational satellite;
deriving, by the at least one signal receiver, code and phase measurements from the said radio-navigation signals recorded, the phase measurements having ambiguities, each of which is an a priori unknown integer number of cycles;
resolving, by the at least one signal receiver, the ambiguities in the phase measurements on the first frequency in a same manner for all the satellites and reference receivers of the reference network to produce a resolution;
deducing, by the at least one signal receiver, a set of iono-free transmitter phase clock values arising from the resolution and a set of iono-free receiver phase clock values arising from the resolution;
calculating, by the at least one signal receiver, for each satellite-reference receiver pair, a carrier code shift combination value from the code and phase measurements for each respective satellite on the first frequency;
calculating, by the at least one signal receiver, a plurality of measurement residues based on the carrier code shift combination value, modelled a geometric contribution, a contribution of the iono-free receiver phase clock value, an iono-free transmitter phase clock value, and a contribution of the carrier code shift combination value;
separating, by the at least one signal receiver, in a same manner for all the satellites and receivers of the reference network, each of measurement residues into a transmitter part and a receiver part, andsmoothing, by the at least one signal receiver, the transmitter parts of the plurality of measurement residues.
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Accused Products
Abstract
A method for determining assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, is provided.
6 Citations
20 Claims
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1. A method for determining assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, the method comprising:
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recording, by the at least one signal receiver of the reference network, as radio-navigation signals any first radio-navigation signal and second radio-navigation signal broadcasted by each radio-navigational satellite; deriving, by the at least one signal receiver, code and phase measurements from the said radio-navigation signals recorded, the phase measurements having ambiguities, each of which is an a priori unknown integer number of cycles; resolving, by the at least one signal receiver, the ambiguities in the phase measurements on the first frequency in a same manner for all the satellites and reference receivers of the reference network to produce a resolution; deducing, by the at least one signal receiver, a set of iono-free transmitter phase clock values arising from the resolution and a set of iono-free receiver phase clock values arising from the resolution; calculating, by the at least one signal receiver, for each satellite-reference receiver pair, a carrier code shift combination value from the code and phase measurements for each respective satellite on the first frequency; calculating, by the at least one signal receiver, a plurality of measurement residues based on the carrier code shift combination value, modelled a geometric contribution, a contribution of the iono-free receiver phase clock value, an iono-free transmitter phase clock value, and a contribution of the carrier code shift combination value; separating, by the at least one signal receiver, in a same manner for all the satellites and receivers of the reference network, each of measurement residues into a transmitter part and a receiver part, and smoothing, by the at least one signal receiver, the transmitter parts of the plurality of measurement residues. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer program product comprising a non-transitory computer readable medium storing computer program code for determining assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, the computer program code being executable by a processor of at least one signal receiver of the reference network to cause the processor to perform:
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recording as radio-navigation signals any first radio-navigation signal and second radio-navigation signal broadcasted by each radio-navigational satellite; deriving code and phase measurements from the said radio-navigation signals recorded, the phase measurements having ambiguities, each of which is an a priori unknown integer number of cycles; resolving the ambiguities in the phase measurements on the first frequency in a same manner for all the satellites and reference receivers of the reference network to produce a resolution; deducing a set of iono-free transmitter phase clock values arising from the resolution and a set of iono-free receiver phase clock values arising from the resolution; calculating for each satellite-reference receiver pair, a carrier code shift combination value from the code and phase measurements for each respective satellite on the first frequency; calculating plurality of measurement residues based on the carrier code shift combination value, a modelled geometric contribution, a contribution of the iono-free receiver phase clock value, an iono-free transmitter phase clock value, and a contribution of the carrier code shift combination value; separating in a same manner for all the satellites and receivers of the reference network, each of measurement residues into a transmitter part and a receiver part, and smoothing the transmitter part of the plurality of measurement residues. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system comprising radio-navigational satellites and at least one signal receiver, the at least one signal receiver configured to determine assistance data to facilitate processing of radio-navigation signals from a set of radio-navigational satellites of a reference network, each radio-navigational satellite broadcasting at least a first radio-navigation signal on a first frequency and a second radio-navigation signal on a second frequency, the second frequency being distinct from the first frequency, the at least one signal receiver configured to:
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record as radio-navigation signals any first radio-navigation signal and second radio-navigation signal broadcasted by each radio-navigational satellite; derive code and phase measurements from the said radio-navigation signals recorded, the phase measurements having ambiguities, each of which is an a priori unknown integer number of cycles; resolve the ambiguities in the phase measurements on the first frequency in a same manner for all the satellites and reference receivers of the reference network to produce a resolution; deduce a set of iono-free transmitter phase clock values arising from the resolution and a set of iono-free receiver phase clock values arising from the resolution; calculate for each satellite-reference receiver pair, a carrier code shift combination value from the code and phase measurements for each respective satellite on the first frequency; calculate plurality of measurement residues based on the carrier code shift combination value, a modelled geometric contribution, a contribution of the iono-free receiver phase clock value, an iono-free transmitter phase clock value, and a contribution of the carrier code shift combination value; separate in a same manner for all the satellites and receivers of the reference network, each of measurement residues into a transmitter part and a receiver part, and smooth the transmitter part of the plurality of measurement residues. - View Dependent Claims (18, 19, 20)
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Specification