Ambiguity estimation of GNSS signals for three or more carriers
First Claim
1. A method of processing a set of GNSS signal data derived from signals having at least three carriers, comprising:
- a. Applying to the set of GNSS signal data a geometry filter using a geometry carrier-phase combination to obtain an array of ambiguity estimates for the geometry carrier-phase combination and associated statistical information;
b. Applying to the set of GNSS signal data a bank of ionosphere filters using a geometry-free ionosphere carrier-phase combination to obtain an array of ambiguity estimates for the ionosphere carrier-phase combination and associated statistical information;
c. Applying to the set of GNSS signal data at least one bank of Quintessence filters using a geometry-free and ionosphere-free carrier-phase combination to obtain an array of ambiguity estimates for the geometry-free and ionosphere-free carrier-phase combination and associated statistical information;
d. Applying to the set of GNSS signal data at least one code filter using a plurality of geometry-free code-carrier combinations to obtain an array of ambiguity estimates for the code-carrier combinations and associated statistical information; and
e. Combining the arrays of a., b., c. and d. to obtain a combined array of ambiguity estimates for all carrier phase observations and associated statistical information.
1 Assignment
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Accused Products
Abstract
Methods and apparatus are provided for factorized processing of a set of GNSS signal data derived from signals having at least three carriers. A geometry filter is applied to the set of GNSS signal data using a geometry carrier-phase combination to obtain an array of ambiguity estimates for the geometry carrier-phase combination and associated statistical information. A bank of ionosphere filters is applied to the set of GNSS signal data using a geometry-free ionosphere carrier-phase combination to obtain an array of ambiguity estimates for the ionosphere carrier-phase combination and associated statistical information. At least one bank of Quintessence filters is applied to the set of GNSS signal data using a geometry-free and ionosphere-free carrier-phase combination to obtain an array of ambiguity estimates for the geometry-free and ionosphere-free carrier-phase combination and associated statistical information. At least one code filter is applied to the set of GNSS signal data using a plurality of geometry-free and ionosphere-free code-carrier combinations to obtain an array of ambiguity estimates for the code-carrier combinations and associated statistical information. The resulting arrays are combined to obtain a combined array of ambiguity estimates for all carrier phase observations and associated statistical information.
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Citations
49 Claims
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1. A method of processing a set of GNSS signal data derived from signals having at least three carriers, comprising:
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a. Applying to the set of GNSS signal data a geometry filter using a geometry carrier-phase combination to obtain an array of ambiguity estimates for the geometry carrier-phase combination and associated statistical information; b. Applying to the set of GNSS signal data a bank of ionosphere filters using a geometry-free ionosphere carrier-phase combination to obtain an array of ambiguity estimates for the ionosphere carrier-phase combination and associated statistical information; c. Applying to the set of GNSS signal data at least one bank of Quintessence filters using a geometry-free and ionosphere-free carrier-phase combination to obtain an array of ambiguity estimates for the geometry-free and ionosphere-free carrier-phase combination and associated statistical information; d. Applying to the set of GNSS signal data at least one code filter using a plurality of geometry-free code-carrier combinations to obtain an array of ambiguity estimates for the code-carrier combinations and associated statistical information; and e. Combining the arrays of a., b., c. and d. to obtain a combined array of ambiguity estimates for all carrier phase observations and associated statistical information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Apparatus for processing a set of GNSS signal data derived from signals having at least three carriers, comprising:
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a. A geometry filter using a geometry carrier-phase combination to obtain from the set of GNSS signal data an array of ambiguity estimates for the geometry carrier-phase combination and associated statistical information; b. A bank of ionosphere filters using a geometry-free ionosphere carrier-phase combination to obtain from the set of GNSS signal data an array of ambiguity estimates for the ionosphere carrier-phase combination and associated statistical information; c. At least one bank of Quintessence filters using a geometry-free and ionosphere-free carrier-phase combination to obtain from the set of GNSS signal data an array of ambiguity estimates for the geometry-free and ionosphere-free carrier-phase combination and associated statistical information; d. At least one code filter using a plurality of geometry-free code-carrier combinations to obtain from the set of GNSS data an array of ambiguity estimates for the code-carrier combinations and associated statistical information; and e. A combiner to produce from the arrays obtained by the filters of a., b., c. and d. a combined array of ambiguity estimates for all carrier phase observations and associated statistical information. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification