SYSTEM AND METHOD FOR APPLYING CODE CORRECTIONS FOR GNSS POSITIONING
First Claim
1. A method for approximating a position using a GNSS system having a plurality of GNSS satellites and an augmentation system, the method comprising:
- (a) obtaining an initial code pseudorange measurement and an initial carrier phase measurement from a signal transmitted by a GNSS satellite in the GNSS system;
(b) receiving at least one code correction from the augmentation system;
(c) using the at least one code correction to correct the initial code pseudorange measurement and the initial carrier phase measurement to mitigate for errors in the signal, to result in a corrected code pseudorange measurement and a corrected carrier phase measurement; and
(d) using a code dominated measurement in a filter which outputs a position and ambiguity estimate.
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Accused Products
Abstract
A method and system for approximating a position using a Global Navigational Satellite System (GNSS) having a plurality of GNSS satellites and an augmentation system, the method including the steps of obtaining an initial code pseudorange measurement and an initial carrier phase measurement from a signal transmitted by a GNSS satellite in the GNSS system, receiving a code correction from the augmentation system, using the code correction to correct the initial code pseudorange measurement and the initial carrier phase measurement to mitigate for errors in the signal, to result in a corrected code pseudorange measurement and a corrected carrier phase measurement, and using a code dominated measurement in a filter which outputs apposition and ambiguity estimate.
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Citations
19 Claims
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1. A method for approximating a position using a GNSS system having a plurality of GNSS satellites and an augmentation system, the method comprising:
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(a) obtaining an initial code pseudorange measurement and an initial carrier phase measurement from a signal transmitted by a GNSS satellite in the GNSS system; (b) receiving at least one code correction from the augmentation system; (c) using the at least one code correction to correct the initial code pseudorange measurement and the initial carrier phase measurement to mitigate for errors in the signal, to result in a corrected code pseudorange measurement and a corrected carrier phase measurement; and (d) using a code dominated measurement in a filter which outputs a position and ambiguity estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A computer readable memory having recorded thereon statements and instructions for execution by a data processing system to carry out a method as claimed above.
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18. A device for approximating a position using a GNSS system having a plurality of satellites and an augmentation system, the apparatus comprising:
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(a) at least one memory, the memory containing a set of program instructions; (b) at least one processor operatively connected to the memory, the at least one processor responsive to the program instructions to; (i) obtain an initial code pseudorange measurement and an initial carrier phase measurement from a signal transmitted by one of the plurality of satellites in the GNSS system; (ii) receive at least one code correction from the augmentation system; (iii) use the at least one code correction to correct the initial code pseudorange measurement and the initial carrier phase measurement to mitigate for errors in the signal, resulting in a corrected code pseudorange measurement and a corrected carrier phase measurement; and (iv) use a code pseudorange dominated measurement in a filter which outputs a position and ambiguity estimate; (v) repeating steps (i) to (iv) until a stable filter output is achieved; and (vi) using a carrier phase dominated measurement in the filter. - View Dependent Claims (19)
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Specification