Generating high precision ionospheric ground-truth measurements
First Claim
1. A computer-implemented method for providing ionospheric ground-truth measurements for use in a wide-area augmentation system (WAAS), comprising:
- receiving ionospheric pseudorange data and phase data as observables;
performing a polynomial fit on the observables;
examining polynomial fit to identify any cycle slips in the observables;
leveling the phase data using the pseudorange data;
obtaining satellite and receiver biases; and
applying the satellite and receiver biases to the leveled phase data to obtain unbiased phase-leveled ionospheric measurements that are used in a WAAS system.
2 Assignments
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Accused Products
Abstract
A method, apparatus and article of manufacture provide ionospheric ground-truth measurements for use in a wide-area augmentation system (WAAS). Ionospheric pseudorange/code and carrier phase data as primary observables is received by a WAAS receiver. A polynomial fit is performed on the phase data that is examined to identify any cycle slips in the phase data. The phase data is then leveled. Satellite and receiver biases are obtained and applied to the leveled phase data to obtain unbiased phase-leveled ionospheric measurements that are used in a WAAS system. In addition, one of several measurements may be selected and data is output that provides information on the quality of the measurements that are used to determine corrective messages as part of the WAAS system.
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Citations
21 Claims
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1. A computer-implemented method for providing ionospheric ground-truth measurements for use in a wide-area augmentation system (WAAS), comprising:
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receiving ionospheric pseudorange data and phase data as observables; performing a polynomial fit on the observables; examining polynomial fit to identify any cycle slips in the observables; leveling the phase data using the pseudorange data; obtaining satellite and receiver biases; and applying the satellite and receiver biases to the leveled phase data to obtain unbiased phase-leveled ionospheric measurements that are used in a WAAS system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for providing ionospheric ground-truth measurements for use in a Wide-Area Augmentation System (WAAS) comprising a WAAS receiver configured to:
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receive ionospheric pseudorange data and phase data as observables; perform a polynomial fit on the observables; examine the polynomial fit to identify any cycle slips in the observables; level the phase data using the pseudorange data; obtain satellite and receiver biases; and apply the satellite and receiver biases to the leveled phase data to obtain unbiased phase-leveled ionospheric measurements that are used in a WAAS system. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An article of manufacture comprising a program storage medium readable by a computer and embodying one or more instructions executable by the computer to perform a method for providing ionospheric ground-truth measurements for use in a Wide Area Augmentation System (WAAS), the method comprising:
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receiving ionospheric pseudorange data and phase data as observables; performing a polynomial fit on the observables; examining polynomial fit to identify any cycle slips in the observables; leveling the phase data using the pseudorange data; obtaining satellite and receiver biases; and applying the satellite and receiver biases to the leveled phase data to obtain unbiased phase-leveled ionospheric measurements that are used in a WAAS system. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification