Satellite radiodetermination
First Claim
1. Satellite radiodetermination apparatus, comprising:
- a radio receiver for receiving a multiple frequency ranging signal from a first satellite and a further ranging signal from a second satellite, the radio receiver including;
deriving means for deriving first ionospheric delay data from said multiple frequency ranging signal; and
estimating means for estimating second ionospheric delay data for the further ranging signal on the basis of said first ionospheric delay data.
3 Assignments
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Accused Products
Abstract
A satellite radiodetermination system comprises global navigation service (GNSS) satellites 2 such as GPS satellites, which generate GNSS ranging signals Rn, geostationary satellites 6 which retransmit ranging signals Rg generated at a navigation land earth station (NLES) 8, including augmentation data A, and medium earth orbit (MEO) satellites 10 which generate ranging signals Rm including regional augmentation data RA transmitted from a satellite access node (SAN) 14. The regional augmentation data RA is supplied by regional augmentation systems 21a, 21b.
A navigation receiver 11 receives the ranging signals Rg, Rm, Rn and calculates ionospheric delay values for those ranging signals which are provided on dual frequencies. Using these ionospheric delay values, and optionally the regional augmentation data RA and the augmentation data A, the navigation receiver estimates ionospheric delay values for those ranging signals which are provided on single frequencies. The navigation receiver uses the ranging signals, corrected for ionospheric delay and errors indicated by the augmentation data A and regional augmentation data RA, to calculate position and time accurately.
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Citations
9 Claims
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1. Satellite radiodetermination apparatus, comprising:
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a radio receiver for receiving a multiple frequency ranging signal from a first satellite and a further ranging signal from a second satellite, the radio receiver including; deriving means for deriving first ionospheric delay data from said multiple frequency ranging signal; and estimating means for estimating second ionospheric delay data for the further ranging signal on the basis of said first ionospheric delay data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of satellite radiodetermination, comprising receiving at a receiver a multiple frequency ranging signal from a first satellite;
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receiving at the receiver a further ranging signal from a second satellite, deriving at the receive first ionospheric delay data from said multiple frequency ranging signal; and estimating at the receiver second ionospheric delay data for the further ranging signal on the basis of said first ionospheric delay data.
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Specification