GNSS signal processing with ionosphere model for synthetic reference data
First Claim
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1. A method of global navigation satellite systems (GNSS) signal processing, the method comprising:
- receiving, at each of a plurality of reference station receivers, code observations and carrier phase observations of GNSS signals from multiple satellites over multiple epochs, the GNSS signals having at least two carrier frequencies;
resolving a set of network ambiguities by resolving at least a widelane ambiguity per receiver-satellite pairing and a narrowlane ambiguity per receiver-satellite pairing;
determining an ionospheric delay per epoch per receiver-satellite pairing based on a total electron content (TEC) per receiver-satellite pairing provided by an ionospheric model;
estimating an ionospheric phase bias per satellite using ionospheric phase combinations of the carrier phase observations, the set of resolved network ambiguities, and the ionospheric delay per epoch per receiver-satellite pairing determined from the ionospheric model; and
transmitting the ionospheric phase bias to a rover for determining a position of the rover.
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Abstract
Some embodiments of the present invention derive an ionospheric phase bias and an ionospheric differential code bias (DCB) using an absolute ionosphere model, which can be estimated from data obtained from a network of reference stations or obtained from an external source such as WAAS, GAIM, IONEX or other. Fully synthetic reference station data is generated using the ionospheric phase bias and/or the differential code bias together with the phase leveled clock and ionospheric-free code bias and/or MW bias.
98 Citations
29 Claims
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1. A method of global navigation satellite systems (GNSS) signal processing, the method comprising:
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receiving, at each of a plurality of reference station receivers, code observations and carrier phase observations of GNSS signals from multiple satellites over multiple epochs, the GNSS signals having at least two carrier frequencies; resolving a set of network ambiguities by resolving at least a widelane ambiguity per receiver-satellite pairing and a narrowlane ambiguity per receiver-satellite pairing; determining an ionospheric delay per epoch per receiver-satellite pairing based on a total electron content (TEC) per receiver-satellite pairing provided by an ionospheric model; estimating an ionospheric phase bias per satellite using ionospheric phase combinations of the carrier phase observations, the set of resolved network ambiguities, and the ionospheric delay per epoch per receiver-satellite pairing determined from the ionospheric model; and transmitting the ionospheric phase bias to a rover for determining a position of the rover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. Apparatus for processing global navigation satellite systems (GNSS) signal data comprising code observations and carrier-phase observations of GNSS signals received at multiple GNSS receivers from multiple satellites over multiple epochs, the GNSS signals having at least two carrier frequencies, the apparatus comprising a processor, a transmitter, and a memory storing a set of instructions when executed by the processor enabling the processor to:
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resolve a set of network ambiguities by resolving at least a widelane ambiguity per receiver-satellite pairing and a narrowlane ambiguity per receiver-satellite pairing; determine an ionospheric delay per epoch per receiver-satellite pairing based on a total electron content (TEC) per receiver-satellite pairing provided by an ionospheric model; estimate an ionospheric phase bias per satellite using ionospheric phase combinations of the carrier phase observations, the set of resolved network ambiguities, and the ionospheric delay per epoch per receiver-satellite pairing determined from the ionospheric model; and cause the transmitter to transmit the ionospheric phase bias to a rover for determining a position of the rover. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification