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US 2026/0259330 A1Published application
System and method for improved estimation of spatially-variant gnss signal corrections
AssigneeSwift Navigation, Inc.
InventorsMatthew Peddie, Alexander Thomas Kleeman
Life of this patent
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Abstract
A method for generating ionospheric GNSS corrections can include: receiving satellite observations from one or more reference stations; determining ionosphere observables and associated pierce points on an atmospheric shell; fitting a regression model to estimate an ionospheric correction field; and outputting model parameters for a receiver to determine a corrected ionospheric delay.
Claims20
A method for generating ionospheric Global Navigation Satellite System (GNSS) corrections, comprising:
- receiving, from a set of reference stations, satellite observations corresponding to signals transmitted by a plurality of satellites;
- determining, from the satellite observations, a plurality of ionosphere observables;
- determining, for each ionosphere observable, a corresponding pierce point on an atmospheric shell, wherein the pierce point corresponds to an intersection between a line-of-sight path between a respective reference station and a respective satellite through the atmospheric shell;
- applying a warping function that maps the spatial coordinates from an Earth-fixed coordinate system into a warped coordinate system with reduced spatial correlation anisotropy of ionosphere observables across a geographic region;
- determining a spatial ionospheric correction field in the warped coordinate system by fitting a set of parameters of a regression model using the plurality of ionosphere observables;
- and
- outputting the fitted set of parameters of the regression model and the warping function, wherein a mobile receiver determines a corrected slant ionospheric delay.
4 more elements
A method for generating ionospheric GNSS corrections, comprising:
- receiving, from a set of reference stations, GNSS measurements corresponding to signals transmitted by a plurality of satellites;
- determining, from the GNSS measurements, a plurality of ionosphere observables;
- determining, for each ionosphere observable, a corresponding pierce point on an ionospheric layer;
- selecting a spectral basis defined over a portion of a spherical surface corresponding to the ionospheric layer;
- representing an ionospheric delay field as a truncated spectral expansion comprising a weighted sum of K spectral basis functions and a corresponding set of K weights, wherein K is an integer less than a number of ionosphere observables used;
- estimating the set of K weights using the ionosphere observables and the spectral basis functions;
- and
- generating ionospheric corrections for a mobile receiver by:
- determining, for the mobile receiver and for each satellite in view of the mobile receiver, a receiver pierce point on the ionospheric layer;
- and
- evaluating the truncated spectral expansion at the receiver pierce points to produce ionospheric delay estimates for the mobile receiver.
8 more elements
Dependencies are inferred from the claim text.