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US 11,378,699 B2Granted
System and method for determining GNSS positioning corrections
AssigneeSwift Navigation, Inc.
InventorsBenjamin Lipeles Segal, Mark Fine, Joseph Angelo, Leith Bade, Fergus MacPherson Noble
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Abstract
A system or method for generating GNSS corrections can include receiving satellite observations associated with a set of satellites at a reference station, determining atmospheric corrections valid within a geographical area; wherein geographical areas associated with different atmospheric corrections can be overlapping, and wherein the atmospheric corrections can be provided to a GNSS receiver when the locality of the GNSS receiver is within a transmission region of the geographical area.
Claims22
A method for generating satellite corrections comprising:
- a) receiving satellite observations associated with a set of satellites at a reference station;
- b) modelling at least one of ionospheric or tropospheric effects as a function of least one of a pierce point or a pierce angle for satellite rays for each satellite of the set of satellites;
- c) fitting the at least one of ionospheric or tropospheric effects to a plurality of polynomial functions, wherein each polynomial function is valid within a unique geographic region, wherein adjacent unique geographic regions are overlapping;
- d) determining a set of grid points comprising residuals of the polynomial fit to the at least one of ionospheric or tropospheric effects model;
- e) determining a locality of the GNSS receiver;
- and
- f) determining the satellite corrections from:
- a polynomial function, of the plurality of polynomial functions, associated with a geographic region matching the locality of the GNSS receiver;
- and
- an interpolated residual determined from grid points proximal the locality of the GNSS receiver.
7 more elements
A method for generating GNSS corrections comprising:
- a) receiving satellite observations associated with a set of satellites at a reference station;
- b) determining atmospheric corrections comprising:
- a set of fitting functions, wherein each fitting function is valid within a unique geographical area, wherein adjacent unique geographic areas overlap by at least 0.1° latitude or 0.1° longitude;
- and
- a set of grid points comprising residual corrections to the set of fitting functions;
- c) determining a locality of the GNSS receiver;
- and
- d) determining the satellite corrections from:
- a fitting function, of the plurality of fitting functions, associated with a geographic region matching the locality of the GNSS receiver, wherein the fitting function is only provided to the GNSS receiver when the locality of the GNSS receiver is within a transmission region of the associated unique geographical area;
- and
- a residual determined from residual corrections associated with grid points proximal the locality of the GNSS receiver.
8 more elements
A method for generating GNSS corrections comprising:
- a) receiving satellite observations associated with a set of satellites at a reference station;
- b) determining atmospheric corrections comprising:
- a set of fitting functions, wherein each fitting function is valid within a unique geographical area, wherein adjacent unique geographic areas overlap by at least 0.1° latitude or 0.1° longitude;
- and
- a set of grid points comprising residual corrections to the set of fitting functions;
- c) determining a locality of the GNSS receiver;
- and
- d) determining the satellite corrections from:
- a fitting function, of the plurality of fitting functions, associated with a geographic region matching the locality of the GNSS receiver, wherein the fitting function is only provided to the GNSS receiver when the locality of the GNSS receiver is within a transmission region of the associated unique geographical area;
- and
- a residual determined from residual corrections associated with grid points proximal the locality of the GNSS receiver;
- wherein determining the atmospheric corrections comprises:
- modelling atmospheric effects as a function of least one of a pierce point or a pierce angle for satellite rays for each satellite of the set of satellites;
- fitting the atmospheric effects model using the set of fitting functions;
- and
- determining residuals of the fit to the atmospheric effects model.
13 more elements
Dependencies are inferred from the claim text.