Method and system for minimizing storage and processing of ionospheric grid point correction information
AssigneeGarmin Ltd.
InventorsClayton Barber, Cliff Pemble
Life of this patent
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Abstract
A method and system are provided for minimizing storage and processing of ionospheric grid point corrections transmitted from WAAS satellites in a global positioning system. Based upon a current location, the system creates a boundary around the current location and collects ionospheric grid point corrections within the boundary. The collected correction points are used to correct the position initially determined by a global positioning system.
Claims20
A method in a position-determining system for minimizing storage and processing of atmospheric correction data, the method comprising:
- determining a current position;
- creating a boundary that defines an area within which is located the current position;
- and
- obtaining only a portion of the atmospheric correction data that relates to the area defined by the boundary.
A method in a global positioning system for minimizing storage and processing of ionospheric correction data, the method comprising:
- determining a current position;
- creating a boundary that defines an area within which is located the current position, wherein the boundary is based upon a latitude range and a longitude range, with the latitude range and the longitude range being pre-determined and stored for subsequent use;
- and
- obtaining only a portion of the ionospheric correction data that relates to the area defined by the boundary.
A method in a position-determining system for minimizing storage and processing of atmospheric correction data, the method comprising:
- determining a current position;
- creating a boundary that defines an area within which is located the current position, wherein the boundary is based upon a latitude range and a longitude range such that
- if a latitude of the current position is approximately 0 degrees, then latitude range and the longitude range are approximately equal, and
- if the latitude of the current position is greater than 70 degrees or less than −70 degrees, then the longitude range is approximately 360 degrees;
- and
- storing and processing only a portion of the atmospheric correction data that relates to the area defined by the boundary.
Dependencies are inferred from the claim text.