GNSS navigation aided by static data
AssigneeCellguide Ltd.
InventorsDvir Rosenfeld, Boaz Efroni Rotman
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Abstract
A GNSS receiver includes a RF front end for receiving GNSS ranging signals, a navigation processor for calculating location from the ranging signals, and a repository of static data. The navigation processor includes the static data in the location calculation. Examples of static data include a digital elevation map, coordinates of tunnel entrances for use when the receiver resumes reception of the signals upon exiting a tunnel, and descriptions of structures in sufficient detail to enable multipath mitigation.
Claims10
A Global Navigation Satellite System (GNSS) receiver comprising:
- (a) a radio frequency front end for receiving ranging signals from satellites of a GNSS constellation;
- (b) a navigation processor for calculating a location of the GNSS receiver from said ranging signals;
- and
- (c) a repository of data selected from the group consisting of:
- (i) a digital elevation map,
- (ii) a tunnel database that includes coordinates of at least one entrance of at least one tunnel, and
- (iii) a structure database that includes, for each of at least one structure, a respective description of said each structure in sufficient detail to model multipath reception of said ranging signals by said radio frequency front end when the GNSS receiver is within a respective multipath distance of said each structure;
- wherein said navigation processor is operative to include at least a portion of said data in said calculating of said location of the GNSS receiver.
A navigation method comprising the steps of:
- (a) storing, in a Global Navigation Satellite System (GNSS) receiver that receives ranging signals from satellites of a GNSS constellation and calculates its location from said ranging signals, data selected from the group consisting of:
- (i) a digital elevation map,
- (ii) a tunnel database that includes coordinates of at least one entrance of at least one tunnel, and
- (iii) a structure database that includes, for each of at least one structure, a respective description of said each structure in sufficient detail to model multipath reception of said ranging signals by said GNSS receiver when said GNSS receiver is within a respective multipath distance of said each structure;
- and
- (b) including at least a portion of said data in said calculating of said location by said GNSS receiver.
Dependencies are inferred from the claim text.