Method and apparatus for geographically aiding navigation satellite system solution
First Claim
1. A method for improving positional accuracy of a receiver that receives satellite signals for navigation, the method comprising:
- deriving an initial location from a navigation satellite system (NSS) data received at a GPS receiver, wherein the initial location is determined to be within an area of interest;
receiving selective cartography information from a location-aiding device coupled to the receiver, wherein the selective cartography information includes attributes of one or more geographic objects within the area of interest;
overlaying the initial location onto the selective cartography information;
deriving positional correction from the NSS data and the selective cartography information, wherein the deriving of the positional correction includes determining whether a radial positional correction, a perpendicular positional correction, or a combination thereof is applicable based on a proximity of the initial location with respect to the attributes of the one or more geographic objects;
applying the derived positional correction to the initial location to determine a corrected location of the receiver; and
outputting the corrected location of the receiver.
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Accused Products
Abstract
The present invention is related to position calculation and navigation systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver'"'"'s navigation solutions. According to a first aspect, selective cartography information from a map database accessed by a GPS receiver from a location-aiding device is integrated into the position calculations performed by the GPS receiver. According to another aspect, selective cartography information includes indices representing associated attributes of geographical objects, such as, a width-indicator index for a road segment.
29 Citations
23 Claims
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1. A method for improving positional accuracy of a receiver that receives satellite signals for navigation, the method comprising:
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deriving an initial location from a navigation satellite system (NSS) data received at a GPS receiver, wherein the initial location is determined to be within an area of interest; receiving selective cartography information from a location-aiding device coupled to the receiver, wherein the selective cartography information includes attributes of one or more geographic objects within the area of interest; overlaying the initial location onto the selective cartography information; deriving positional correction from the NSS data and the selective cartography information, wherein the deriving of the positional correction includes determining whether a radial positional correction, a perpendicular positional correction, or a combination thereof is applicable based on a proximity of the initial location with respect to the attributes of the one or more geographic objects; applying the derived positional correction to the initial location to determine a corrected location of the receiver; and outputting the corrected location of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for improving positional accuracy of a receiver that receives satellite signals for navigation, wherein the system comprises:
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a navigation device containing the receiver; and a location-aiding device for pre-storing units of cartography information associated with an area of interest, from which selective cartography information is extracted, wherein the location-aiding device comprises one or more of a remote server, and, an on-board computer external to the navigation device but located within a moving object that includes the navigation device, wherein the navigation device determines whether a radial positional correction, a perpendicular positional correction, or a combination thereof is applicable to improve the positional accuracy of an initial location calculated from the received satellite signals, the determination being based on a proximity of the initial location with respect to attributes of one or more geographic objects included in the extracted selective cartography information.
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Specification