METHOD AND SYSTEM FOR GPS AUGMENTATION USING COOPERATIVE ALTITUDE LEARNING
First Claim
1. A method for GPS augmentation comprising the steps of:
- in a particular vehicle currently located in a particular road section;
a) cooperatively learning an averaged external altitude for the particular road section;
b) obtaining a current internal altitude; and
c) using the cooperatively learned averaged external altitude and the current internal altitude to obtain an augmented altitude for the particular road section.
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Accused Products
Abstract
A method for GPS augmentation in a local vehicle located in a particular road section comprises cooperatively learning an averaged external altitude for the particular road section, obtaining an internal altitude for the particular road section, and using the averaged external altitude and the internal altitude to obtain an augmented local altitude for the particular road section. The augmented local altitude is then used to provide an augmented position for the particular road section. The averaged external altitude is learned cooperatively, using external altitudes obtained for the particular road section and transmitted by other vehicles which previously passed through that section. Only reliable external altitude values, as determined from respective VDOP parameters, are used in the cooperative altitude learning.
50 Citations
18 Claims
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1. A method for GPS augmentation comprising the steps of:
- in a particular vehicle currently located in a particular road section;
a) cooperatively learning an averaged external altitude for the particular road section; b) obtaining a current internal altitude; and c) using the cooperatively learned averaged external altitude and the current internal altitude to obtain an augmented altitude for the particular road section. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- in a particular vehicle currently located in a particular road section;
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8. A method for GPS augmentation comprising the steps of:
- in a vehicle;
a) building an internal map which divides a road travelled by the vehicle into sections, each road section having respective position, averaged external altitude and averaged external vertical dilution of precision (VDOP) values associated therewith and stored in an internal database in the vehicle; b) obtaining an internal altitude for a particular road section in which the vehicle is local; c) weighting the internal altitude with an averaged external altitude for the particular road section to obtain an augmented altitude for the particular road section; and d) using the augmented altitude to provide an augmented position for the particular road section. - View Dependent Claims (9, 10, 11, 12, 13)
- in a vehicle;
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14. A system for GPS augmentation installed in a vehicle and comprising:
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a) a vehicle-to-vehicle communication unit which exchanges periodically GPS information with other vehicles; b) a modified GPS receiver which provides internal position, altitude and vertical dilution of precision (VDOP) inputs associated with a particular road section in which the vehicle is local and which calculates an augmented position for the particular road section; c) a cooperative altitude learning module for weighting the internal altitude input with an averaged external altitude learned by the vehicle, to obtain an augmented altitude for the particular road section, the augmented altitude fed to the modified GPS receiver to calculate the augmented position for the particular road section; and d) a database for storing and periodically updating an internal map of road section and altitude, position and VDOP values associated with each road section. - View Dependent Claims (15, 16, 17, 18)
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Specification