METHOD FOR POSITIONING PORTABLE COMMUNICATION DEVICE
First Claim
1. A method for positioning a portable communication device comprising the steps of:
- (a) detecting signal intensities of a plurality of base stations near the portable communication device receiving radio waves from the base stations, and finding coordinate of the base stations;
(b) calculating a position coordinate of the portable communication device through the coordinates and the signal intensities of the base stations;
(c) determining values of a plurality of environmental features between at least one of the base stations and the portable communication device from a geographic information system (GIS) according to said at least one coordinate of the base stations and tie position coordinate of the portable communication device;
(d) modifying the signal intensities of the base stations by substituting the values of the environmental features into a path loss model; and
(e) recalculating the position coordinate of the portable communication device through the modified signal intensities of the base stations.
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Accused Products
Abstract
A method for positioning a portable communication device is provided. First, the signal intensities of a plurality of base stations near the portable communication device receiving radio waves from the base stations are detected, and coordinates of the base stations are found in order to calculate a position coordinate of the portable communication device through the coordinates and the signal intensities of the base stations. Then, the values of a plurality of environmental features between at least one of the base stations and the portable communication device are obtained from a geographic information system (GIS) according to at least one coordinate of the base stations and the position coordinate of the portable communication device. After that, the signal intensities of the base stations are modified by substituting the values of the environmental features into a path loss model. Finally, the position coordinate of the portable communication device is recalculated according to the modified signal intensities of the base stations thereby enhancing the positioning accuracy substantially.
15 Citations
20 Claims
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1. A method for positioning a portable communication device comprising the steps of:
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(a) detecting signal intensities of a plurality of base stations near the portable communication device receiving radio waves from the base stations, and finding coordinate of the base stations; (b) calculating a position coordinate of the portable communication device through the coordinates and the signal intensities of the base stations; (c) determining values of a plurality of environmental features between at least one of the base stations and the portable communication device from a geographic information system (GIS) according to said at least one coordinate of the base stations and tie position coordinate of the portable communication device; (d) modifying the signal intensities of the base stations by substituting the values of the environmental features into a path loss model; and (e) recalculating the position coordinate of the portable communication device through the modified signal intensities of the base stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for positioning a portable communication device using a service end device, the method comprising the steps of:
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(a) receiving identification data and signal intensities of a plurality of base stations detected by the portable communication device; (b) determining a regional feature of a region where the portable communication device is located through the identification data and the signal intensities of the base stations; and (c) calculating a position coordinate of the portable communication device according to the identification data and the signal intensities of the base stations, and modifying the position coordinate through the regional feature. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification