Portable telephone, positioning selecting method therefor and program thereof
First Claim
1. A portable telephone capable of determining the location of the telephone with a global positioning system, wherein the telephone has calculation means for calculating a distance between an objective point and the location of the telephone, determination means for determining an existence area where the telephone is located according to the calculated distance, and selection means for selecting one positioning method from positioning methods of different positioning accuracies according to the determination results.
1 Assignment
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Accused Products
Abstract
To provide a portable telephone capable of reducing power consumption and shortening positioning time.
A control portion stores latitude and longitude information inputted from an input portion in a storage portion, and starts positioning of a location of a portable telephone. On first positioning, the control portion performs GPS positioning, receives GPS data from a GPS antenna, and has the latitude and longitude information of the portable telephone calculated by a GPS portion so as to store it in the storage portion. A distance calculation portion calculates a distance between the location of the telephone and an objective point based on the latitude and longitude information of the objective point registered at the start and the latitude and longitude information of the telephone, and stores it in the storage portion. A positioning method determination portion selects a positioning method to be implemented on a next positioning based on the calculated distance.
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Citations
13 Claims
- 1. A portable telephone capable of determining the location of the telephone with a global positioning system, wherein the telephone has calculation means for calculating a distance between an objective point and the location of the telephone, determination means for determining an existence area where the telephone is located according to the calculated distance, and selection means for selecting one positioning method from positioning methods of different positioning accuracies according to the determination results.
- 7. A positioning selecting method of a portable telephone capable of determining the location of the telephone with a global positioning system, wherein the method has a calculation step of calculating a distance between an objective point and the location of the telephone, a determination step of determining an existence area where the telephone is located according to the calculated distance, and a selection step of selecting one positioning method from positioning methods of different positioning accuracies according to the determination results.
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13. A program of a positioning selecting method of a portable telephone capable of determining the location of the telephone with a global positioning system, wherein said program causes a computer to execute a process of calculating a distance between an objective point and the location of the telephone, a process of determining an area where the telephone is located according to the calculated distance, and a process of selecting one positioning method from positioning methods of different positioning accuracies according to the determination results.
Specification