Method for calculating the position of a mobile terminal, positioning system, and position calculation apparatus
First Claim
1. A method for calculating the position of a mobile terminal, using differences between propagation distances of radio signals being transmitted and/or received on channels between base stations and a mobile terminal, said method comprising:
- measuring differences between propagation distances of radio signals on channels between a plurality of base stations and a mobile terminal;
determining if the mobile terminal is located in close proximity to a base station;
calculating the position of the mobile terminal by a common formula if it is determined that said mobile terminal is not in close proximity to any of said base stations;
calculating the position of the mobile terminal in close proximity to a base station if it is determined that said mobile terminal is in close proximity to one of said base stations; and
outputting the position of the mobile terminal calculated.
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Accused Products
Abstract
In the present invention, even if a mobile terminal is close to a base station, the position of the mobile terminal is measured accurately. The disclosed method for calculating the position of a mobile terminal comprises: measuring the differences between the propagation distances of the signals on the channels between a plurality of base stations and the mobile terminal; determining if the mobile terminal is close to a base station; calculating the position of the mobile terminal by a common formula if it is determined that the mobile terminal is not in close proximity to any of the base stations; calculating the position of the mobile terminal in close proximity to a base station if it is determined that the mobile terminal is in close proximity to one of the base stations; and outputting the position of the mobile terminal calculated through either of the routines for calculating the mobile terminal position.
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Citations
17 Claims
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1. A method for calculating the position of a mobile terminal, using differences between propagation distances of radio signals being transmitted and/or received on channels between base stations and a mobile terminal, said method comprising:
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measuring differences between propagation distances of radio signals on channels between a plurality of base stations and a mobile terminal;
determining if the mobile terminal is located in close proximity to a base station;
calculating the position of the mobile terminal by a common formula if it is determined that said mobile terminal is not in close proximity to any of said base stations;
calculating the position of the mobile terminal in close proximity to a base station if it is determined that said mobile terminal is in close proximity to one of said base stations; and
outputting the position of the mobile terminal calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A positioning system which measures reception timing of radio signals being transmitted and/or received on channels between base stations and a mobile terminal and calculates the position of the mobile terminal, using differences between propagation distances of the radio signals, said positioning system comprising:
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receiving radio signals in a signal receiver transmitted on channels between a plurality of base stations and a mobile terminal; and
measuring the differences between propagation distances of the received radio signals in a processor, determining if the mobile terminal is in close proximity to a base station in a determining unit;
calculating the position of the mobile terminal by a common formula if it is determined that said mobile terminal is not in close proximity to any of said base stations in a calculating unit;
calculating the position of the mobile terminal in close proximity to a base station if it is determined that said mobile terminal is in close proximity to one of said base stations in said calculating unit; and
outputting the position of the mobile terminal to an output terminal calculated by the common formula or calculated to be in close proximity to a base station. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A position calculation apparatus which receives radio signals being transmitted/received on channels between base stations and a mobile terminal and calculates the position of the mobile terminal, using differences between propagation distances of the radio signals, said position calculation apparatus comprising:
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a unit for measuring the differences between propagation distances of the signals on the channels between a plurality of base stations and a mobile terminal;
a second unit for determining if the mobile terminal is close to a base station, which determines whether said mobile terminal is in close proximity to any of said base stations;
a third unit for calculating the position of the mobile terminal by a common formula if it is determined that said mobile terminal is not in close proximity to any of said base stations;
wherein said third unit may also calculate the position of the mobile terminal in close proximity to a base station if it is determined that said mobile terminal is in close proximity to one of said base stations; and
an output terminal for outputting the position of the mobile terminal calculated by said third unit after calculating the mobile terminal position in close proximity to a base station, or for outputting the position of the mobile terminal calculated by said third unit after calculating the mobile terminal position by a common formula.
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Specification