Radio positioning system
First Claim
1. A radio positioning system, comprising:
- a plurality of base stations, each receiving a radio wave from a mobile terminal, and including a first base station whose position coordinates are known and a second base station whose position coordinates are unknown;
a distance measuring unit that measures a distance between the first and the second base stations based on a result of exchanging radio waves between the first and the second base stations;
a position-coordinate calculating unit that calculates position coordinates of the second base station based on the measured distance;
a determination control unit that determines a time reference station out of the base stations, and controls the time reference station to transmit a time reference pulse; and
a control unit that calculates a time difference between reception times at which the base stations receive the wave signal from the mobile terminal, and calculates position coordinates of the mobile terminal based on the time difference.
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Accused Products
Abstract
A radio positioning system includes a plurality of base stations, each receiving a radio wave from a mobile terminal, and including a first base station whose position coordinates are known and a second base station whose position coordinates are unknown. The system also includes a distance measuring unit that measures a distance between the first and the second base stations based on the exchanging the radio waves; a position-coordinate calculating unit that calculates position coordinates of the second base station based on the measured distances; a determination control unit that determines a time reference station out of the base stations, and controls the time reference station to transmit a time reference pulse; and a distance-measurement control unit that calculates, using the time difference, a time difference between reception times of the wave signal at the base stations, and calculates position coordinates of the mobile terminal based on the time difference.
28 Citations
21 Claims
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1. A radio positioning system, comprising:
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a plurality of base stations, each receiving a radio wave from a mobile terminal, and including a first base station whose position coordinates are known and a second base station whose position coordinates are unknown; a distance measuring unit that measures a distance between the first and the second base stations based on a result of exchanging radio waves between the first and the second base stations; a position-coordinate calculating unit that calculates position coordinates of the second base station based on the measured distance; a determination control unit that determines a time reference station out of the base stations, and controls the time reference station to transmit a time reference pulse; and a control unit that calculates a time difference between reception times at which the base stations receive the wave signal from the mobile terminal, and calculates position coordinates of the mobile terminal based on the time difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio positioning server apparatus used in a system including a plurality of base stations each receiving a radio wave from a mobile terminal, the base stations including a first base station whose position coordinates are known and a second base station whose position coordinates are unknown, the apparatus comprising:
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a distance measuring unit that measures a distance between the first and the second base stations based on a result of exchanging radio waves between the first and the second base stations; a position-coordinate calculating unit that calculates position coordinates of the second base station based on the measured distance; a determination control unit that determines a time reference station out of the base stations, and controls the time reference station to transmit a time reference pulse; and a control unit that calculates a time difference between reception times at which the base stations receive the wave signal from the mobile terminal, and calculates position coordinates of the mobile terminal based on the time difference.
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12. A method of radio positioning a mobile terminal in a system including a plurality of base stations, the base stations including a first base station whose position coordinates are known and a second base station whose position coordinates are unknown, the method comprising:
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exchanging radio waves between the first and the second base stations; measuring a distance between the first and the second base stations based on a result of exchanging radio waves between the first and the second base stations; calculating position coordinates of the second base station based on the measured distance; determining a time reference station out of the base stations; controlling the time reference station to transmit a time reference pulse; calculating a time difference between reception times at which the base stations receive the wave signal from the mobile terminal; and calculating position coordinates of the mobile terminal based on the time difference. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification