System and method for position estimation with high accuracy and a wireless communication terminal device therefor
First Claim
1. A method for position estimation for estimating a position of a plurality of target terminal devices in a wireless network, the plurality of target terminal devices being a subject for position estimation and having a function of wireless communication, the wireless network including a plurality of reference terminal devices for wireless communication and having an installed position known, said method comprising:
- a first step of transmitting information on the installed position from each of the reference terminal devices;
a second step of receiving a radio signal from each of the reference terminal devices by the target terminal devices, and acquiring the information used for position estimation from the radio signals; and
a third step of estimating the position of the target terminal devices based on information for position estimation acquired in the target terminal devices, position information of the reference terminal devices and distance information on distances by which a plurality of wireless devices owned by each of the target terminal devices are separated from one another.
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Accused Products
Abstract
A position estimation system acquires the information used for position estimation from radio signals. The system finds estimated positions of a plural number of radio devices, based at least on the information used for position estimation acquired, the positions of reference terminal devices and the distances by which the radio devices are separated from one another. The system estimates the position of a target terminal device based on estimated positions of plural receiving processors.
31 Citations
23 Claims
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1. A method for position estimation for estimating a position of a plurality of target terminal devices in a wireless network, the plurality of target terminal devices being a subject for position estimation and having a function of wireless communication, the wireless network including a plurality of reference terminal devices for wireless communication and having an installed position known, said method comprising:
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a first step of transmitting information on the installed position from each of the reference terminal devices;
a second step of receiving a radio signal from each of the reference terminal devices by the target terminal devices, and acquiring the information used for position estimation from the radio signals; and
a third step of estimating the position of the target terminal devices based on information for position estimation acquired in the target terminal devices, position information of the reference terminal devices and distance information on distances by which a plurality of wireless devices owned by each of the target terminal devices are separated from one another. - View Dependent Claims (2, 3)
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4. A method for position estimation for estimating a position of a plurality of target terminal devices in a wireless network, the plurality of target terminal devices being a subject for position estimation and having a function of wireless communication, the wireless network including a plurality of reference terminal devices for wireless communication and having an installed position known, said method comprising:
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a first step of transmitting a information from each of the target terminal devices;
a second step of receiving the information from the target terminal devices at each of the reference terminal devices and transmitting a radio signal including information produced responsive to the received information from each of the reference terminal devices to the target terminal devices; and
a third step of estimating the position of the target terminal devices based on information for position estimation acquired from the radio signals received by the target terminal devices, the position of the reference terminal devices and distance information on a distance by which a plurality of radio devices owned by the target terminal devices are separated from one another. - View Dependent Claims (5, 6)
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7. A position estimation system comprising:
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a target terminal device having a plurality of radio devices, a distance of which from one another is known;
a plurality of reference terminal devices arranged at known positions, said reference terminal devices transmitting and receiving radio signals to and from said target terminal device; and
a position estimator for estimating the position of said target terminal device, based on the radio signal, the position of said reference terminal devices and a distance by which said radio devices are separated from one another;
said position estimator acquiring information for position estimation from the radio signals;
said position estimator finding an estimated position of said radio devices based at least on the information for position estimation acquired, the position of said reference terminal devices and on the positional relationship of said radio devices inclusive of the distance by which the radio devices are separated from one another;
said position estimator estimating the position of said target terminal device based on the estimated position of said radio devices. - View Dependent Claims (8, 9, 10)
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11. A position estimation system comprising:
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a target terminal device having a plurality of radio devices, a distance of which from one another is known;
a plurality of reference terminal devices arranged at a known position for transmitting and receiving a radio signal to and from said target terminal device; and
a position estimator for estimating a position of said target terminal device, based on the radio signal, the position of said reference terminal devices and the distance by which said radio devices are separated from one another;
said position estimator acquiring information for position estimation from the radio signal and finding a first estimated position information in each of said radio devices based at least on information for position estimation acquired and on the position of said reference terminal devices;
said position estimator finding a second estimated position information in said radio devices based at least on the first estimated position information in each radio device, the distance by which said radio devices are separated from one another, the information for position estimation, acquired form the radio signal, and the position of said reference terminal devices;
said position estimator estimating the position of said target terminal device based on the second estimated position information in said radio devices. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification