Positioning System and Positioning Method
First Claim
1. A positioning system for estimating the position of a receiver that has a wireless communication function and a receiving function for signals used in GPS positioning, the system comprising:
- reception state information acquisition means for acquiring reception state information indicating the reception state of a radio wave produced by the wireless communication function of the receiver;
approximate position estimation means for estimating the approximate position of the receiver and computing the precision of the approximate position on the basis of the reception state information acquired by the reception state information acquisition means;
end decision means for deciding whether or not to end the estimation of the position of the receiver on the basis of the precision computed by the approximate position estimation means, and, if it is decided to end the estimation, estimating the position of the receiver as the approximate position estimated by the approximate position estimation means and ending the estimation of the position;
indoor/outdoor determination means for determining whether the receiver is indoors or outdoors on the basis of the reception state information acquired by the reception state information acquisition means; and
positioning control means for controlling the execution of GPS positioning of the receiver on the basis of a result of decision by the end decision means and a result of determination by the indoor/outdoor determination means.
1 Assignment
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Accused Products
Abstract
It is an object of the present invention to obtain a positioning result corresponding to the state of a receiver in less time. A positioning server 10 comprises a reception state information acquisition component 12 that acquires reception state information indicating the reception state of a radio wave at a cellular terminal 20, a base station positioning calculator 13 that estimates the approximate position of the cellular terminal 20 on the basis of reception state information and computes the precision of the approximate position, an end decision component 14 that decides whether or not to end the estimation of position on the basis of the precision of the approximate position, and, if it is decided to end the estimation, estimates the position of the cellular terminal 20 as the approximate position and ends the estimation of the position, an indoor/outdoor determination component 15 that determines whether the cellular terminal 20 is indoors or outdoors on the basis of the reception state information, and a positioning controller 16 that controls the execution of the GPS positioning of the cellular terminal 20 on the basis of the result of decision by the end decision component 14 and the result of determination by the indoor/outdoor determination component 15.
15 Citations
27 Claims
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1. A positioning system for estimating the position of a receiver that has a wireless communication function and a receiving function for signals used in GPS positioning, the system comprising:
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reception state information acquisition means for acquiring reception state information indicating the reception state of a radio wave produced by the wireless communication function of the receiver; approximate position estimation means for estimating the approximate position of the receiver and computing the precision of the approximate position on the basis of the reception state information acquired by the reception state information acquisition means; end decision means for deciding whether or not to end the estimation of the position of the receiver on the basis of the precision computed by the approximate position estimation means, and, if it is decided to end the estimation, estimating the position of the receiver as the approximate position estimated by the approximate position estimation means and ending the estimation of the position; indoor/outdoor determination means for determining whether the receiver is indoors or outdoors on the basis of the reception state information acquired by the reception state information acquisition means; and positioning control means for controlling the execution of GPS positioning of the receiver on the basis of a result of decision by the end decision means and a result of determination by the indoor/outdoor determination means. - View Dependent Claims (2, 3, 4)
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5. A positioning method for estimating the position of a receiver that has a wireless communication function and a receiving function for signals used in GPS positioning, the method comprising:
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a reception state information acquisition step of acquiring reception state information indicating the reception state of a radio wave produced by the wireless communication function of the receiver; an approximate position estimation step of estimating the approximate position of the receiver and computing the precision of the approximate position on the basis of the reception state information acquired in the reception state information acquisition step; an end decision step of deciding whether or not to end the estimation of the position of the receiver on the basis of the precision computed in the approximate position estimation step, and, if it is decided to end the estimation, estimating the position of the receiver as the approximate position approximate position estimated in the approximate position estimation step and ending the estimation of the position; an indoor/outdoor determination step of determining whether the receiver is indoors or outdoors on the basis of the reception state information acquired in the reception state information acquisition step; and a positioning control step of controlling the execution of GPS positioning of the receiver on the basis of a result of decision in the end decision step and a result of determination in the indoor/outdoor determination step.
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6. A method comprising:
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(a) estimating the location of a wireless terminal via a first technique that does not use the Global Positioning System; (b) initiating estimation of the location of said wireless terminal via a second technique that uses the Global Positioning System when, and only when; (i) the error associated with the estimate obtained by the first technique is above a threshold, and (ii) said wireless terminal is estimated to be outdoors; and (c) transmitting the location estimated by said second technique when said second technique is performed. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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(a) estimating the location of a wireless terminal via a first technique and via a second technique, wherein said first technique does not use the Global Positioning System, and wherein said second technique does not use the Global Positioning System; (b) initiating estimation of the location of said wireless terminal via a third technique that uses the Global Positioning System when, and only when; (i) the error associated with the estimate obtained by the first technique is above a threshold, (ii) the error associated with the estimate obtained by the second technique is above said threshold, and (iii) said wireless terminal is estimated to be outdoors; and (c) transmitting the location estimated by said third technique when said third technique is performed. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method comprising:
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(a) estimating the location of a wireless terminal via a first technique that does not use the Global Positioning System; (b) when the error associated with the estimate obtained by the first technique is above a threshold, estimating the location of said wireless terminal via a second technique that does not use the Global Positioning System; and (c) when the errors associated with the estimates obtained by the first technique and the second technique are both above said threshold, estimating whether or not said wireless terminal is outdoors; and (d) when the errors associated with the estimates obtained by the first technique and the second technique are both above said threshold, and said wireless terminal is estimated to be outdoors; (i) estimating the location of said wireless terminal via a third technique that uses the Global Positioning System, and (ii) transmitting the location estimated by said third technique. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification