Bidirectional positioning system for ubiquitous computing
First Claim
1. A bidirectional positioning system including a plurality of mobile stations radiating ultrasonic signals to notice a physical location of correspondence mobile station and to request additional information, the bidirectional positioning system, comprising:
- a plurality of ultrasonic transceivers for receiving the ultrasonic signal from the plurality of mobile stations and measuring a receiving time of the ultrasonic signal with a correspondence mobile station; and
a positioning server for computing physical locations of the plurality of mobile stations by collecting three or more receiving times of correspondence mobile station from the plurality of ultrasonic transceivers, storing the computed physical locations of the plurality of mobile stations in a database, generating a radio frequency (RF) information signal to have information about computed physical location of the mobile stations by receiving the ultrasonic signal from the plurality of ultrasonic transceivers and transmitting the RF information signal to the mobile stations.
1 Assignment
0 Petitions
Accused Products
Abstract
A bidirectional positioning system is disclosed. The system having a plurality of mobile stations radiating ultrasonic signals to notice a physical location of correspondence mobile station and to request additional information, the bidirectional positioning system, including: a plurality of ultrasonic transceivers for receiving the ultrasonic signal from the plurality of mobile stations and measuring a receiving time of the ultrasonic signal with a correspondence mobile station; and a positioning server for computing physical locations of the plurality of mobile stations by collecting three or more receiving times of correspondence mobile station from the plurality of ultrasonic transceivers, storing the computed physical locations of the plurality of mobile stations in a database, generating a radio frequency (RF) information signal to have information about computed physical location of the mobile stations by receiving the ultrasonic signal from the plurality of ultrasonic transceivers and transmitting the RF information signal to the mobile stations.
18 Citations
20 Claims
-
1. A bidirectional positioning system including a plurality of mobile stations radiating ultrasonic signals to notice a physical location of correspondence mobile station and to request additional information, the bidirectional positioning system, comprising:
-
a plurality of ultrasonic transceivers for receiving the ultrasonic signal from the plurality of mobile stations and measuring a receiving time of the ultrasonic signal with a correspondence mobile station; and
a positioning server for computing physical locations of the plurality of mobile stations by collecting three or more receiving times of correspondence mobile station from the plurality of ultrasonic transceivers, storing the computed physical locations of the plurality of mobile stations in a database, generating a radio frequency (RF) information signal to have information about computed physical location of the mobile stations by receiving the ultrasonic signal from the plurality of ultrasonic transceivers and transmitting the RF information signal to the mobile stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 19)
-
-
15. A method for computing a physical location of mobile stations and sharing information including the physical location in a bidirectional positioning system, the method comprising the steps of:
-
a) at a positioning server, providing a reference time to a mobile station by transmitting a radio frequency (RF) information signal with the reference time through a wireless communication channel, and providing the reference time to a plurality of ultrasonic transceivers by transmitting a reference signal with the reference time through a wired communication channel;
b) at a plurality of ultrasonic transceivers, measuring receiving times with correspondence mobile stations by receiving the ultrasonic signal and delivering the measured receiving times and the ultrasonic signal to the positioning server;
c) at the positioning sever, computing physical locations of the mobile stations by receiving the receiving times of correspondence mobile stations from at least three different ultrasonic transceivers, storing the computed physical locations of the mobile stations and allocating an access channel to the mobile station; and
d) at the positioning server, generating a radio frequency (RF) information signal by inserting information about the computed physical location of the mobile stations and allocated access channel in to the RF information signal and transmitting the RF information signal to the mobile stations. - View Dependent Claims (16, 17, 18)
-
-
20. A computer readable recoding medium for storing instructions of a method for computing a physical location of mobile stations and sharing information including the physical location in a bidirectional positioning system, the method comprising the steps of:
-
a) at a positioning server, providing a reference time to a mobile station by transmitting a radio frequency (RF) information signal with the reference time through a wireless communication channel, and providing the reference time to a plurality of ultrasonic transceivers by transmitting a reference signal with the reference time through a wired communication channel;
b) at a plurality of ultrasonic transceivers, measuring receiving times with correspondence mobile stations by receiving the ultrasonic signal and delivering the measured receiving times and the ultrasonic signal to the positioning server;
c) at the positioning sever, computing physical locations of the mobile stations by receiving the receiving times of correspondence mobile stations from at least three different ultrasonic transceivers, storing the computed physical locations of the mobile stations and allocating an access channel to the mobile station; and
d) at the positioning server, generating a radio frequency (RF) information signal by inserting information about the computed physical location of the mobile stations and allocated access channel in to the RF information signal and transmitting the RF information signal to the mobile stations.
-
Specification