Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With time interval measuring means
Reexamination Certificate
2008-07-29
2008-07-29
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With time interval measuring means
C367S128000
Reexamination Certificate
active
07406000
ABSTRACT:
Provided is a method for controlling a positioning system using ultrasonic waves. The method installs a plurality of ultrasonic satellites generating ultrasonic signals to position a mobile. The method sequentially gives satellite identification numbers to the plurality of ultrasonic satellites, generates a synchronization signal and providing it to the plurality of ultrasonic satellites, and allows the mobile to receive ultrasonic signals, which are generated by the plurality of ultrasonic satellites in the order of the satellite identification numbers when the ultrasonic satellites receive the synchronization signal, to measure distances between the mobile and the ultrasonic satellites. The positioning system includes ultrasonic satellites, a mobile that receives ultrasonic signals from the ultrasonic satellites to recognize its current position, a reference time broadcaster for providing a synchronization signal to ultrasonic satellites and the mobile, and a server for providing the coordinates of the ultrasonic satellites to the mobile.
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Jong C. Park et al., “A Study on Performance Improvement of Ultrasonic Ranging System” 1991, pp. 1209-1213.
Knobbe Martens Olson & Bear LLP
KT Corporation
Pihulic Dan
LandOfFree
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