POSITIONING SYSTEM USING ULTRASONIC WAVES AND METHOD FOR OPERATING THE SAME
First Claim
1. A method for operating a mobile device positioning system, the method comprising:
- providing a mobile device positioning system comprises a plurality of ultrasonic signal transmitters;
generating a synchronization signal for synchronizing the plurality of ultrasonic signal transmitters;
transmitting an ultrasonic signal from each of the plurality of ultrasonic signal transmitters after the synchronization signal in a predetermined order of the plurality of ultrasonic signal transmitters; and
receiving, by the mobile device, each transmitted ultrasonic signal so as to compute a distance between the mobile device and each of the plurality of ultrasonic signal transmitters.
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Abstract
Provided are a positioning system using ultrasonic waves and a method for controlling the positioning system. The method for controlling a positioning system 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 using ultrasonic waves includes ultrasonic satellites generating ultrasonic signals, a mobile that receives the ultrasonic signals from the ultrasonic satellites to recognize its current position, a reference time broadcasting device for providing a synchronization signal to ultrasonic satellites currently operating among the ultrasonic satellites and the mobile, and a server for providing the coordinates of the ultrasonic satellites to the mobile.
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Citations
20 Claims
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1. A method for operating a mobile device positioning system, the method comprising:
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providing a mobile device positioning system comprises a plurality of ultrasonic signal transmitters; generating a synchronization signal for synchronizing the plurality of ultrasonic signal transmitters; transmitting an ultrasonic signal from each of the plurality of ultrasonic signal transmitters after the synchronization signal in a predetermined order of the plurality of ultrasonic signal transmitters; and receiving, by the mobile device, each transmitted ultrasonic signal so as to compute a distance between the mobile device and each of the plurality of ultrasonic signal transmitters. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a mobile device positioning system, wherein a positioning system comprises a plurality of ultrasonic signal transmitters, the method comprising:
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assigning an identification number to each of the plurality of ultrasonic signal transmitters; and transmitting an ultrasonic signal from each of the plurality of ultrasonic signal transmitters in a predetermined order of the plurality of ultrasonic signal transmitters for transmitting the ultrasonic signals, wherein each of the plurality of ultrasonic signal transmitters transmits the ultrasonic signal with a time delay after a synchronization signal, wherein the delay time for each of the plurality of ultrasonic signal transmitters is predetermined according to the predetermined order. - View Dependent Claims (9, 10, 11, 12)
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13. A method of determining a position of a mobile device, the method comprising:
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receiving, by a mobile device, a synchronization signal; synchronizing the mobile device based on the synchronization signal; receiving, by the mobile device, a first ultrasonic signal transmitted from a first source located at a first source location at a first transmission time, which is after a first predetermined interval from the first source'"'"'s receipt of the synchronization signal, wherein the first ultrasonic signal does not comprises information indicative the first transmission time; and computing a first distance between the mobile device and the first source location using the first predetermined interval and further using a first transmission time difference between receipt of the first ultrasonic signal and receipt of the synchronization signal by the mobile device; receiving, by the mobile device, a second ultrasonic signal transmitted from a second source located at a second source location at a second transmission time, which is after a second predetermined interval from the second source'"'"'s receipt of the synchronization signal, wherein the second ultrasonic signal does not comprises information indicative the second transmission time; and computing a second distance between the mobile device and the second source location using the second predetermined interval and further using second transmission time difference between receipt of the second ultrasonic signal and receipt of the synchronization signal by the mobile device; and determining the mobile device'"'"'s position using the first distance and the second distance. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification