Autonomous ultrasonic indoor location system, apparatus and method
First Claim
1. A location-beacon receiving apparatus for receiving a location-beacon from a transmitting apparatus, comprisinga first-signal receiver for receiving a first-signal containing synchronization information;
- a second-signal receiver for sequentially receiving second-signals;
a synchronizing unit configured to synchronize with the transmitting apparatus utilizing the synchronization information contained in the first-signal and obtaining a synchronization timing;
an order identification unit configured to indentify a transmission order for the respective second-signals received by the second-signal receiver based on the synchronization timing;
a TOA acquisition unit configured to acquire a TOA information sequence corresponding to the respective second-signals based on the transmission order of the respective second-signals identified by the order identification unit; and
a position calculation unit configured to calculate the position of the receiving apparatus based on the positions of the transmitting sources of the respective second-signals received by the second-signal receiver and the TOA information sequence acquired by the TOA acquiring unit.
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Accused Products
Abstract
An autonomous ultrasonic indoor location system includes a location beacon transmitting apparatus and a location beacon receiving apparatus. The location beacon transmitting apparatus is configured to sequentially transmit US signals at a predetermined time interval upon transmission of a signal containing synchronization information. The location beacon receiving apparatus is configured to synchronize with the location transmitting apparatus when synchronization information is detected, determine transmission order of the received US signals based on the obtained synchronization timing, infer transmission timings of the respective US signals based on the determined transmission order, calculate TOA information corresponding to each of the received US signal from the transmission timings and reception timings of the respective US signals, and determine location of the location beacon receiving apparatus on basis of the positions of the US transmitters in the transmitting apparatus and the calculated TOA information sequence.
49 Citations
22 Claims
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1. A location-beacon receiving apparatus for receiving a location-beacon from a transmitting apparatus, comprising
a first-signal receiver for receiving a first-signal containing synchronization information; -
a second-signal receiver for sequentially receiving second-signals; a synchronizing unit configured to synchronize with the transmitting apparatus utilizing the synchronization information contained in the first-signal and obtaining a synchronization timing; an order identification unit configured to indentify a transmission order for the respective second-signals received by the second-signal receiver based on the synchronization timing; a TOA acquisition unit configured to acquire a TOA information sequence corresponding to the respective second-signals based on the transmission order of the respective second-signals identified by the order identification unit; and a position calculation unit configured to calculate the position of the receiving apparatus based on the positions of the transmitting sources of the respective second-signals received by the second-signal receiver and the TOA information sequence acquired by the TOA acquiring unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for receiving a location beacon in a receiving apparatus from a transmitting apparatus, comprising the steps of
receiving a first-signal containing synchronization information, synchronizing with the transmitting apparatus by utilizing the synchronization information, and obtaining a synchronization timing; -
sequentially receiving second-signals; determining a transmission order for the respective second-signals received based on the synchronization timing; acquiring a TOA information sequence corresponding to the respective second-signal based on the identified transmission order; and calculating the position of the receiving apparatus according to the positions of the transmitting sources of the respective second-signals and the acquired TOA information sequence. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification