APPARATUS FOR SYNCHRONIZING CLOCK IN REAL-TIME LOCATING SYSTEM AND METHOD THEREFOR
First Claim
1. A highly precise clock synchronization apparatus in a real-time locating system (RTLS), comprising:
- an optical transmitting/receiving means for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in serial-to-parallel, and transmitting/receiving the clock information data and the clock information;
an offset estimation means for detecting a preamble signal and a clock information signal from the serial-to-parallel converted clock information frame, calculating a phase difference value by comparing the detected preamble signal with the detected clock information frame, and outputting an offset value based on the calculated phase difference value; and
a clock synchronization means for updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame.
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Accused Products
Abstract
A highly precise clock synchronization apparatus in a real-time locating system (RTLS), includes an optical transmitting/receiving unit for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in series-parallel, and transmitting/receiving the clock information data and the clock information; an offset estimation unit for detecting a preamble signal and a clock information signal from the series-parallel converted clock information frame, calculating a phase difference value by comparing the detected preamble signal with the detected clock information signal, and outputting an offset value based on the calculated phase difference value; and a clock synchronization unit for updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame.
20 Citations
9 Claims
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1. A highly precise clock synchronization apparatus in a real-time locating system (RTLS), comprising:
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an optical transmitting/receiving means for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in serial-to-parallel, and transmitting/receiving the clock information data and the clock information; an offset estimation means for detecting a preamble signal and a clock information signal from the serial-to-parallel converted clock information frame, calculating a phase difference value by comparing the detected preamble signal with the detected clock information frame, and outputting an offset value based on the calculated phase difference value; and a clock synchronization means for updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for synchronizing a highly precise clock in a real-time locating system (RTLS), comprising:
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receiving a clock information frame from a clock synchronization server and checking the identifier information of the received clock information frame; in case that the received clock information frame is the frame to be received according to the checked result, detecting a preamble signal and a clock information signal from the received clock information frame, and calculating a phase difference value by comparing the detected preamble signal and the detected clock information signal; calculating an offset value based on the phase difference value; and updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame. - View Dependent Claims (8, 9)
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Specification