| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of performing bi-directional radio distance measurement without using a component of high accuracy and high stability and a complicated circuit, and without complicated operation. SOLUTION: The accuracy of the bi-directional radio distance measurement is improved by presuming a relative clock frequency difference between a first clock X of a first transceiver and a second clock Y of a second transceiver. The first transceiver transmits a first packet at time t0, and is received by the second transceiver at a time t1. The second transceiver transmits a second packet at a time t2, and is received by the first transceiver at a time t3. The second transceiver transmits a third packet at a time t4, and is received by the first transceiver at a time t5. The relative clock frequency difference is determined based on the delay between time t2 and time t4 and between time t3 and time t5, and the distance between the first transceiver and the second transceiver is determined based on this. COPYRIGHT: (C)2009,JPO&INPIT |
