| 摘要 |
For measuring time-of-flight of optical signals traveling between a measurement unit and an optical repeater, the measurement unit emits a first light beam, the repeater detects a portion of the first light beam, and generates a second light beam in response to the first light beam, said first light beam and said second light beam having a determined first time relation, the measurement unit detects a portion of the second light beam returning from the second position, determines a second time relation between the first light beam and the second light beam and determines the time-of-flight of the first and the second beam on the base of the first time relation and the second time relation.
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