The earth's rotation and its motion around the sun add an appreciable frequency shift. 地球自轉與地球繞日公轉產生附加的頻移。
The Brillouin frequency shift can be precisely measured by changing the local frequency and adopting narrow filter. 通過改變本地電信號的頻率對信號進行掃描和窄帶濾波，從而實現了布里淵頻移的精確測量。
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