This is found by observing the doppler shift in the frequency of the radio signals broadcast from the satellite. 這是通過(guò)觀(guān)測衛星所發(fā)射的無(wú)線(xiàn)電信號頻率中多普勒偏移來(lái)確定的。
By sheer coincidence, a trio of earth-monitoring satellites gave modelers the pristine, undistorted wave heights they needed for the Indian Ocean tsunami. 十分巧合的是，有一組地球觀(guān)測衛星提供了最原始且如實(shí)的海嘯波高值，這是模型設計師模擬印度洋海嘯時(shí)不可或缺的。
