Maritime and Ocean Engineering Research Institute (MOERI), Daejeon 305-343, Korea.
J Acoust Soc Am. 2011 Jan;129(1):98-103. doi: 10.1121/1.3514505.
Geoacoustic inversion using fluctuating signal observations can be challenging. The origin of these fluctuations needs to be understood so the signals can be used appropriately. A set of experiments [Tang et al., Oceanogr. 20(4), 156-167 (2007)] was carried out in shallow water near the New Jersey shelf break in summer 2006. Significant fluctuations in the direct path and surface-reflected arrivals of short-range chirp transmissions (1.1-2.9 kHz) were observed on a vertical line array. This paper explains the origin of these signal fluctuations through analysis of the arrival amplitudes. It is shown that the strong thermocline combined with an oscillating source motion due to ocean surface waves results in the signal fluctuations.
利用波动信号观测进行海底声传播反演具有一定的挑战性。需要了解这些波动的来源，以便能够正确地利用这些信号。一组实验（Tang 等人，《海洋学》，20（4），156-167（2007））于 2006 年夏季在新泽西大陆架边缘附近的浅水区进行。在一条垂直线列上观测到短程线性调频传输（1.1-2.9 kHz）直达波和表面反射波的到达幅度有明显的波动。本文通过对到达幅度的分析，解释了这些信号波动的来源。结果表明，强烈的跃变层与海洋表面波引起的源运动的振荡相结合导致了信号的波动。
