Moving Acoustic Source Transmission Trial in the Marginal Ice Zone of the Arctic

A moving acoustic source transmission trial was conducted on the edge of the Canadian Basin during the Arctic Research Expedition. The sound source towed by the ship emits CW-LFM signals of 600-800Hz, and the signals are collected by an autonomous hydrophone. The matched filter result shows a clear multiple reflection structure, and as the distance increases, the time delay between multi-path gradually decreases. By comparing with the simulated channel impulse response, the source of the reflected signal is confirmed. The direct wave and reflections produce strong interference in the receiving end. In addition, there is an obvious convergence zone at a distance of 6 kilometers. Finally, this paper compares the transmission loss (TL) in the trial and the theoretical cylinder TL results. It turns out that the propagation loss in the trial roughly follows the cylinder expansion loss.