A waveform design method for cross-ice acoustic communication based on flexural wave

The establishment of a real-time Observation and Communication Network is one of the key topics in the study of the Arctic. In such a particular and harsh environment exhibiting ultra-low temperatures, sea-ice coverage, and geomagnetic polarity simultaneously, wireless communication technology connecting the ocean with the atmosphere with acoustic waves is effective and promising. Aiming at such, a waveform design method is proposed in this manuscript to countermeasure and make use of the dispersion nature of acoustic waves propagating in sea ice. Having considered the energy distribution among guided waves, the flexural wave is selected in this paper for discussion in particular. A temporal signal of the flexural wave is synthesized to take into account the distortion stemming from dispersion and propagation, it's then time-reversed and used as the excitation signal. Under the assumption of reciprocity of acoustic propagation in the ice channel, the energy of this signal is compressed progressively along the time axis during its propagation and repulsed at its predetermined destination. The waveform designing approach is verified through numerical simulation experiment using the Spectral Element Method (SPECFEM2D), the result of which shows that it improves not only the efficiency but also the stability and concealment of cross-ice acoustic communication.