Cross-ice medium acoustic communication waveform design method

Abstract

The invention discloses a cross-ice medium acoustic communication waveform design method, which comprises the following steps of: acquiring sea ice acoustic parameters, establishing a frequency dispersion equation for describing elastic waveguide characteristics of an ice layer according to an elastic wave theory, solving the frequency dispersion equation to obtain a phase velocity frequency dispersion function cp, obtaining a group velocity frequency dispersion function according to the cp, and further obtaining a group velocity frequency dispersion curve; determining sound source excitation parameters serving as an information source, including an excitation frequency range and a sound energy incident angle range, and selecting a corresponding group velocity frequency dispersion function in the frequency dispersion curve according to the sound source excitation parameters; calculating a system transfer function according to the distance between the receiving end and the transmitting end based on the obtained frequency dispersion function; obtaining a system frequency domain response function based on the system transfer function and the expected pulse signal frequency domain waveform; and converting the frequency domain response function to a time domain, and inverting a time domain waveform to obtain a transmitting end waveform. According to the invention, while the communication distance and the communication reliability are improved, the communication concealment is greatly improved, and efficient, stable and concealed ice-crossing fixed-point acoustic communication is realized.

Description

technical field [0001] The invention belongs to the technical field of polar acoustics, and relates to a wave design method for acoustic communication across ice media. Background technique [0002] The development and utilization of resources in the Arctic region is the focus of the international community. As the basic guarantee for scientific understanding of the polar region and rational development and utilization of polar resources, polar equipment and technology urgently need the support of sea-ice-sky integrated global communication and perception capabilities. The Arctic region is covered by ice and snow all the year round, so the realization of stable, long-distance and efficient cross-ice medium communication technology is of great significance to the formation of polar cross-domain perception and communication networks. [0003] The basic technical route for cross-ice media information acquisition includes two major categories: equipment cross-ice and energy cros...

AI Technical Summary

Problems solved by technology

When the above technology is applied to polar seas to achieve acoustic communication across ice media, the multi-mode propagation and dispersion phenomenon brought about by the ice acoustic waveguide leads to the time-domain broadening of the acoustic energy, which seriously affects the communication effect

On the one hand, the time-domain broadening of the acoustic energy makes the instantaneous, high-amplitude pulse signal become a long-tailed signal after long-distance propagation, and the reduction of the signal amplitude increases the detection difficulty at the receiving end. Signal amplitude, but it leads to a serious reduction in communication concealment and it is difficult for the source and transmitter equipment to support it; on the other hand, nonlinear time-domain broadening increases the error of signal arrival judgment, deteriorating communication efficiency

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