The invention relates to the field of
underwater acoustic communication, in particular to a differential
Pattern time delay shift coding
underwater acoustic communication method for based on a
parametric array. The method comprises the following steps of generating preformed Pattern code signals and a preformed
synchronizing signal by adopting parametric pre-modulation, wherein one group of the preformed Pattern code signals are produced for modulation and call of a differential time
delay difference; carrying out channel coding on information source information, quantizing and mapping the coding information to a time
delay value, modulating the time delay value on the time delay difference between the preformed Pattern code signals, when the length of a communication
signal reaches one frame, packaging the frame of
signal and adding the preformed
synchronizing signal; and emitting the signal through the
parametric array after power amplification. Through the narrow directional property of difference
frequency sound wave generated by parametric emission, the frequency for reflecting the
sound wave in an interface can be reduced, and the inter-symbol interference caused by multi-path extension is inhibited. Through the narrow directional property of difference
frequency wave of the parametric matrix, the risk of
exposure of an emission node is reduced, and concealment and
confidentiality of communication are improved.