A method of underwater acoustic communication based on differential pattern delay difference coding based on parametric array

Abstract

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.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater acoustic communication method based on a parameter array-based differential pattern delay difference coding. Background technique [0002] Differential Pattern delay difference coding communication (DPDS) belongs to pulse position coding, which uses the time difference of adjacent symbols to carry information. Compared with Pattern delay difference coding underwater acoustic communication method, differential Pattern delay difference coding underwater acoustic communication technology It effectively inherits the ability of the Pattern time-delay coding underwater acoustic communication system to resist multi-channel expansion. In addition, it also effectively improves the communication rate and has better anti-Doppler ability. The traditional differential pattern delay difference encoding underwater acoustic communication method uses traditional tran...

AI Technical Summary

Problems solved by technology

The traditional differential pattern delay difference encoding underwater acoustic communication method uses traditional transmitting transducers to radiate sound waves. In order to obtain a longer communication distance, it is necessary to use low-frequency bands for communication. At this time, the available bandwidth will become very narrow and severely limit communication. rate, for this reason the present invention aims to combine the differential Pattern delay difference encoding system to seek a more effective transmission mode

Images