Underwater acoustic digital voice communication system and method under quick mobile platform

Abstract

The invention discloses an underwater acoustic digital voice communication system and an underwater acoustic digital voice communication method under a quick mobile platform, and relates to the underwater acoustic digital voice communication system. The communication system is provided with a vocoder and a peripheral circuit, a DSP and a peripheral circuit, a power amplification and matching circuit, a pre-amplifier, a band-pass filter, a power management module and an underwater acoustic transducer. The vocoder and the DSP are connected and communicated with each other via a RS232; the DSP isused for performing modulating / demodulating, frequency hopping / de-hopping, channel / coding / decoding, frame synchronization and Doppler frequency shift estimation and compensation on voice coding data,and communicating with the vocoder; the power amplification and matching circuit is used for amplifying the power of a transmission signal and matching the impedance of a transmitting transducer, andthus maximizing the output power; the band-pass filter filters the out-band noise of the underwater acoustic transducer, particularly low-frequency sea noise; the power management module is used forperforming voltage conversion and stabilization; and the underwater acoustic transducer is applied to conversion between the electrical signal and the acoustic signal or between the acoustic signal and the electrical signal.

Description

technical field [0001] The present invention relates to an underwater acoustic digital voice communication system, in particular to a communication technology combining frequency hopping and multi-ary frequency shift keying to accurately estimate and efficiently compensate Doppler frequency shift, based on a low-rate vocoder and A digital signal processor (Digital Signal Processor, DSP for short) underwater acoustic digital voice communication system under a fast moving platform and a method thereof. Background technique [0002] With the rapid development of marine scientific research, marine resource development and exploration, underwater voice communication has attracted more and more attention. The traditional underwater voice communication adopts a wired method, and the voice output from the receiving end has little distortion and has high intelligibility, naturalness and clarity. However, this wired method has disadvantages such as small range of motion and easy forma...

AI Technical Summary

Problems solved by technology

Due to the small speed of sound in sea water, about 1500m / s, a small relative motion speed may lead to a relatively large Doppler frequency shift, which is very unfavorable for underwater acoustic data transmission

In addition, the Doppler frequency shift will lead to the disappearance of the orthogonality between the subcarriers of underwater acoustic OFDM communication, making the demodulation of the signal more complicated, and the data bit error rate will increase significantly, seriously affecting the communication quality of underwater acoustic digital voice

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