doi:
UDK: 681.883

DESCRIPTION OF MODULATION METHOD AND SIGNAL PROCESSING AS PART OF THE DEVELOPMENT SONAR MODEM FOR AUTOMATIC UNDERWATER VEHICLE

Ясинская Ю. В., Курочкин М. А.
Article language: английский

Annotation

In this article the methods of modulation and signal processing are described, the basic advantages of M-QAM modulation, relative to other methods of underwater communication are considered, the basic indicators influencing efficiency of this method in the framework of the decision of a question of fast and effective communication of autonomous underwater vehicles. As part of the study, modulation and comparison of different methods of signal formation was carried out, a detailed analysis of the characteristics of 16-QAM 64-QAM, modulation of the effect of noise factors AWGN, input signal power, phase noise and frequency shift on the characteristics of the BER studied methods of modulation was carried out. Having studied results received during modulation, it follows that with increase of QAM order the simulated BER values also increase that directly affects quality of data transmission, the data received during modulation it is necessary to consider at a choice of a method of modulation of a signal for its use within the limits of the project on creation of AUV communication modules. In the process of hydroacoustic modem development the structural scheme of signal transformation was made, which implements the parallelization of bit data flow for its digital modulation and further processing. Structurally, the model is divided into two channels: a physical one, describing the way of bit transmission through the physical medium of communication lines, and a channel one, designed to transmit the data flow to nodes and error detection and correction. In addition, it also provides noise-correcting coding, introducing redundant bits, provides the receiver with the correct acceptance of the signal. Keywords: sonar modem; signal processing; noise-immune coding; QAM; FFT; AUV

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