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Article title WAY OF FORMATION OF PHASE MANIPULATED SIGNALS BY HYDROACOUSTIC PARAMETRICAL ANTENNA
Authors A. E. Anishchenko, G. V. Soldatov, A. V. Lotarev, A. Y. Varenikova
Section SECTION I. METHODS AND MEANS OF ACOUSTIC MONITORING
Month, Year 06, 2018 @en
Index UDC 534.2
DOI
Abstract Owing to technical progress in development of sea infrastructure the need of information transfer through the water environment on tens and hundreds of thousands of meters appears. Objective of this research is the development of the new principle of phase manipulation for sound underwater connection with use of the parametrical antenna. The basic possibility of use of intercarrier frequency of the parametrical hydroacoustic antenna for forming of signals with phase manipulation is shown. Two ways of forming of phase manipulation are the following: by means of phase change of pumping rates and by means of impermanent update of frequency on section of a differential wave are considered. Use of the existing way of phase manipulation through change of phases of signals of pumping leads to uncontrollable transition processes in a signal of intercarrier frequency. Use of the second way of phase manipulation of a signal of intercarrier frequency through impermanent update of pumping rates and respectively emergence of the changed section of the signal of intercarrier frequency shifting a phase of a base signal towards reduction or towards increase allows to manage transition process reducing the number of amplitude emissions. Natural experiments both in the control and measuring hydroacoustic pool, and in the sea taking into account existence of natural hydrological conditions the confirmed theoretical provisions are made. Calculations showed that use of the shortened changed part of a signal of intercarrier frequency of the parametrical antenna results in need of excessive increase in pumping rate (hundreds of kHz) that can exceed band width of transmission of the parametrical antenna. Use of the increased section allows increasing frequency slightly (by tens or even units of kHz) that gives almost unlimited opportunities for the choice of an angle of manipulation.

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Keywords Sound underwater communication; phase manipulation; parametrical antenna; digital communication.
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