DOI: 10.14489/td.2015.03.pp.026-029

Lukashkin V.G.
WAVE SEISMOHYDROACOUSTIC ANTENNA
(pp. 26-29)

Abstract. The article considers the problems of control and detection of geophysical disturbances in fluctuating environments (hydrosphere, at-mosphere) by the phase method using spatially separated wave generator. The main units of the generator are hydroacoustic channel with length of about 100…150 m and narrowband positive feedback radio, connected in a closed circular active system. Under the conditions of self-excitation (amplitude balance and phase balance), this closed system is excited at a frequency of narrowband radio crystal filter with the resonant frequency of 10 kHz, which is connected to the output of the detector radio receiver. Generated signal of 10 kHz is emitted by the acoustic transmitter to the hydroacoustic channel. At the receiving end of the emitted signal is amplified with an acoustic receiver and modulates a carrier with the frequency of 30 MHz channel feedback radio. The received AM signal closes the contour of the circular spatial generation system, wherein any geophysical disturbances modify the spatial autogeneration conditions and provide a measurement or data signal. As this data signal detection system of perturbations (antenna) the phase difference at the output of the two-channels phasemeter between the emitted and the received signals of the hydroacoustic channel is used.

Keywords: acoustic signal, antenna, excitation, modulation, monitoring, detector, band-pass filter, radio-signal, phase fluctuations, phase meter.