Patent RU-2659105-C1 (RU)
Title: Large-scale radiohydroacoustic system of monitoring, recognizing and classifying fields generated by sources in marine environment
Inventor: Pyatakovich Valerij Aleksandrovich
IPC: G01H3/00
Filed: 2017-06-05
Granted: 2018-06-28
Abstract: FIELD: physics. 
     SUBSTANCE: invention relates to hydrophysics, geophysics and radiophysics. Large-scale radio-hydroacoustic system includes the main luminal parametric system for monitoring, recognizing and classifying fields generated by sources in the marine environment, which contains underwater radiators and receiving blocks connected by a cable to the radiating and receiving paths of the system, respectively, formed in the marine environment between the radiating and receiving transducers, the working zones of nonlinear interaction and parametric transformation of the luminous and measurable information source waves. Radiation path of the system includes a serially connected signal generator of a stabilized frequency in the range of tens to hundreds of hertz, the power amplifier of the signals and the unit for coordinating its output with the underwater emitters of the luminescent signals. Receiving path contains a switch of analysis lines of received broadband signals, three correlation lines and one spectral analysis line, as well as an analysis block of the information allocated by all the lines. Working zones of nonlinear interaction and parametric conversion of luminous and measurable information waves are formed in the vertical plane of the controlled medium as multi-beam spatially-developed parametric antennas. Main luminous parametric system is formed as a complex of vertical multi-beam parametric antennas located along the circumference or perimeter of the surveyed area of the water area through 45° and oriented from the radiating center to the periphery. Distances between the acoustic transducers of the receiving blocks are set in accordance with the correlation characteristics of the vertical structure of the acoustic field. Proposed system is fundamentally different in that a large-scale radio-hydroacoustic system is formed within an extended water area, for which the main luminous parametric system is located in the center of the controlled area of the water area, and additional subsystems, introduced into the large-scale radio-acoustic system, are located on the given sections of the water area. Main system and additional subsystems are united by a common radiating path, but are equipped with different receiving paths with their underwater radiators and receiving blocks. Structure of all receiving paths introduced lines of neural network analysis to automatically determine the degree of belonging of the investigated spectral region to the classification object, including a serially connected managed switch, a neural network recognition and classification unit, a cumulative analysis unit. Results of analytical processing via communication channels are transferred to the Single Information and Analytical Center, which was introduced into the large-scale radio-acoustic system, to recognize and classify the sources of the formation of fields of different physical nature in the marine environment, and to generate signals (commands) for controlling the operation of the scalable system. Additional subsystems are formed as complexes of vertical multi-beam parametric antennas located in a circle or perimeter of the monitored water area through 45° and oriented from the center to the periphery. Additional subsystems are removed from neighboring subsystems at a distance, providing monitoring of the extended water area. System monitors extensive water areas. Frequency range of the measured information waves is hundreds to tens of units-fractions of the hertz, including the waves of VLF oscillations of moving objects and the inhomogeneities of the medium, as a whole. Operations of recognition and classification of sources of formation in the marine environment of information fields are performed on the basis of fuzzy logic of artificial neural networks both in the automatic mode and with the participation of the operator. 
     EFFECT: distant parametric reception of waves of various physical nature (acoustic, electromagnetic and hydrodynamic), formed by natural and artificial sources of the atmosphere, the ocean and the earth's crust, is provided. 
     3 cl, 17 dwg