RADIO PHYSICS AND RADIO ASTRONOMY

Subject and Purpose. Without regard to successes attained in the field of monitoring of territorial formations frontier areas and environment the problem of territorial waters guard and control of economic zone is as well as before actual for many states, that have the prolonged marine boundary. The aim of researches is an improvement of method of ecologically safe exposure of surface objects beyond the radiohorizon and development of ecologically safe meter wavelength radar for the guard of territorial waters with the use of active floating radio buoy.

Methods and Methodology. Taking into account ecological requirements to the radiotechnical equipment and feature of beyond the horizon radio wave propagation the bistatic radar for surface objects exposure beyond the radiohorizon was proposed. One of the system features is the use of active radio buoy located on considerable distance from a shoreline. To estimate the system operationthe methods of analysis and numerical modelling are used.

Results. Having conducted the analysis of basic mechanisms of radio wave propagation beyond the radiohorizon and existed experimental data, the necessary power features of proposed meter wavelength bistatic radar is calculated. For practical realization of this system the algorithms for finding the distance to the surface object and its speed are brought in details. The functional diagrams for both coastal and radio buoy receivers are worked out. Detailed description of their operation is given.

Conclusion. The ecologically safe impulsively-coherent radar system is proposed, its transmission device is set on radio buoy beyond the radiohorizon, The radar true coherence is obtained due to the use of continuous signal of driving generator transmitter, that is irradiated in a period between sounding impulses and after a reception and treatment in the receiver serves as a reference signal, the coherenceinterval exceeds the period of pulse-repetition considerably. The use of speed difference of surface objects to be located and wind waves that create radar clutter will allow to carry out the radar exposure of surface objects on a background of
marine surface clutter.

Keywords: Beyond the horizon radar; radiobuoy; bistatic radar; phase array

Manuscript submitted  11.07.2023

Radio phys. radio astron. 2023, 28(4): 295-303

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