We present simulation results for the spatial-coherence function of a multimode acoustic signal from a remote source in the horizontal plane of a randomly inhomogeneous oceanic waveguide and the angular response of the phased antenna to such a signal to estimate quantitatively the influence of the basic physical factors of the signal-field formation at the antenna input. The simulation was performed in a wide parameter range on the basis of a sufficiently general heuristic model, according to which the signal is the superposition of a finite number of plane waves with random complex amplitudes. It is shown that the most important factors include the spectrum of the longitudinal wave numbers of the normal waveguide modes, the total number and the spectrum of the intensities of the signal modes, and the mutual correlations of the mode amplitudes. Depending on the type of the wave-number spectrum, the influence of the mode-intensity spectrum turns out to be significantly different, which is indicative of the important role of the deterministic properties of the waveguide in the formation of the coherence function and the coherence scale as well as the related distortions of the antenna response to the signal compared with the case of an unbounded space. The physical interpretation of the results, which allows one to make predictive estimates of the considered characteristics in the presence of a priori information on the above-mentioned factors of the received-signal propagation, is given.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 65, No. 1, pp. 46–64, January 2022. Russian DOI: https://doi.org/10.52452/00213462_2022_65_01_46
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Malekhanov, A.I., Smirnov, A.V. Simulation of Spatial Coherence of a Multimode Signal and Response of a Horizontal Antenna in a Randomly Inhomogeneous Oceanic Waveguide. Radiophys Quantum El 65, 42–58 (2022). https://doi.org/10.1007/s11141-022-10192-1
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DOI: https://doi.org/10.1007/s11141-022-10192-1