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电信和无线电工程
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN 打印: 0040-2508
ISSN 在线: 1943-6009

卷:
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电信和无线电工程

DOI: 10.1615/TelecomRadEng.v73.i5.30
pages 399-411

DISTINCTIVE FEATURES OF FORMING THE SPACE-TIME MILLIMETER RADIO-WAVE FIELD AT LOW ALTITUDES ABOVE THE SEA SURFACE

V. B. Razskazovsky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
Yu. F. Logvinov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine

ABSTRACT

An impact of the sea surface condition upon the space-time structure of the e.m. field propagation over the above surface causes the range of shipboard radars to suffer certain limitations, thereby impairing an accuracy in measuring the angular coordinates of objects. On account of strong shadowings one can observe an interaction between the illuminating field and the sea waves only. In this context the computational procedures are currently in the initial stage of elaboration. They are aimed at calculating the effects produced during the operation over the millimeter and submillimeter range at angular heights of objects being observed. The parameters of elements interacting with the illuminating e.m. field have been evaluated by means of simulating the sea surface form. The basic physical reradiating mechanisms are determined and the selection of calculated dependences is substantiated. These dependences allowed estimating the path length distribution of coherent and noncoherent intensities of the reradiated field component and its angular spectra at a point of arrival. A special approach to representing the sea surface-reradiated field has been developed. It provides an adequate insight into the previously determined features of the signal amplitude fluctuation spectra of millimeter waves in the over-sea propagation. Thus, the procedure for computing the millimeter and centimeter-wave field over the sea surface has been theoretically grounded. It has likewise been tested via solutions of radiophysical problems at strong shadowings of certain sea surface areas.


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