Determination of the current velocity by measurements of nautical radar. Abstract

Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2020. No. 1
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Full text in Russian (pdf)
Russian page

DOI 10.30898/1684-1719.2020.1.1

UDC 537.877+532.5.013

DETERMINATION OF the CURRENT VELOCITY BY Measurements OF NAUTICAL RADAR

A. S. Zapevalov ^1,2, I. P. Shumeyko ²

¹ Marine Hydrophysical Institute of RAS, Kapitanskaya str., 2, Sevastopol 299011, Russia

²Sevastopol State University, Universitetskaya str., 33, Sevastopol 299053, Russia

The paper is received on December 16, 2019

Abstract. The analysis of physical factors limiting the accuracy of reconstruction of the field of the current velocity vector by measuring the radio signal scattered by the sea surface is carried out. The analysis is performed for a situation when sounding is carried out by a nautical radar. It is shown that one of the factors limiting the accuracy is the use of space-time characteristics of surface waves. The accuracy is limited by the ambiguity of the relationship between the spectra constructed in the space of wave numbers and frequencies. Ambiguity was found in field experiments in which the characteristics of the sea surface were determined in situ by wave gauges. To calculate the current velocity, it is proposed to use a procedure developed for high-resolution optical images obtained from spacecraft. This procedure is based on cross-spectral analysis of two images of the same area of the sea surface obtained with a small time interval. The current velocity is determined by the deviation of the measured phase velocity from the theoretical value following from the dispersion relation for gravitational waves. It is shown that the characteristics of nautical radars allow the use of this procedure for determining the current velocity.

Key words: sea surface waves, radio waves, current velocity, nautical radar, accuracy of remote measurements.

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For citation:

Zapevalov A.S., Shumeyko I.P. Determination of the current velocity by measurements of nautical radar. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No. 1. Available at http://jre.cplire.ru/jre/jan20/1/text.pdf. DOI 10.30898/1684-1719.2020.1.1