Abstract. The possibilities of determining the
vibration amplitude of marine objects by controlling the nonlinear
transformation of the microwave radio signal reflected from the vibrating
surface are analyzed. It is shown that the signal has such a structure that
allows you to determine the amplitude of vibration according to the ratios of
the amplitudes of the first four harmonics of the reflected radio signal. In the framework of this
method, the vibration amplitude is determined in units of the length of the
probing radio wave. This allows measurements to be taken without any additional
radar calibrations.
The principal
disadvantage of this method is the limitation of the range of measured
vibration amplitudes, which cannot exceed 0.3 times the length of the radio
wave. Ambiguity occurs
at larger values of vibration amplitude. The interaction of radio waves with
the sea surface also reduces the maximum value of the measured vibration
amplitudes. The sea surface is mobile and its contribution to the Doppler radar
spectrum can be significant.
A new approach
to determining the amplitude of vibration is proposed. It is based on two-frequency sensing
of the vibrating surface. It is shown that within the framework of this
approach the range of vibration determination can be extended several times.
The conditions for determining the relationship between the wavelengths that
provide continuity of the range of measured vibration amplitudes are obtained.
The continuity conditions are obtained taking into account the interference
created by the sea surface.
Key words: vibration, remote sensing, harmonics of the reflected signal,
phase modulation index.
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For citation:
V. M. Burdyugov,
I. P. Shumeiko, M. I. Ozhiganova. Measurement of vibration
of sea surface objects by radio sounding. Zhurnal
Radioelektroniki - Journal of Radio Electronics. 2019. No. 1. Available at
http://jre.cplire.ru/jre/jan19/10/text.pdf
DOI 10.30898/1684-1719.2019.1.10