4 October 1999 Time-frequency distributions of radar returns from sea surface in x- and Ka-band
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The results of the experimental investigations concerning the spectral and polarization characteristics of Doppler radar water surface echo in X- and Ka radiowave bands are represented. Both the sea radar returns and shallow basin radar returns are being considered. The main attention is devoted to research the time-frequency distributions of such signals for the purpose of identification of different states of nonstationarity of radar sea echo for example the state of 'spikes' and 'pauses'. The high order spectral estimation is employed to obtain the trajectories of spectral components for research the dynamical characteristics of Doppler spectra. The two-dimensional auto-correlation function of such trajectories give opportunity to obtain the distinctive structure the properties of which can be made use for above mentioned identification. To research the dynamic properties of separate spectral lines in time-frequency distributions the signal processing algorithm, making possible to reveal the distinctive trajectories for estimation of their basic attributes is made use. The revealing of trajectory is fulfilled with use of the neural network algorithm.
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Vladimir Kirichenko, Vladimir Kirichenko, Vladimir G. Sugak, Vladimir G. Sugak, } "Time-frequency distributions of radar returns from sea surface in x- and Ka-band", Proc. SPIE 3809, Signal and Data Processing of Small Targets 1999, (4 October 1999); doi: 10.1117/12.364055; https://doi.org/10.1117/12.364055

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