Title :
Experimental study of nonstationary X- and Q-band radar backscattering from the sea surface
Author :
Atanassov, V.B. ; Balan, M.G. ; Haimov, S.J. ; Kulemin, G.P. ; Michalev, M.A. ; Mladenov, L.Hr. ; Pedenko, Yu.A. ; Razskazovsky, V.B. ; Savchenko, A.K. ; Vasilev, V.L.
Author_Institution :
Inst. of Electron., Bulgarian Acad. of Sci., Sofia, Bulgaria
fDate :
4/1/1990 12:00:00 AM
Abstract :
An experimental study of the spectral and polarisation characteristics of microwave radar return from breaking sea is presented. The measurements were made using an X- and Q-band coherent CW radar system. The transmitted electromagnetic wave was either vertically or horizontally polarised but both orthogonal components were received. Measurements were made from a platform at a grazing angle of 6°. The time evolution of the signal intensity, the instantaneous Doppler frequency and the polarisation ratio are studied. Data processing also includes an estimation of the instantaneous energy auto and cross-spectra, the coherence function of like and cross-polarised components and a regression analysis of the corresponding integral spectral parameters for the regions of high and low intensity (`bursts´ and `pauses´) of the radar return. The spectral and polarisation characteristics of bursts are found to differ significantly from those of pauses. The latter are in agreement with the spectral and polarisation characteristics previously obtained by averaging over long time intervals
Keywords :
backscatter; electromagnetic wave polarisation; oceanography; radar clutter; radar systems; 27 to 40 GHz; 8 to 12 GHz; EHF; EM wave transmission; Q-band radar backscattering; SHF; X-band radar backscattering; breaking sea; coherence function; cross-spectra; energy auto-spectra; grazing angle; horizontal polarisation; instantaneous Doppler frequency; microwave radar return; polarisation characteristics; sea clutter; signal intensity; vertical polarisation;
Journal_Title :
Radar and Signal Processing, IEE Proceedings F
