Jc. West, THE EFFECT OF RANGE-TO-VELOCITY RATIO ON SIMULATED SAR IMAGES OF OCEAN WIND-WAVES, IEEE transactions on geoscience and remote sensing, 31(1), 1993, pp. 299-303
Synthetic-aperture-radar (SAR) imaging of locally wind-generated ocean
waves is simulated using the subwindowing technique. Several SAR rang
e-to-velocity ratios (R/V) are used. Coherence is maintained throughou
t the imaging process, so the final image spectra include the noise re
sulting from phase-interference fading. Maximum spectral signal-to-noi
se ratio (SNR) is achieved with an R/V that maximizes velocity bunchin
g modulation through imaging nonlinearities. Although the azimuthal sh
ift of the spectral peak can be lessened by utilizing a lower R/V, the
maximum wave number at which the signal exceeds the spectral noise do
es not change significantly, and the resulting decrease in overall S/N
would likely make spectral extraction more difficult.