Using an X-band radar and a mechanical short wave generator, we measured the dependenceof radar return power on the viscosity of water which was adjusted by changing the watertemperature. From the measurements we drew...Using an X-band radar and a mechanical short wave generator, we measured the dependenceof radar return power on the viscosity of water which was adjusted by changing the watertemperature. From the measurements we drew two inferences: （1） the spectral density of short waterwaves, F, depends strongly on the viscosity of waterF（v）=F<sub>0</sub><sup>m</sup>where is normalized viscosity, and m=-1.72; and （2） the normalized radar cross section, σ<sub>0</sub>（dB）, dependsstrongly on the water temperature△σ<sub>0</sub> （dB）=O.217△TAnalyses indicate that these dependencies can be observed in the field only at low wind conditionsat which the Bragg scattering is a dominant mechanism for producing the radar return signals. Theresults of this study can be used to interpret the sharp variability in radar cross section across a watertemperature front and SAR images of oeeanic phenomena.展开更多
文摘Using an X-band radar and a mechanical short wave generator, we measured the dependenceof radar return power on the viscosity of water which was adjusted by changing the watertemperature. From the measurements we drew two inferences: （1） the spectral density of short waterwaves, F, depends strongly on the viscosity of waterF（v）=F<sub>0</sub><sup>m</sup>where is normalized viscosity, and m=-1.72; and （2） the normalized radar cross section, σ<sub>0</sub>（dB）, dependsstrongly on the water temperature△σ<sub>0</sub> （dB）=O.217△TAnalyses indicate that these dependencies can be observed in the field only at low wind conditionsat which the Bragg scattering is a dominant mechanism for producing the radar return signals. Theresults of this study can be used to interpret the sharp variability in radar cross section across a watertemperature front and SAR images of oeeanic phenomena.
