The upwind/downwind dependence of the doppler spectra of radar sea echo

A detailed investigation of the differences between the upwind and downwind Doppler spectra of the radar sea echo has been made, utilizing
P-
,
L-
, and
C
-band data obtained with the Naval Research Laboratory's Four-Frequency Radar System. The results indicate that while the Doppler bandwidth is nearly independent of wind direction, the differential Doppler looking upwind is nearly twice that for the downwind case.