Accession Number : AD0268083

Title :   EXPERIMENTS ON BACKSCATTER OF H.F. RADIOWAVES FROM OPEN AND COASTAL SEA

Corporate Author : CENTRO RADIOELETTRICO SPERIMENTALE G MARCONI (ITALY)

Personal Author(s) : RANZI,I.

Report Date : 01 MAR 1961

Pagination or Media Count : 1

Abstract : By means of a phase device, it was possible to ascertain that the echoes, due to the backscatter of vertically polarized HF radiowaves from open sea, show a doppler frequency shift, which closely agrees with the one calculated on the ground of the velocity of the sea waves having a length lambda/2. An apparent voltage reflection coefficient of the sea waves is defined; its maximum observed values on 4 and on 28 mc are of the same order of magnitude; with a calm sea, this coefficient is more than ten-fold greater on 28 mc than on 4 mc. The sea echo intensity, on 28 mc, lowers by about 26 db, while changing from vertical to horizontal polarization. Finally, it became evident that strong backscatter was due to the sea waves near a coastal boundary. (Author)

Descriptors :   HIGH FREQUENCY, LAKES, OCEAN WAVES, OCEANS, POLARIZATION, RADIO WAVES, REFLECTION, SCATTERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE