Abstract
Theoretical predictions, as well as observations at relatively short ranges and steep grazing angles, show that a sound wave which is forward scattered from the ocean surface has its frequency components smeared by surface-wave motion [M.V. Brown and G.V. Fisk, J. Acoust. Soc. Am. 55, 744–749 (1974)]. The subject of this paper is the presence of observable sidebands in CW signals which are generated by a moving source received at ranges of up to 160 NM in the ocean. The sidebands are approximately 0.1 Hz from the (Doppler-shifted) source center frequency and are as strong as 15 dB below the level of the signal received at the source frequency. [Work supported by Office of Naval Research.]
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