Further analysis of the modulation of high frequency radar spectra due to sea-induced antenna platform motion

The scattering of high frequency electromagnetic waves from the ocean surface is considered for the case of the radiation source being a vertical pulsed antenna mounted on a floating platform while the receiving antenna is fixed on the shore. This represents a small extension to an earlier analysis by Walsh in which both the transmitting (TX) and receiving (RX) antennas were co-located on a floating platform and the effect of the sway was accounted for in the ocean cross section. It is known that additional features appear in the Doppler spectrum when the RX and TX antennas are permitted to sway slowly, and here a similar result is shown when only the TX antenna moves. It is seen in this case that the magnitude of the additional spectral features is reduced as compared to the case when both antennas are moving. As a motivation for continuing analytical work, a preliminary field result is depicted.