Multi-resolution multi-frequency analysis of high range resolution sea reflections

A description of the surface by a K distribution is of particular interest in that the K distribution can be decomposed into a Rayleigh distributed fast fluctuating amplitude component modulated by a chi distributed slow fluctuating amplitude component. Thus if the observed data can be described by a K distribution the components of the return can be analysed separately and related to physical aspects of the sea surface. The slow correlation characteristics of the backscatter can then be included in target detection strategies and radar performance calculations. Failure to allow for the correlation characteristics can lead to large errors in radar detection performance and radar false alarm rate. Agreement with a K distribution model has been demonstrated for a limited range of radar parameters. The K model has been shown to be valid at I Band and resolutions down to 4 m. The author describes measurements and analyses performed at the Marconi Research Centre to extend the observations to higher resolutions and a range of frequencies