Fig. 9

Schematic representation of the SA experimental arrangement (after MacKinnon et al. 2002). In this figure, the scattering irregularities are moving at velocity v at a particular height, and the ground diffraction pattern is produced by the radar return from these irregularities. The ground diffraction pattern from a particular height moves across the ground with a velocity 2v, and this is sampled at three locations indicated by the green squares. In this example, which is for a VHF boundary layer radar, three groups of nine antennas are used for reception. This increases the gain and also introduces a high frequency filter on the diffraction pattern