Evidence of tilted layers in angle of arrival andDoppler beam steering power measurementsB

The results of an experiment combining Doppler beam steering (DBS) and angle of arrival (AOA) measurements are presented. Non-zero values of vertical beam AOAs and oo-zenith DBS power measurements have been attributed to the action of tilted specular layers by various authors. This study aims to directly compare the two sets of measurements in an eeort to determine whether the action of tilting specular layers can be observed in both vertical beam AOAs and oo-zenith DBS power values. The results of the comparison indicate that the power diierences in beams at 3:6 oo-zenith are related to the AOA on a vertical beam and that the variation of the two quantities is consistent with tilted specular layers being observed in all of these beams. In contrast, the power diierences at 10:8 oo-zenith do not appear to have the same relationship to the AOA values observed on a vertical beam.