Initial results from the VPI&SU SIRIO diversity experiment


  • G. C. Towner,

  • R. E. Marshall,

  • W. L. Stutzman,

  • C. W. Bostian,

  • T. Pratt,

  • E. A. Manus,

  • P. H. Wiley


The first year of observations of precipitation effects on the 11.6-GHz beacon signal from the SIRIO satellite are reported. This experiment is unique in that it uses dual-polarized receivers in a diversity configuration (two sites separated by 7.3 km) and a low path elevation angle (10.7°). Rain rate, attenuation, and isolation statistics are presented for both sites. In addition, attenuation diversity gain is plotted and compared to current models. Isolation diversity gain is also discussed. It was found that little improvement in dual-channel isolation is obtained with site diversity at this low elevation angle. The influence of ice clouds was noted in the months of October and November.