KA-BAND SCINTILLATIONS - MEASUREMENTS AND MODEL PREDICTIONS

New propagation data from a 30/20-GHz propagation experiment at severa l U.S. sites, including Fairbanks, AK, and Norman, OK, are presented t o examine existing models for scintillations. Beacon measurements were collected at one sample per second continuously and at 20 samples per second for selected intervals. The widely separated measurement frequ encies and the wide range of measurement elevation angles of about 8-5 2 degrees provide a solid set of measurements to test existing models and formulate new ones. It is found that current scintillation predict ion models overestimate the magnitude of scintillation. The Karasawa m odel was modified to fit the Fairbanks data, with this modification va lid for the climate zone containing Fairbanks. The model of the radioc ommunication sector of the International Telecommunication Union was e xamined for several sites, and an elevation angle modification was att empted to bring it into agreement with the data sets. Measurements ind icate a frequency dependence of f(7/12).