Radiometric Measurements of Slant Path Attenuation in the V/W Bands
Interim rept. Aug 2012-Apr 2014
AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
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Slant path brightness temperatures were measured at 72.5 and 82.5 GHz with a multi-channel radiometer. One year of measurements collected at 36 degree elevation angle in Rome, NY were examined in terms of attenuation statistics. A model-based attenuation retrieval algorithm was developed to determine the slant path attenuation cumulative distribution function to over 20 dB of attenuation corresponding to less than 1 exceedance probability. Slant path attenuation was also measured with the radiometer using the sun as a source of radiation. Over 30 dB of attenuation dynamic range was possible with this technique. Sun-beacon measurements were used to test model predictions.
- Radiofrequency Wave Propagation