Accession Number:

ADA610427

Title:

Radiometric Measurements of Slant Path Attenuation in the V/W Bands

Descriptive Note:

Interim rept. Aug 2012-Apr 2014

Corporate Author:

AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE

Report Date:

2014-09-01

Pagination or Media Count:

9.0

Abstract:

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.

Subject Categories:

  • Thermodynamics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE