A simple expression for estimating attenuation by fog at millimeter wavelengths
Abstract
An expression is presented for calculating normalized fog attenuation of mm-wavelength signals as a function of wavelength and fog temperature using regression analysis. The analysis was constrained to wavelengths between 3 mm - 3 cm and temperatures from -8 to 25 C. An expression with a squared correlation coefficient of 0.9983 was found and accepted as reliable in the intervals considered. It is noted that visibility in a fog is not a good indicator of fog density, especially because of the existence of radiation fogs which may form at night as air becomes supersaturated over cold ground. A relationship is, however, defined between fog density and visibility.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- July 1984
- DOI:
- 10.1109/TAP.1984.1143395
- Bibcode:
- 1984ITAP...32..757A
- Keywords:
-
- Atmospheric Attenuation;
- Fog;
- Meteorological Parameters;
- Microwave Attenuation;
- Millimeter Waves;
- Particle Density (Concentration);
- Regression Analysis;
- Temperature Effects;
- Wavelengths;
- Communications and Radar