Apparent temperatures of smooth and rough terrain
- 1 November 1961
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 9 (6) , 567-572
- https://doi.org/10.1109/TAP.1961.1145062
Abstract
The apparent temperatures of smooth and rough terrain surfaces are calculated for frequencies between 1 and 75 kMc, for angles of incidence between5\degand80\deg, and for observation altitudes between 2 km and 32 km. The attenuation and thermal radiation caused by the atmosphere are accounted for by an experimental model atmosphere, and the surface emissivities are based on measured complex dielectric constants (for the smooth surfaces) and measured radar return (for the rough surfaces). It is found that perpendicular polarization provides the greatest temperature contrast between rough and smooth surfaces, and that the contrast decreases as the altitude of observation increases; atf=75kMc (approximately the resonant frequency of the oxygen molecule), there is likely to be little, if any, contrast between rough and smooth surfaces.Keywords
This publication has 5 references indexed in Scilit:
- Terrain return measurements at X, K>inf/inf<, and K>inf/inf<bandPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Apparent thermal noise temperatures in the microwave regionIEEE Transactions on Antennas and Propagation, 1960
- Interaction of electromagnetic waves with some natural surfacesIEEE Transactions on Antennas and Propagation, 1959
- Effective Antenna Temperatures Due to Oxygen and Water Vapor in the AtmosphereJournal of Applied Physics, 1959
- Apparent Temperatures of Some Terrestrial Materials and the Sun at 4.3-Millimeter WavelengthsJournal of Applied Physics, 1958