Abstract
The ability of a 3.3-mm radiometer to produce thermal images with a 10 arc-minutes resolution on a real-time display has been proved. The influence of the terrain and of the atmosphere on a picture taken from a ground-based antenna has been investigated. The range of zenith sky noise temperatures measured (40–240 degrees K) is so large that a well recognizable object at low sky noise temperature (object on a natural terrain) may disappear completely for a heavy cloud cover. It is shown that the uniquely high angular resolution of this microwave radiometer permits the display of thermograms which approach the visual impression of optical images even under Fresnel conditions.
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