PHANTOM RADAR TARGETS AT MILLIMETER RADIO WAVELENGTHS

摘要

This report describes the techniques and the measured radar returns from "phantom targets" using 8. 6 and 4. 3 millimeter radars. The radar returns are compared to the measured back-scattering cross sections of water drops, insects, steam and other materials at 8.6 millimeter wavelength as measured by a c. w. radar at this wavelength.nWithin the limits of the conditions used in the laboratory, it was impossible to produce returns from synthesized refractive index gradients of sufficient magni¬tude to account for those noted on the radar. It is, there¬fore, concluded that for the millimeter wavelengths and the short ranges considered, the observed phantom returns were due to solid or liquid particles in the atmosphere.