Inverse Scattering at Low Frequencies-Diameter Estimation

The well-known relationship between the radar cross section and the volume of the target for Rayleigh scattering situations is extended to permit the direct estimation of the target's diameter for a variety of shapes. It is concluded that for objects of length-to-diameter ratios between one and five and for aspects within 300 of "nose-on" the diameter should be determinable to within at least 50 percent if the frequency is selected in the Rayleigh region for the target being observed.