Point-Scatterer Formulation of Terrain Clutter Statistics
NAVAL RESEARCH LAB WASHINGTON DC
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The first-order statistics of terrain clutter are investigated theoretically and experimentally. The return from a point-scatterer a scintillating signal is used as a basis for generating the statistical properties of terrain clutter as observed by side-looking airborne radars. According to the model the limiting distribution of terrain clutter are the Gaussian distribution and the distribution for a scintillating signal specular clutter. An array of point-scatterers within the radar beam produces clutter which has long tails similar to those of a lognormal distribution. The convergence of the first-order statistics of a scintillating signal to the statistics of a sinusoidal signal is demonstrated. Also, the statistics of terrain clutter are inferred from data taken with the Naval Research Laboratorys Four Frequency Radar System by the Kolmogorov--Smirnov test of the cumulative distribution and by the computation of the first five central moments of the normalized radar cross section of terrain in decibels.
- Active and Passive Radar Detection and Equipment