Use of Zero Counting for Estimating the Zero-Frequency Spectral Density of Radar Glint for Known Target Types

Some simple formulas of Blachman giving the zero-frequency spectral density of phase rate for narrowband Gaussian random noise in terms of the latter´s spectral radius of gyration are used to derive the zero-frequency spectral density of radar glint for a complex target in terms of the radius of gyration of the collection of radar scatterers and the rate of zero crossings of the target echo.