sentences:  Assume that the clutter fills the cell containing the target, that scatterers are statistically independent and that the scatterers are uniformly distributed through the volume.The clutter volume illuminated by a pulse can be calculated from the beam widths and the pulse duration, Figure 1.If "c" is the speed of light and formula_2 is the time duration of the transmitted pulse then the pulse returning from a target is equivalent to a physical extent of "c"formula_2, as is the return from any individual element of the clutter.