The changes of variable from spatial frequency (r) into range(R) is done by using the following formulae:
3. Next the decrease of the initial contrast between target and background, due to atmospheric transmission and scattering must be considered and is defined by:
where Co = Initial contrast;
RT = Reflectivity of target;
RB = Reflectivity of background;
4. The respective nominal static ranges are given by the intersections of C(R) and the appropriate functions (see fig 2, 3 and 4).
