Topic summary
Normalized radar cross section
Extracted from the Wikipedia article Radar cross section.
In some cases, it is of interest to look at an area on the ground that includes many objects. In those situations, it is useful to use a related quantity called the normalized radar cross section (NRCS), also known as differential scattering coefficient or radar backscatter coefficient, denoted σ or σ0 ("sigma nought"), which is the average radar cross section of a set of objects per unit area: