Radar Cross Section (RCS) is the "gauge" of how visible an object is to a radar system, representing a comparison between the signal strength hitting a target and the echo reflected back. In his seminal work, Radar Cross Section
Many of his early technical reports for the Department of Defense are hosted here for public access.
The radar cross section (RCS) is a measure of how much electromagnetic radiation is scattered back to the radar receiver by a target. It's a fundamental concept in radar engineering, as it determines the detectability of a target by a radar system. RCS is typically denoted by the symbol σ (sigma) and is measured in square meters (m²).