(Invoking related search terms for further research.)
That PDF became the architectural DNA of the F-117 Nighthawk. When the first prototype, “Have Blue,” flew in 1977, ground radar operators lost it at eight miles. They had to call the pilot and say, “Sir, our screen says you’ve crashed.” The pilot laughed. “I’m right above you.” radar cross section eugene f knott pdf better
Radar cross section (RCS) is a measure of the amount of radar signal that is reflected back to the radar receiver from a target. It is a function of the target's shape, size, material, and orientation with respect to the radar. RCS is typically denoted by the symbol σ (sigma) and is measured in square meters (m²). A higher RCS indicates that a target is more detectable by radar, while a lower RCS indicates that a target is less detectable. (Invoking related search terms for further research
At its core, RCS is a comparison of two signal strengths: the radar beam sweeping over a target and the reflected echo that returns to the receiver. While it is often measured in units of area, it is rarely the same as the target's physical size. Instead, it is a "fictitious area"—the size of a perfectly conducting sphere that would produce the same echo strength as the actual target. Key Pillars of Knott’s Methodology “I’m right above you
Radar Cross Section Measurements - Eugene F. Knott - Google Books