“…Rectangular and spherical targets with FSML width defined at the -3 dB level correspond to K ≈ 1, but for more complex targets and/or a lower reference level, K may be between 1 and 4. In practice, a simplified approach could be used [19,28] whereby a target is approximated as a rectangular plate with length L and height H. Hence, the -3 dB level of FSML in azimuth plane will be θ FS,az ≈ λ/L and in elevation θ FS,el ≈ λ/H. A simplified definition can now be made, such that if the FSML is pointing to the radar receiver, the system is referred to as FSR, omitting any conditions on scattering region to provide enhanced RCS.…”