RCS prediction from scattering matrix measurements

The radar cross-section measurement equipment described in this paper was designed as a research tool for use in radar discrimination studies. Measurements of the radar scattering matrix made for various bodies were then used to predict the radar cross section of the body for any arbitrary polarization. All measurements were made at X-band with both metal and dielectric covered models scaled to simulate radar returns at UHF and L-band frequencies. A unique closed loop measurement system was employed to measure amplitude and relative phase to considerably greater accuracy than usual. The results show clearly that it is possible to use the radar scattering matrix to predict accurately the return from a body at any polarization.