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Stepped-Frequency CW RCS measurement in Semi-Anechoic Chamber

This paper presents the implementation of a broadband Radar Cross-Section (RCS) measurement system in a Semi-Anechoic Chamber (SAC) of Directed Energy Research Center, where fully anechoic conditions are unavailable, and consequently, spurious reflections are significant. A metallic trihedral corner reflector of 30 cm sides is used as a target, and background subtraction is performed to minimize noise influence in the measurement. A single target reference approach is performed using a sphere as the reference target, and its scattering response is shortly described. A time-domain gating algorithm is then implemented to remove the unwanted reflections and obtain the isolated response of the target. The measurements are performed in the X band as a function of the viewing angle for vertical transmit and receive polarization. The results are compared to numerical simulation using the Integral Solver (I-Solver) of CST.