Fig. 1. Terahertz RCS measurement system，note： BS is a beam splitter； M is a gold-coated plane reflector； P1， P2 and P3 are off-axis parabolic mirrors

Fig. 2. Sample pictures（a） Smooth metal ball，（b） Smooth metal cylinder，（c） Smooth metal plate，（d） Smooth metal warhead model

Fig. 3. RCS measurement results of the smooth metal sphere and cylinder calibrators (a) Smooth metal sphere, (b) Smooth metal cylinder

Fig. 4. Measurement results of scattering signal of aluminum alloy plate (a) Direct measurement, (b) Measurement with an attenuator (measured data divided by the attenuation coefficient)

Fig. 5. Measurement of warhead scattering characteristics (a) Scattering signal with sphere calibration, (b) Scattering signal with plate calibration, (c) RCS results of the warhead by combining subsection processed data