Doppler Spectrum of a Rotating Smooth Cylinder

The Doppler spectrum of a rotating smooth cylinder is investigated both theoretically and experimentally. Since the studied object has a smooth surface and is large compared to the wavelength, the physical optics (PO) approximation is used. The integration of the surface currents is computed with a hybrid method which consists of integrating analytically the currents in one dimension using the stationary phase method (SPM), while the currents in the other dimension are integrated numerically. This enables a reduction of the computation time compared to a fully numerical integration. Simulations are compared with measurements.