Simulation of the Doppler signals at 24 GHz from a walking person

For the simulation of the Doppler signals the geometry of a walking person is determined for discretized time steps fulfilling the Nyquist theorem. For each time step a field simulation with the physical optics (PO) and the geometrical optics (GO) approximation is done. Both approaches are based on a neglect of multiple reflections on the scattering object. After simulation the time varying field is displayed in time-frequency domain. For the PO-approximation only the total scattered field can be evaluated. With GO-approximation the path for different scattering points can be extracted and evaluated individually. Although both approaches give comparable results, the extraction of scattering centers gives a much better insight to the physical phenomena of scattering in the high frequency case.