Analysis of the PM and AM associated with the natural eigenfrequencies of spinning metallic and dielectric cylinders illuminated at high frequencies

Doppler spectra from broadside 77 GHz plane wave radar illuminated dielectric and metallic cylinders are investigated under static and dynamic target conditions. The classical formulae of modulation theory are reviewed and verified empirically using measured data containing AM and PM components manifested as discrete sideband imbalances. Particular emphasis is placed on the phasor representation of the Doppler and on the practical understanding of the intrinsic AM/PM ambiguities. Techniques used in the analysis could be applicable to the problem of AM and PM conversion in oscillators and sources. In particular ambiguities are represented and bound using a vector in a box approach.