An Interferometric Approach to Radar Doppler Analysis: Theory and Results

Analysis of radar backscattering of moving objects is typically performed with spectral analysis, to isolate signal located at different Doppler frequencies. This approach applies in the hypotheses that, during the observation time, the target moves with uniform radial velocity and its range changes by several wavelengths. This hypothesis is not always verified, e.g. for physiological internal movements when observed at low frequencies. This paper presents a theoretical model to represent the radar backscattering of a moving object with special emphasis on sub-wavelength motion. Furthermore, matching of the model with experimental data is discussed.