Comparison between Beam-Forming and Orthogonality Sampling Method

A comparative analysis between the orthogonally sampling method and the beam-forming schemes is presented. In particular, two different versions of the beam-forming are considered: the windowed (i.e. classical approach) and the non-windowed (i.e. non-coherent approach) schemes. By considering, a multiview/multistatic/multifrequency configuration in a 2D geometry, the point spread functions of the different methods are derived. This makes the comparison easier in terms of the achievable resolution and how the configuration parameters affect the performances of the imaging methods. Moreover, the role of the noise and the uncertain antenna frequency response are analyzed. Numerical results confirmed that the non-coherent beam-forming method exhibits the best trade-off between achievable performance and robustness against the noise and antenna uncertainties.