Wall clutter mitigation for MIMO radar configurations in urban sensing

Strong front wall returns tend to obscure indoor targets and render through-the-wall target detection difficult and challenging. Among the various techniques proposed for wall clutter mitigation under monostatic radar operation is subspace projection. This technique uses the strength of the wall EM reflections relative to that of the target to separate the wall subspace from the target subspace. In this paper, we present analyses of the subspace projection approach for suppressing wall clutter and preserving indoor targets in multi-input multi-output (MIMO) through-the-wall radar imaging systems. We highlight the similarities and the differences in performance of the subspace technique under MIMO and monostatic configurations. Supporting results based on simulated and experimental data are provided.