In urban sensing and through-the-wall radar, the existence of targets in proximity to walls or buildings results in multipath returns. In this paper, we exploit the multipath from the walls to achieve target localization with a single sensor. We deal with sparse scenes of single targets. A time-of-arrival wall association algorithm is derived to relate target multipath returns to the respective walls, followed by a nonlinear least squares optimization to determine the target location. Simulated and experimental data are used to validate the proposed algorithms.
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