Direct Detection and Location of Multiple Sources with Intermittent Emission.
Marc Oispuu · GI-Jahrestagung · 2009
Abstract: This paper investigates the direct position determination (DPD) problem from passive measurements made with a moving antenna array in the case of a timevarying number of emitting sources. We derive the Cramer-Rao Bound (CRB) for the estimation problem and find an approximation that is applicable for a large number of observations. We use two DPD approaches to solve the estimation problem based on the Capon method and on the deterministic Maximum Likelihood (ML) estimator using a lowand high-dimensional optimization, respectively. The ML-DPD approach offers a superior performance compared to the Capon-DPD approach, but leads to a high-dimensional optimization. We use the Alternating Projection technique to solve the high-dimensional optimization by a sequence of low-dimensional optimizations. We propose an iterative approach that combines the source location and the determination of the total number of sources (referred as detection). We use a sequence of statistical tests to decide that the choice of the source number is correct. We present simulation results that demonstrate the performance of the method.