Gianluca Zampieri, Shrivathsan Narayanan, Omar Garcia Crespillo and Okuary Osechas, German Aerospace Center, (DLR), Germany

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In the current remodernisation of the Air Traffic Management, APNT systems based on terrestrial navigation aids are conceived as backup solutions in case of a GNSS outage. In this paper, we address the widely acknowledged problem of degraded geometries in terrestrial ranging systems for aviation. We analyze the impact degraded geometries have on the ill-posedness of the positioning algorithm by means of the condition number. Finally, we propose an approach based on a regularized least squares estimator suitably designed for these specific conditions.