Stepped-Frequency Radar System in Gating Mode: An Experiment as a New Helicopter-Borne GPR System for Geological Applications. - Dieter Eisenburger; Yvonne Krellmann; Harald Lentz; Gunnar Triltzsch (IGARSS (1), 2008)

A Tomographic Approach for Helicopter-Borne Ground Penetrating Radar Imaging. - Ilaria Catapano; Lorenzo Crocco; Yvonne Krellmann; Gunnar Triltzsch; Francesco Soldovieri (IEEE Geosci. Remote. Sens. Lett., 2012)