1. Institute of Bio-and Geosciences: Agrosphere (IBG-3),Forschungszentrum Jülich,Jülich,Germany
2. Institute for Electromagnetic Sensing of the Environment (IREA),National Research Council of Italy (CNR),UOS Bari,Italy
3. Microwaves and Radar Institute (HR),German Aerospace Center (DLR),Wessling,Germany