1. Department of Space Research and Technology, Technical University of Denmark, Building 328 Elektrovej, 2800 Kongens Lyngby, Denmark
2. Department of Electronic and Electrical Engineering, University of Bath, Bath BA1 7AY, UK
3. AJ Geomatics, 4000 Roskilde, Denmark
4. Peak Wind, Mikkel Bryggers Gade 4, 1460 Copenhagen, Denmark
5. Athena Space Limited, Torquay TQ2 7TD, UK