1. Key Laboratory for Information Science of Electromagnetic Waves (MoE) Fudan University Shanghai China
2. School of Information Science and Technology Fudan University Shanghai China
3. China Research Institute of Radiowave Propagation Qingdao China
4. EISCAT Scientific Association Ramfjordmoen Norway
5. UiT The Arctic University of Norway Tromsø Norway
6. EISCAT Scientific Association Kiruna Sweden