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Ground reflections and the ATS-6 radio beacon experiment
Affiliation:1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China;2. PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, PR China;3. CNPC Engineering Technology R & D Company Limited, Beijing 102206, PR China;4. CNPC Xibu Drilling Engineering Company Limited, Karamay, Xinjiang 830011, PR China;1. Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan;2. Department of Emergency Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan;3. Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan;1. Arctic Research Centre, Aarhus University, Aarhus C, Denmark;2. VLIZ - Flanders Marine Institute (VLIZ), Oostende, Flamish Region, Belgium;3. MG Solar, Frederiksborgvej 399, Roskilde, Denmark;4. Aarhus Institute of Advanced Studies, Aarhus University, Aarhus C, Denmark;5. Mopa Patrol Både, Møllevej 21, Vilsund, Denmark;6. Department of Biology, Aarhus University, Denmark;7. Department of Mechanical and Production Engineering, Aarhus University, Denmark;8. Department of Environmental Science, Aarhus University, Denmark;9. Department of Ecoscience, Aarhus University, Denmark;10. Department of Physical Geography and Ecosystem Science, Lund University, Sweden;11. Centre for Earth Observation Science, University of Manitoba, Canada;12. Greenland Institute of Natural Resources, Greenland;13. Oulanka Research Station, Oulu University, Finland;14. Department of Electrical and Computer Engineering, Aarhus University, Denmark
Abstract:Small amplitude quasi-periodic variations of short period have been a feature of the modulation phase and carrier signal strength recordings of transmissions from the ATS-6 satellite received at Aberystwyth. The observations can be accounted for as effects of reflections from topographic features in the satellite azimuth direction. A similar explanation has been invoked to interpret the form of the modulation phase variation during a satellite rotation calibration test. Ground reflection effects can limit the accuracy of ionospheric measurements using the ATS-6 radio beacon and observers are urged to consider the implication of such perturbations on the precision of their measurements.
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