Analysis of radial orbit errors of ERS-1, and the development of super-tailored gravity models |
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| Institution: | 1. Department of Physics, Faculty of Science, University of Guilan, P.O. Box: 41335-1914, Rasht, Iran;2. High-Temperature Fuel Cell Research Department, Vali-e-Asr University of Rafsanjan, Rafsanjan 1599637111, Iran;3. Department of Physics, Bogazici University, Bebek 34342, Istanbul, Turkey;4. Department of Physics “E. R. Caianiello” and “Interdepartmental center NANOMATES”, University of Salerno, Fisciano 84084, Salerno, Italy;1. Grantham Research Institute on Climate Change and the Environment, London School of Economics and Political Science, London WC2A 2AE, UK;2. Sustainability Research Institute and ESRC Centre for Climate Change Economics and Policy, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;1. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy;2. Research Institute on Terrestrial Ecosystems (IRET) – CNR, Naples, Italy;3. Avantech Group srl, Angri, Italy;4. Department of Advanced Medical and Surgical Sciences, 2nd Division of Neurology, Center for Rare Diseases and InterUniversity Center for Research in Neurosciences, University of Campania Luigi Vanvitelli, Naples, Italy;5. Sbarro Institute for Cancer Research and Molecular Medicine, Center for Biotechnology, Temple University, Philadelphia, PA 19122-6078, USA;6. Chromaleont s.r.l., c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy;7. Faculty of Medicine and Surgery, Saint Camillus International University of Health and Medical Sciences, Rome, Italy;1. Johns Hopkins Applied Physics Laboratory, Laurel, MD, 20723, USA;2. Idaho National Laboratory, Idaho Falls, ID, USA |
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| Abstract: | The altimetry mission of the future ESA remote sensing satellite ERS-1 requires very accurate orbit solutions, of which in particular the radial position component should have an accuracy of approximately 10 cm. This paper presents some investigations into the possibility of reducing the radial position error due to the earth's gravity field, which is by far the largest contributing error source.With a detailed harmonic analysis of the ERS-1 orbit a number of gravity field model terms are identified which produce the major radial orbit perturbations. These dominant terms are adjusted in a least-squares orbit determination and parameter estimation procedure using actual SEASAT laser tracking observations and altimeter height measurements. The initial gravity model is the NASA GEM-L2 model derived from satellite tracking data only, with an emphasis on LAGEOS data. The resulting super-tailored model yields a significantly improved radial accuracy relative to GEM-L2, but fails to reach the accuracy of the SEASAT-tailored model PGS-S4.Finally, the SEASAT altimeter residuals and the residuals of the cross-over differences are analyzed in the frequency domain by applying a special filtering technique which separates the major radial orbit error and geoid error contributions. |
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