Radio occultation data analysis by the radioholographic method |
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| Institution: | 1. German Aerospace Center/German Remote Sensing Data Center (DLR/DFD), Kalkhorstweg 53, 17235, Neustrelitz, Germany;2. Institute of Radio Engineering and Electronics of Russian Academy of Sciences (IRE RAS), 1 Vvedenskogo Sq., Fryazino, 141120, Russia;3. Centre d’Etude des Environnements Terrestre et Planétaires (CETP), 10–12 Avenue de l’europe, bat. Mermoz, 78140, Velizy, France;1. Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore-453552, India;2. School of Computer Science and Engineering, Nanyang Technological University, Singapore-639798, Singapore;1. Institut Pierre Simon Laplace, Laboratoire de Météorologie Dynamique, CNRS, Ecole Polytechnique, France;2. Ecole Nationale Supérieure de Techniques Avancées, Paris-Saclay, France;3. Institut Préparatoire aux Etudes d’Ingénieurs, Université de Tunis, Tunisia;4. Centre National de Recherches Météorologiques Météo France, France;5. Institut national de la météorologie de Tunisie, Tunisia;1. IMAGES_ESPACE-DEV, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan, France;2. ESPACE-DEV UMR UG UA UM IRD, Maison de la télédétection, 500 Rue Jean-François Breton, 34093 Montpellier Cedex 5, France;3. CEFREM, CNRS, UMR 5110, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan, France;4. Scottish Association for Marine Science, Scottish Marine Institute, Oban, UK;5. MIO, CNRS UMR 7294 – IRD 235, Université Aix-Marseille, 163 Avenue de Luminy Bat. Oceanomed 1 Pacific (26P043), 13288 Marseille Cedex 09, France |
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| Abstract: | The radioholographic method is briefly described and tested by using data of 4 radio occultation events observed by the GPS/MET experiment on 9 February 1997. The central point of the radioholographic method (Pavelyev, 1998) is the generation of a radiohologram along the LEO satellite trajectory which allows the calculation of angular spectra of the received GPS radio wave field at the LEO satellite. These spectra are promising in view of detection, analysis and reduction of multipath/diffraction effects, study of atmospheric irregularities and estimation of bending angle error. Initial analysis of angular spectra calculated by the multiple signal classification (MUSIC) method gives evidence that considerable multibeam propagation occurs at ray perigee heights below 20 km and at heights around 80–120 km for the 4 GPS/MET occultation events. Temperature profiles obtained by our analysis (radioholographic method, Abel inversion) are compared with those of the traditional retrieval by the UCAR GPS/MET team (bending angle from slope of phase front, Abel inversion). In 3 of 4 cases we found good agreement (standard deviation σT～1.5°K between both retrievals at heights 0–30 km). |
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