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Publications
Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
(Co) Author: Michalak, G.
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Jäggi, A.; Montenbruck, O.; Moon, Y.; Wermuth, M.; König, R.; Michalak, G.; Bock, H.; Bodenmann, D. (2012): Inter-agency comparison of TanDEM-X baseline solutions. Advances in Space Research, 50, 2, 260-271.
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Beyerle, G.; Grunwaldt, L.; Heise, S.; Köhler, W.; König, R.; Michalak, G.; Rothacher, M.; Schmidt, T.; Wickert, J.; Tapley, B. D.; Giesinger, B. (2011): First results from the GPS atmosphere sounding experiment TOR aboard the TerraSAR-X satellite. Atmospheric Chemistry and Physics, 11, 13, 6687-6699.
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Wickert, J.; Michalak, G.; Schmidt, T.; Beyerle, G.; Cheng, C. Z.; Healy, S. B.; Heise, S.; Huang, C. Y.; Jakowski, N.; Köhler, W.; Mayer, C.; Offiler, D.; Ozawa, E.; Pavelyev, A. G.; Rothacher, M.; Tapley, B.; Arras, C. (2009): GPS radio occultation: results from CHAMP, GRACE and FORMOSAT-3/COSMIC. Terrestrial Atmospheric and Oceanic Sciences, 20, 1, 35-50.
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Wickert, J.; Beyerle, G.; König, R.; Heise, S.; Grunwaldt, L.; Michalak, G.; Reigber, C.; Schmidt, T. (2005): GPS radio occultation with CHAMP and GRACE: A first look at a new and promising satellite configuration for global atmospheric sounding. Annales Geophysicae, 23, 3, 653-658.
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Michalak, G.; König, R. (2010): Improvements for the CHAMP and GRACE Observation Model. - In: Flechtner, F.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 29-39.
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Michalak, G.; König, R. (2010): Near-Real Time Satellite Orbit Determination for GPS Radio Occultation with CHAMP and GRACE. - In: Flechtner, F.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 443-454.
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Michalak, G.; König, R. (2010): Rapid Science Orbits for CHAMP and GRACE Radio Occultation Data Analysis. - In: Flechtner, F.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 67-77.
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Schmidt, T.; Wickert, J.; Michalak, G. (2010): The operational processing system for GPS radio occultation data from CHAMP and GRACE. - In: Flechtner, F.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 455-460.
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Wickert, J.; Beyerle, G.; Falck, C.; Healy, S. B.; Heise, S.; Köhler, W.; Michalak, G.; Offiler, D.; Pingel, D.; Ramatschi, M.; Rothacher, M.; Schmidt, T. (2010): Global atmospheric data from CHAMP and GRACE-A: Overview and results. - In: Flechtner, F.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 433-441.
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Wickert, J.; Schmidt, T.; Michalak, G.; Heise, S.; Arras, C.; Beyerle, G.; Falck, C.; König, R.; Pingel, D.; Rothacher, M. (2009): GPS Radio Occultation with CHAMP, GRACE-A, SAC-C, TerraSAR-X, and FORMOSAT-3/COSMIC: Brief Review of Results from GFZ. - In: Steiner, A.; Pirscher, B.; Foelsche, U.; Kirchengast, G. (Eds.), New Horizons in Occultation Research : Studies in Atmosphere and Climate, Springer, 3-16.
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Michalak, G.; Wickert, J.; König, R.; Rothacher, M. (2007): Near-real time satellite orbit determination for GPS radio occultation. Observation of the System Earth from Space: Status Seminar, 22.-23. November 2007, Bavarian Academy of Sciencesand Humanities, Munich, Programme & Abstracts, Koordinierungsbüro GEOTECHNOLOGIEN, 23-25.
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Neumayer, K.-H.; Flechtner, F.; König, R.; Michalak, G.; Snopek, K.; Köhler, W. (2007): Optimized Algorithms and Methods for Improved CHAMP and GRACE Gravity Fields. Observations of the System Earth from Space : status seminar, 22 - 23 November 2007, Bavarian Academy of Sciences and Humanities, Munich; Programme & Abstracts, Koordinierungsbüro GEOTECHNOLOGIEN, 12-17.
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Wickert, J.; Beyerle, G.; Falck, C.; Flechtner, F.; Galas, R.; Grunwaldt, L.; Healy, S. B.; Heise, S.; Köhler, W.; König, R.; Massmann, F.-H.; Michalak, G.; Offiler, D.; Pingel, D.; Poli, P.; Ozawa, E.; Rothacher, M.; Schmidt, T.; Tapley, B.; Wergen, W. (2007): Global atmospheric data from CHAMP and GRACE in near-real time. Observations of the System Earth from Space : status seminar, 22 - 23 November 2007, Bavarian Academy of Sciences and Humanities, Munich; Programme & Abstracts, Koordinierungsbüro GEOTECHNOLOGIEN, 36-40.
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König, R.; Michalak, G.; Neumayer, H.-K.; Zhu, S. Y. (2006): Remarks on CHAMP Orbits Products. - In: Flury, J.; Rummel, R.; Reigber, Ch.; Rothacher, M.; Boedecker, G.; Schreiber, U. (Eds.), Observation of the Earth System from Space, Springer, 17-26.
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Wickert, J.; Beyerle, G.; Schmidt, T.; Healy, S. B.; Heise, S.; Michalak, G.; Rothacher, M. (2006): GPS based atmospheric sounding with CHAMP: Results achieved after four years. Proceedings / The 2005 EUMETSAT Meteorological Satellite Conference : Dubrovnik, Croatia, 19 - 23 September 2005, Eumetsat, 39-47.
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Wickert, J.; Schmidt, T.; Beyerle, G.; Michalak, G.; König, R.; Reigber, C.; Heise, S. (2006): GPS radio occultation with CHAMP and GRACE: Recent results. - In: Foelsche, U.; Kirchengast, G.; Steiner, A. (Eds.), Atmosphere and climate : studies by occultation methods, Springer, 3-16.
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König, R.; Michalak, G.; Neumayer, K.-H.; Schmidt, R.; Zhu, S.Y.; Meixner, H.; Reigber, C. (2005): Recent Developments in CHAMP orbit determination at GFZ. - In: Reigber, C.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth observation with CHAMP : Results from Three Years in Orbit, Springer, 65-70.
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König, R.; Michalak, G.; Reigber, C.; Grunwaldt, L. (2005): CHAMP Clock Characterization Revisited. - In: Reigber, C.; Luehr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth observation with CHAMP : results from three years in, Springer, 175-180.
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Neumayer, K.-H.; Michalak, G.; König, R. (2005): On calibrating the CHAMP on-board accelerometer and attitude quaternion processing. - In: Reigber, Ch.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth observation with CHAMP : Results from Three Years in Orbit, Springer, 71-76.
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Wickert, J.; Schmidt, T.; Beyerle, G.; Michalak, G.; König, R.; Kaschenz, J.; Reigber, C. (2005): Atmospheric profiling with CHAMP: Status of the operational data analysis, validation of the recent data products and future prospects. - In: Reigber, C.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth observation with CHAMP : Results from Three Years in Orbit, Springer, 495-500.
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König, R.; Neumayer, K. H.; Michalak, G.; Grunwaldt, L. (2003): CHAMP Clock Error Characterization. - In: Reigber, C.; Lühr, H.; Schwintzer, P. (Eds.), First CHAMP mission results for gravity, magnetic and atmospheric studies, Springer, 32-37.
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Michalak, G.; Baustert, G.; König, R.; Reigber, C. (2003): CHAMP Rapid Science Orbit Determination - Status and Future Prospects. - In: Reigber, C.; Lühr, H.; Schwintzer, P. (Eds.), First CHAMP mission results for gravity, magnetic and atmospheric studies, Springer, 98-103.
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König, D.; Dahle, C.; Michalak, G. (2012): The integrated Approach: Status and Update. Statusseminar Geotechnologien 'Weltraum Phase III' (Potsdam 2012).
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Schmidt, T.; Heise, S.; Michalak, G.; Beyerle, G.; Zus, F.; Wickert, J.; Faber, A.; de la Torre, A.; Alexander, P. (2012): Upper tropospheric and lower stratospheric variability observed with GPS radio occultation data since 2001: Results from CHAMP, GRACE, TerraSAR-X, and FORMOSAT-3/COSMIC. International Radio Occultation Working Group (IROWG) 2nd Workshop (Boulder 2012).
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Wickert, J.; Arras, C.; Bartsch, M.; Beyerle, G.; Bender, M.; Deng, Z.; Dick, G.; Falck, C.; Ge, M.; Gendt, G.; Heise, S.; Michalak, G.; Ramatschi, M.; Schmidt, T.; Semmling, M. (2012): GPS/Galileo Earth Observation at GFZ: Recent activities and results. International Symposium and Summer School on Space Geodesy and Earth System (SGES2012) (Shanghai, China 2012).
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König, D.; Dahle, C.; Michalak, G. (2011): The Integrated Approach: Status and Results. BMBF Statusseminar 2011 - Weltraum Phase III (Stuttgart 2011).
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Wickert, J.; Arras, C.; Bartsch, M.; Beyerle, G.; Bender, M.; Deng, Z.; Dick, G.; Falck, C.; Ge, M.; Gendt, G.; Heise, S.; Michalak, G.; Ramatschi, M.; Schmidt, T.; Semmling, M. (2011): GPS remote sensing: Recent results from GFZ. 25th IUGG General Assembly (Melbourne 2011).
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Wickert, J.; Arras, C.; Beyerle, G.; Falck, C.; Flechtner, F.; Förste, C.; Grunwaldt, L.; Faber [Haser], A.; Heise, S.; Jakowski, N.; Köhler, W.; König, R.; Lühr, H.; Massmann, F.-H.; Meehan, T.; Michalak, G.; Reigber, C.; Schmidt, T.; Zus, F. (2011): In Memoriam CHAMP: The pathfinder for operational GPS radio occultation. 5th FORMOSAT-3 / COSMIC Data Users Workshop & ICGPSRO 2011 (Taipei, Taiwan 2011).
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Wickert, J.; Arras, C.; Beyerle, G.; Ge, M.; Flechtner, F.; Healy, S. B.; Heise, S.; Huan, C. Y.; Kuo, B.; Marquardt, C.; Michalak, G.; Jakowski, N.; Schmidt, T.; Semmling, M. (2011): Radio occultation with navigation satellites: Recent results and prospects with Galileo. 3rd Galileo Science Colloquium (Copenhagen 2011).
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Wickert, J.; Beyerle, G.; Arras, C.; Falck, C.; Faber [Haser], A.; Heise, S.; Grunwaldt, L.; Koehler, W.; König, R.; Massmann, F.-H.; Michalak, G.; Ramatschi, M.; Schmidt, T.; Zus, F. (2011): Global atmosphere sounding with TerraSAR-X GPS radio occultation: Status and recent results, Poster. 4th TerraSAR-X Science Team Meeting (Oberpfaffenhofen 2011).
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Arras, C.; Beyerle, G.; Faber [Haser], A.; Heise, S.; Michalak, G.; Schmidt, T.; Semmling, M.; Stosius, R.; Wickert, J.; Zus, F. (2010): Radio occultation at GFZ: Recent activities. GRAS-SAG Meeting, EUMETSAT (Darmstadt 2010).
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Heise, S.; Arras, C.; Beyerle, G.; Falck, C.; Faber [Haser], A.; Köhler, W.; Michalak, G.; Schmidt, T.; Wickert, J.; Zus, F. (2010): GPS radio occultation at GFZ: Status and recent results from GRACE. GRACE Science Team Meeting (Potsdam 2010).
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Michalak, G.; König, R. (2010): Near-Real Time Orbit Determination for the GPS, CHAMP, GRACE, TerraSAR-X, and TanDEM-X satellites. 38th COSPAR Scientific Assembly (Bremen 2010).
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Wickert, J.; Arras, C.; Beyerle, G.; Faber [Haser], A.; Heise, S.; Michalak, G.; Schmidt, T.; Semmling, M.; Stosius, R.; Zus, F. (2010): GPS remote sensing: Recent results from GFZ. International Beacon Satellite Symposium (Barcelona 2010).
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Wickert, J.; Arras, C.; Beyerle, G.; Grunwaldt, L.; Faber [Haser], A.; Heise, S.; Michalak, G.; Schmidt, T.; Semmling, M.; Stosius, R.; Zus, F. (2010): GNSS radio occultation at GFZ: Recent results and activities. OPAC 2010 - Joint OPAC-4 & GRAS SAF Climate Workshop (Graz 2010).
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Beyerle, G.; Grunwaldt, L.; Heise, S.; Köhler, W.; Schmidt, T.; Choi, K.-R.; Michalak, G.; König, R.; Rothacher, M.; Wickert, J. (2009): First results from the GPS atmospheric remote sensing experiment TOR aboard TerraSAR-X. General Assembly European Geosciences Union (Vienna, Austria 2009).
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Heise, S.; Beyerle, G.; Grunwaldt, L.; Köhler, W.; Schmidt, T.; Choi, K.-R.; Michalak, G.; König, R.; Rothacher, M.; Wickert, J. (2009): First results from the GPS atmospheric remote sensing experiment TOR aboard TerraSAR-X. 24th Meeting of the ESA/EUMETSAT GNSS Receiver for Atmospheric Sounding Science Advisory Group (GRAS-SAG) (Darmstadt, Germany 2009).
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Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Deng, Z.; Dick, G.; Gendt, G.; Heise, S.; Michalak, G.; Ramatschi, M. (2009): Ground and space based GPS atmosphere sounding: recent results from GFZ. IAG 2009 Scientific Assembly 'Geodesy for Planet Earth' (Buenos Aires, Argentina 2009).
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Wickert, J.; Arras, C.; Brieß, K.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Herfort, M.; Heise, S.; Köhler, W.; Massmann, F. H.; Michalak, G.; Schmidt, T.; Stosius, R. (2009): GPS radio occultation at GFZ: Recent activities and plans. International Workshop GPS Radio Occultation, NASA/JPL (Pasadena 2009).
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Wickert, J.; Arras, C.; Ao, C. O.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Healy, S. B.; Heise, S.; Helm, A.; Huang, C. Y.; Jakowski, N.; König, R.; Mannucci, T.; Mayer, C.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Tapley, B. (2008): Tapley CHAMP, GRACE, SAC-C, TerraSAR-X/Tandem-X, Science results, status and future prospects. ECMWF/GRAS SAF joint workshop on 'The assimilation of GPS radio-occultation (GPS RO) measurements', ECMWF (Reading, UK 2008).
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Wickert, J.; Arras, C.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Heise, S.; Köhler, W.; König, R.; Michalak, G.; Ramatschi, M.; Rothacher, M.; Schmidt, T.; Stosius, R. (2008): GPS radio occultation: Recent results from GFZ. 4th Asian Space Conference (Taipeh 2008).
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Wickert, J.; Arras, C.; Beyerle, G.; Falck, C.; Grunwaldt, L.; Helm, A.; Heise, S.; Köhler, W.; König, R.; Michalak, G.; Ramatschi, M; Rothacher, M.; Schmidt, T.; Stosius, R. (2008): GPS radio occultation: Recent activities at GFZ. 4th Asian Space Conference & FORMOSAT-3/COSMIC International Workshop (Taipei, Taiwan 2008).
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Wickert, J.; Beyerle, G.; Arras, C.; Choi, K. R.; Falck, C.; Heise, S.; Grunwaldt, L.; Köhler, W.; Massmann, F. H.; Michalak, G.; Ramatschi, M.; Rothacher, M.; Schmidt, T.; Tapley, B. (2008): GPS radio occultation with TerraSAR-X: Introduction, status and initial results. 3rd TerraSAR-X Science Team Meeting (München 2008).
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Wickert, J.; Beyerle, G.; Arras, C.; Choij, K.R.; Falck, C.; Heise, S.; Grunwaldt, L.; Köhler, W.; König, R.; Massmann, F.-H.; Michalak, G.; Ramatschi, M.; Rothacher, M.; Tapley, B. (2008): GPS radio occultation with TerraSAR-X: Introduction, status and initial results. 2nd TerraSAR-X Science Meeting (Oberpfaffenhofen 2008).
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Wickert, J.; Beyerle, G.; Cheng, F. Z.; Healy, S.; Heise, S.; Michalak, G.; Rocken, C.; Rothacher, M.; Schmidt, T.; Viehweg, C.; Tapley, B. (2007): Global atmospheric sounding using GPS radio occultation: Recent results from CHAMP, GRACE and COSMIC/FORMOSAT-3 (solicited). General Assembly European Geosciences Union (EGU) (Vienna, Austria 2007).
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Wickert, J.; Michalak, G.; Schmidt, T.; Beyerle, G.; Falck, C.; Galas, R.; Heise, S.; Healy, S.; Viehweg, C.; Flechtner, F.; Grunwaldt, L.; Köhler, W.; König, R.; Massmann, F.-H.; Offiler, D.; Rhodin, A.; Reigber, C.; Rothacher, M.; Tapley, B. (2007): GPS radio occultation: Operational sounding of the atmosphere with GRACE. General Assembly European Geosciences Union (EGU) (Vienna, Austria 2007).
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Wickert, J.; Michalak, G.; Schmidt, T.; Beyerle, G.; Falck, C.; Heise, S.; Viehweg, C.; Flechtner, F.; Grunwaldt, L.; Köhler, W.; König, R.; Massmann, F.-H.; Pingel, D.; Rothacher, M.; Tapley, B. (2007): GPS radio occultation with GRACE: Recent results from GFZ. Joint International GSTM and DFG SPP Symposium (Potsdam 2007).
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Michalak, G.; Wickert, J.; König, R.; Rothacher, M. (2006): Precise satellite orbit determination for GPS radio occultation in near-realtime. GEOTECHNOLOGIEN Statusseminar 'Observation the system Earth from Space' (Bonn 2006).
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Wickert, J.; Beyerle, G.; Cheng, F.; Healy, S. B.; Heise, S.; Huang, C. Y.; Michalak, G.; Offiler, D.; Rothacher, M.; Schmidt, T.; Viehweg, Ch.; Tapley, B. (2006): GPS radio occultation: News from CHAMP and GRACE, initial results from COSMIC/Formosat-3 data analysis. AGU 2006 Fall Meeting (San Francisco, USA 2006).
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Wickert, J.; Beyerle, G.; Falck, C.; Flechtner, F.; Galas, R.; Grunwaldt, L.; Healy, S.; Heise, S.; Köhler, W.; König, R.; Massmann, F.-H.; Michalak, G.; Offiler, D.; Rhodin, A.; Rothacher, M.; Schmidt, T.; Wergen, W. (2006): Global atmospheric data from CHAMP and GRACE in near-real time. GEOTECHNOLOGIEN Statusseminar 'Observation the system Earth from Space' (Bonn 2006).
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Wickert, J.; Beyerle, G.; Heise, S.; Schmidt, T.; Michalak, G.; König, R.; Jakowski, N.; Rothacher, M.; Typley, B. (2006): GPS radio occultation with CHAMP and GRACE: Overview, recent results and outlook to Metop. First EPS/MetOp RAO Workshop (Frascati, Italy 2006).
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Wickert, J.; Michalak, G.; Schmidt, T.; Beyerle, G.; Heise, S.; Viehweg, C.; Cheng, C. Z.; Flechtner, F.; Grunwaldt, L.; Healy, S.; König, R.; Massmann, F.-H.; Offiler, D.; Rhodin, A.; Reigber, C.; Rothacher, M.; Tapley, B. (2006): Global atmospheric data from GRACE: First results and status. GRACE Science Team Meeting (San Francisco, USA 2006).
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Wickert, J.; Michalak, G.; Schmidt, T.; Beyerle, G.; Heise, S.; Viehweg, Ch.; Aparicio, J.; Cheng, C. Z.; Healy, S. B.; Huang, C. Y.; Ozawa, E.; Offiler, D.; Rothacher, M.; Tapley, B. (2006): GPS radio occultation: Overwiev on CHAMP and GRACE results. FORMASAT-3/COSMIC-Workshop (Taipei, Taiwan 2006).
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Wickert, J.; Schmidt, T.; Michalak, G.; Healy, S. B.; Beyerle, G.; Falck, C.; Galas, R.; Heise, S.; Köhler, W.; Rothacher, M.; Offiler, D.; Wergen, W. (2006): GPS based atmospheric sounding with CHAMP: near real time provision of occultation data for numerical weather prediction. 3rd General Assembly European Geosciences Union (Vienna, Austria 2006).
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Dahle, C.; Flechtner, F.; Gruber, C.; König, D.; König, R.; Michalak, G.; Neumayer, K.-H. (2013): GFZ GRACE Level-2 Processing Standards Document for Level-2 Product Release 0005 : revised edition, January 2013. Scientific Technical Report - Data ; 12/02, Deutsches GeoForschungsZentrum GFZ, 21.
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Wickert, J.; Bender, M.; Beyerle, G.; Dick, G.; Gendt, G.; Grunwaldt, L.; Heise, S.; Helm, A.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Viehweg, Ch. (2007): GNSS atmospheric sounding and reflectometry.
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Wickert, J.; Beyerle, G.; Dick, G.; Gendt, G.; Heise, S.; Helm, A.; Michalak, G.; Rothacher, M.; Schmidt, T.; Stosius, R.; Viehweg, Ch. (2006): Atmospheric sounding and reflectometry with GNSS.
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Wickert, J.; Beyerle, G.; Dick, G.; Gendt, G.; Heise, S.; Helm, A.; Michalak, G.; Schmidt, T.; Viehweg, C. (2006): GNSS basierte Fernerkundung: Visionen, Ideen und Fragen.
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