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(Co) Author: Helm, A.

| Paper (ISI journals) [11] |  Chapter in Book [7] |  Conference Paper [56] |  Thesis/Habil [1] |  Miscellaneous [14] |  All [89] |

  Conference Paper  

2010

• Semmling, M.; Beyerle, G.; Stosius, R.; Wickert, J.; Fabra, F.; Cardellach, E.; Rib´o, S.; Rius, A.; Helm, A.; Yudanov, S.; d’Addio, S. (2010): Reflected GPS L1/L2 observations used for Sea Ice remote sensing and altimetry. AGU 2010 Fall Meeting (San Francisco, USA 2010).
  
  | EDOC: 16497 | 

• Stosius, R.; Beyerle, G.; Semmling, M.; Helm, A.; Hoechner, A.; Wickert, J.; Lauterjung, J. (2010): Tsunami detection from space using GNSS reflections: results and activities from GFZ. Proceedings, 30th anniversary IGARSS - IEEE International Geoscience and Remote Sensing Symposium (Honolulu, HI, USA 2010), 3047-3050.
  
  | EDOC: 16042 | 

2009

• Stosius, R.; Beyerle, G.; Helm, A.; Hoechner, A.; Rothacher, M. (2009): Simulation Study on Tsunami Detection from Space Using GNSS-R. General Assembly European Geosciences Union (Vienna, Austria 2009).
  
  | EDOC: 13134 | 

• Stosius, R.; Helm, A.; Beyerle, G.; Hoechner, A.; Lauterjung, J. (2009): GNSS Reflectometry as Tsunami Detection System from Space: A Simulation Study. Abstracts, Geodätische Woche 2009 (Karlsruhe, Rheinstetten 2009), 76.
  
  | EDOC: 14700 | 

• Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Chen, J.; Dick, G.; Ge, M.; Heise, S.; Helm, A.; Rothacher, M.; Ramatschi, M.; Schmidt, T.; Stosius, R. (2009): GNSS atmosphere sounding at GFZ : Overview and recent results. International Technical Meeting on GNSS ( (ITM-GNSS) (Beijing 2009).
  
  | EDOC: 13823 | 

• 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).
  
  | EDOC: 13386 | 

2008

• Beyerle, G.; Arras, C.; Schmidt, T.; Heise, S.; Wickert, J.; Helm, A.; Stosius, R.; Rothacher, M.; Montenbruck, O. (2008): GNSS Remote sensing: An opportunity for ACES. International Workshop 'ACES and Future GNSS-based Earth Observation and Navigation' (Munich 2008).
  
  | EDOC: 11573 | 

• Helm, A.; Beyerle, G.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Nitschke, M.; Gruber, T.; Hess, M. P.; Wickert, J.; Rothacher, M. (2008): GNSS Reflectometry at GFZ. Workshop on 'ACES and Future GNSS-based Earth Observation and Navigation' (München 2008).
  
  | EDOC: 11557 | 

• Helm, A.; Beyerle, G.; Stosius, R.; Rothacher, M. (2008): Using reflected Global Navigation Satellite System signals for remote sensing: Some overview. CEOS WGCV Microwave Sensors Sub-group Meeting (Noordwijk 2008).
  
  | EDOC: 10933 | 

• Helm, A.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Beyerle, G.; Rothacher, M. (2008): Ground-based water level observations at Lake Walchen with reflected GPS L1 C/A and L2C signals. General Assembly European Geosciences Union (Vienna, Austria 2008).
  
  | EDOC: 11250 | Abstract | 

• Helm, A.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Beyerle, G.; Rothacher, M. (2008): Utilizing ocean reflected GPS L1 C/A and the new GPS L2C signals for tsunami detection from space:possible small satellite constellations and the GORS instrument. International Conference on Tsunami Warning (ICTW) (Bali, Indonesia 2008), 1-8.
  
  | EDOC: 12004 | Abstract | PDF | 

• Helm, A.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Renaudie, C.; Bender, M.; Dick, G.; Beyerle, G.; Wickert, J.; Rothacher, M. (2008): GNSS-R carrier phase altimetry with GPS L2C signals and status of the GORS and GORS follow-on space receiver prototypes. GNSS-R’08 Workshop on GNSS Reflectometry (Noordwijk 2008).
  
  | EDOC: 12003 | Abstract | 

• Helm, A.; Wetzel, H.-U.; Falck, C.; Michajljow, W.; Bens, O.; Mayer, C.; Lambrecht, A.; Hagg, W.; Dudashvili, A.; Rothacher, M. (2008): The 2005 Lake Merzbacher GLOF event and status of future planned activities in the Tien Shan region. General Assembly European Geosciences Union (Vienna, Austria 2008).
  
  | EDOC: 11495 | Abstract | 

• Helm, A.; Wetzel, H.-U.; Michajljow, W.; Mayer, C.; Lambrecht, A.; Hagg, W.; Dudashvili, A.; Beyerle, G.; Rothacher, M. (2008): Using Reflected GPS Signals for the Observation of the Second 2005 Lake Merzbacher GLOF Event. International Workshop 'Glacial Lake Outburst Floods in Central Asia - GLOF' (Bishkek, Kyrgyzstan 2008).
  
  | EDOC: 11498 | Abstract | 

• Stosius, R.; Helm, A.; Beyerle, G.; Hoechner, A.; Wickert, J.; Rothacher, M. (2008): Simulation of GNSS-R tsunami detection from space applied to the 2004 Sumatra tsunami event. GNSS-R’08 Workshop on GNSS Reflectometry (Noordwijk 2008).
  
  | EDOC: 12649 | 

• Stosius, R.; Helm, A.; Cardellach, E.; Beyerle, G.; Rius, A.; Rotacher, A. (2008): GNSS reflectometry simulation studies within GITEWS and comparison between simulated and scanned waveforms at Lake Walchen. General Assembly European Geosciences Union (Vienna, Austria 2008).
  
  | EDOC: 11361 | 

• Svehla, D.; Rothacher, M.; Salomon, C.; Beyerle, G.; Wickert, J.; Helm, A.; Ziebart, M.; Dow, J.; Cacciapuoti, L. (2008): Galileo on board International Space Station and combination with the ACES Mission. 22nd European Frequency and Time Forum (Toulouse, France 2008).
  
  | EDOC: 11561 | 

• Svehla, D.; Rothacher, M.; Salomon, C.; Beyerle, G.; Wickert, J.; Helm, A.; Ziebart, M.; Dow, J.; Cacciapuoti, L.; Börner, T.; Montenbruck, O.; Rivas, R.; Rius, A.; Cardellach, E.; Gruber, T. (2008): GALILEO on board the International Space Station, the last 5 years. GNSS-R’08 Workshop on GNSS Reflectometry (Noordwijk 2008).
  
  | EDOC: 13126 | 

• Svehla, D.; Rothacher, M.; Salomon, C.; Wickert, J.; Helm, A.; Beyerle, G.; Ziebarth, M.; Dow, J. (2008): Geodesy Part of the ACES Mission: GALILEO on Board the International Space Station. International Workshop 'ACES and Future GNSS-based Earth Observation and Navigation' (Munich 2008).
  
  | EDOC: 11574 | 

• 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).
  
  | EDOC: 11575 | 

• Wickert, J.; Arras, C.; Bender, M.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): Water vapor measurements using GPS: Recent activities at GFZ Potsdam. International PGGM-IAGOS Workshop (Taipeh 2008).
  
  | EDOC: 11587 | 

• Wickert, J.; Arras, C.; Beyerle, G.; Dick, G.; Heise, S.; Helm, A.; Ramatschi, M.; Schmidt, T.; Stosius, R.; Rothacher, M. (2008): GPS Atmosphere Sounding at GFZ: Overview and comparison of CHAMP data with MOZAIC. International PGGM-IAGOS Workshop (Taipeh 2008).
  
  | EDOC: 11569 | 

• 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).
  
  | EDOC: 13296 | 

• 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).
  
  | EDOC: 12173 | 

2007

• Helm, A.; Beyerle, G.; Nitschke, M.; Wetzel, H.-U.; Michajljow, W.; Rothacher, M. (2007): Using reflected GPS signals for remote sensing: Introduction and results from recent experiments. Workshop New Earth Observation Techniques for Tsunami Detection and Geohazards Monitoring (Jakarta 2007).
  
  | EDOC: 10917 | 

• Helm, A.; Beyerle, G.; Stosius, R.; Montenbruck, O.; Yudanov, S.; Rothacher, M. (2007): The GNSS Occultation, Reflectometry and Scatterometry Space Receiver Gors: Current Status and Future Plans Within GITEWS. 1st Colloquium Scientific and Fundamental Aspects of the Galileo Programme (Cité de l’Espace, Toulouse, France 2007).
  
  | EDOC: 10650 | Abstract | 

• Helm, A.; Montenbruck, O.; Ashjaee, J.; Yudanov, S.; Beyerle, G.; Stosius, R.; Rothacher, M. (2007): GORS - A GNSS Occultation, Reflectometry and Scatterometry Space Receiver. 20th International Technical Meeting of the Satellite Division of The Institute of Navigation - ION GNSS (Fort Worth, Texas, USA 2007), 2011-2021.
  
  | EDOC: 10643 | Abstract | 

• Helm, A.; Stosius, R.; Beyerle, G.; Montenbruck, O.; Rothacher, M. (2007): Status of GNSS reflectometry related receiver developments and feasibility studies within the German Indonesian Tsunami Early Warning System. IEEE International Geoscience and Remote Sensing Symposium - IGARSS 2007 (Barcelona, Spain 2007), 5084-5087.
  
  | EDOC: 10569 | Abstract | 10.1109/IGARSS.2007.4424005 | 

• Helm, A.; Stosius, R.; Montenbruck, O.; Asjaee, J.; Yudanov, S.; Beyerle, G.; Rothacher, M. (2007): The GITEWS GNSS Occultation, Reflectometry and Scatterometry Space Receiver GORS. Workshop New Earth Observation Techniques for Tsunami Detection and Geohazards Monitoring (Jakarta 2007).
  
  | EDOC: 10918 | 

• Helm, A.; Wickert, J.; Beyerle, G.; Schmidt, T.; Heise, S.; Stosius, R.; Sobolev, S. V.; Babeyko, A. Y.; Rothacher, M.; Yudanov, S.; Ashjaee, J.; Chen, R.; Rocken, C. (2007): New GNSS Remote Sensing Opportunities with ACES. ACES IWG Meeting (Paris 2007).
  
  | EDOC: 10934 | 

• Montenbruck, O.; Markgraf, M.; Garcia-Fernandez, M.; Helm, A. (2007): GPS for Microsatellites - Status and Perspectives. 6th IAA Symposium on Small Satellites for Earth Observation (Berlin 2007), 1-8.
  
  | EDOC: 10688 | Abstract | 

2006

• Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Coastal altimetry at the Baltic Sea off-shore Rugen using L1 carrierphase-delay observations of reflected GPS signals at low elevation angles. GNSSR’06 - Workshop on GNSS Reflections (Noordwijk, The Netherlands, 2006), 1-7.
  
  | EDOC: 10667 | 

• Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Remote monitoring of the Baltic Sea surface off-shore Rügen by ground-based observations of reflected GPS signals. 3rd General Assembly European Geosciences Union (Vienna, Austria 2006).
  
  | EDOC: 9029 | 

• Helm, A.; Wetzel, H.-U.; Michajljow, W.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Monitoring the 2005 dam failure event of Merzbacher glacier lake with ground-based observations of reflected GPS signals. 3rd General Assembly European Geosciences Union (Vienna, Austria 2006).
  
  | EDOC: 9033 | 

• Helm, A.; Wetzel, H.-U.; Michajljow, W.; Beyerle, G.; Reigber, C.; Rothacher, M. (2006): Natural hazard monitoring with L1 carrier-phase-delay observations of reflectedGPS signals: The 2005 dam failure event of Merzbacher glacier lake. GNSSR’06 - Workshop on GNSS Reflections (Noordwijk, The Netherlands 2006), 1-8.
  
  | EDOC: 10666 | Abstract | 

2005

• Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of lake level heights by ground-based observations of reflected GPS signals. 2nd General Assembly European Geosciences Union (Vienna, Austria 2005).
  
  | EDOC: 6868 | 

• Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of ocean heights by ground-based observations of reflected GPS signals: 2 case studies. GNSS Reflection Workshop 2005 (Guildford, UK 2005).
  
  | EDOC: 7787 | 

• Helm, A.; Beyerle, G.; Reigber, C.; Rothacher, M. (2005): Remote monitoring of ocean heights in coastal areas by ground-based observations of reflected GPS signal. 2nd General Assembly European Geosciences Union (Vienna, Austria 2005).
  
  | EDOC: 6869 | 

2004

• Beyerle, G.; Helm, A.; Nitschke, M.; Reigber, C. (2004): Altimetry and reflectometry with CHAMP using coherent GPS signal reflections: A feasibility study. Joint CHAMP/GRACE Science Meeting (Potsdam 2004).
  
  | EDOC: 5811 | 

• Helm, A.; Beyerle, G.; Nitschke, M. (2004): Monitoring lake surface height changes with a ground-based GPS reflectometry receiver. 1st General Assembly European Geosciences Union (Nice, France 2004).
  
  | EDOC: 5847 | 

2003

• Schöne, T.; Helm, A.; Braun, A.; Wen, H.; Reigber, C. (2003): An online satellite altimetry data processing system: ADS central. 23rd General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Sapporo, Japan 2003).
  
  | EDOC: 5848 | 

2002

• Helm, A.; Braun, A.; Wen, H.; Schöne, T.; Reigber, C. (2002): An Online Satellite Altimetry Data Processing System: ADS Central. 27th General Assembly European Geophysical Society (EGS) (Nice France 2002).
  
  | EDOC: 6250 | 

2001

• Eickschen, S.; Schöne, T.; Braun, A.; Helm, A. (2001): Steps towards an improved algorithm for ocean near surface wind speeds derived from satellite radar altimeter data. AGU 2001 Fall Meeting (San Fracisco 2001).
  
  | EDOC: 5850 | 

• Helm, A.; Braun, A.; Eickschen, S.; Rentsch, M.; Schöne, T. (2001): Calibration of the shuttle radar topography mission X-SAR instrument using altimetry data. 26th General Assembly of the European Geophysical Society (EGS) ( Nice 2001).
  
  | EDOC: 5851 | 

• Larter, S. R.; Wilhelms, A.; Di Primio, R.; Zwach, C.; Aplin, A. C.; Bowler, B.; Jones, M.; Telnaes, N. (2001): The controls on the composition of biodegraded oils in the deep subsurface. Some rules of biodegradation. 20th International Meeting on Organic Geochemistry.
  
  | EDOC: 3133 | 

• Oldenburg, T. B. P.; Wilkes, H.; Horsfield, B.; Stoddart, D.; Wilhelms, A. (2001): Biodegradation of crude oils in the petroleum systems offshore Norway: New molecular insights from functionalized petroleuem constituents. Earth System Processes - Global Meeting (Edinburgh 2001).
  
  | EDOC: 3136 | 

• Oldenburg, T. B. P.; Wilkes, H.; Horsfield, B.; van Duin, A. C. T.; Stoddart, D.; Wilhelms, A. (2001): Tracing migration, water washing and biodegradation in the Tampen Spur, offshore Norway, using xanthones, carbazoles and fluorenones. 20th International Meeting on Organic Geochemistry.
  
  | EDOC: 3137 | 

• Wilhelms, A.; Larter, S. R.; Head, I. M.; Farrimond, P.; Zwach, C.; Di Primio, R. (2001): Palepasteurisation and the base of the biosphere - A petroleum geochemical viewpoint. 20th International Meeting on Organic Geochemistry.
  
  | EDOC: 3148 | 

• Wilkes, H.; Fischer, T.; Oldenburg, T. B. P.; Horsfield, B.; Stoddart, D.; Wilhelms, A. (2001): Aliphatic and aromatic carboxylic acids in oil field waters: An indicator of anaerobic biodegradation of hydrocarbons in petroleum reservoirs?. 20th International Meeting on Organic Geochemistry (IMOG) (Nancy, France 2001).
  
  | EDOC: 3149 | 

2000

• Braun, A.; Eickschen, S.; Helm, A.; Reigber, C.; Rentsch, M.; Schöne, T. (2000): The ENVISAT RA-2 Value-Added Ocean/Ice Processor at GFZ Potsdam. Proceedings, ERS-ENVISAT Symposium (Gothenburg, Sweden 2000).
  
  | EDOC: 2332 | 

• Braun, A.; Helm, A.; Rentsch, M.; Schöne, T. (2000): Meeresspiegeländerungen in Svalbard aus Altimetrie und Pegelmessungen. 60. Jahrestagung der Deutschen Geophysikalischen Gesellschaft ( DGG ) (München 2000).
  
  | EDOC: 5853 | 

• Helm, A.; Braun, A.; Rentsch, M.; Schöne, T. (2000): Bestimmung der instantanen Meereshöhe mit synthetischen Altimetrie Daten. 60. Jahrestagung der Deutschen Geophysikalischen Gesellschaft ( DGG ) (München 2000).
  
  | EDOC: 5852 | 

• Rentsch, M.; Braun, A.; Helm, A.; Schöne, T. (2000): Oceanographic data product generation at GFZ. 25th General Assembly of the European Geophysical Society (EGS) (Nice, France 2000).
  
  | EDOC: 5854 | 

• Rentsch, M.; Braun, A.; Helm, A.; Schöne, T. (2000): Operational altimetry at GFZ - from ERS-2 to Envisat. ERS – ENVISAT Symposium (Gothenburg, Sweden 2000).
  
  | EDOC: 5855 | 

1999

• Braun, A.; Helm, A.; Rentsch, M.; Schöne, T. (1999): Calibration of ERS altimetric data in the western Spitsbergen shelf through tide gauge data. EGS Vening Meinesz Conference (Loiro-Porto San Paolo, Italy 1999).
  
  | EDOC: 5856 | 

• Helm, A.; Braun, A.; Rentsch, M.; Schöne, T. (1999): Calibration of X-SAR during the Shuttle Radar Topography Mission Using Synthetic Altimeter Data. AGU 1999 Fall Meeting (San Francisco, USA 1999).
  
  | EDOC: 2643 | 

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