Alexander Kehm, Dipl.-Ing.

Deutsches Geodätisches Forschungsinstitut und
Lehrstuhl für Geodätische Geodynamik (Prof. Seitz)

Postadresse
Arcisstr. 21
80333 München

Tel.: +49 (89) 23031-1294
Fax.: +49 (89) 23031-1240
alexander.kehm@tum.de

Research Area

Satellite Laser Ranging, Regional reference frames

Academic Career

  • 03/2020, Research stay at the NASA Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, USA
  • since 08/2015, Research associate at Deutsches Geodätisches Forschungsinstitut (DGFI-TUM), Munich, Germany
  • 09/2013 - 12/2013, Visiting student at University of Calgary, Canada
  • 03/2012 - 01/2015, Graduate studies of "Geomatics Science" at Technische Universität Graz, Austria (degree: Dipl.-Ing.)
  • 10/2008 - 10/2011, Undergraduate studies of "Bauingenieurwesen und Geodäsie" at Technische Universität Darmstadt, Germany (degree: B.Sc.)

Functions/Memberships

Global Geodetic Observing System (GGOS)

  • Working Group on Performance Simulations and Architectural Trade-Offs (PLATO), Member (since 2016)

International Laser Ranging Service (ILRS)

  • Analysis Standing Committee, Member (since 2018)

Publications

2022

Kehm A., Sánchez L., Bloßfeld M., Seitz M., Drewes H., Angermann D., Seitz F.: Combination Strategy for the Geocentric Realization of Regional Epoch Reference Frames. Journal of Geophysical Research: Solid Earth, 127(10), e2021JB023880, 10.1029/2021jb023880, 2022 (Open Access)

2021

Glomsda M., Seitz M., Bloßfeld M., Kehm A., Gerstl M., Angermann D.: First VLBI-only TRF/CRF solution based on DGFI-TUM data for ITRF2020. In: Rüdiger Haas (Ed.), Proceedings of the 25th EVGA Working Meeting, 2021
Sánchez L., Kehm A.: SIRGAS Regional Network Associate Analysis Centre (IGS RNAAC SIRGAS) Technical Report 2020. International GNSS Service Technical Report 2020, 135-146, 10.48350/156425, 2021

2020

Bloßfeld M., Kehm A.: ILRS Analysis Activities. DGFI-TUM (Deutsches Geodätisches Forschungsinstitut – Technische Universität München), Germany. In: Noll C., Pearlman M. (Eds.), International Laser Ranging Service 2016–2019 Report, 2020
Dill R., Dobslaw H., Hellmers H., Kehm A., Bloßfeld M., Thomas M., Seitz F., Thaller D., Hugentobler U., Schönemann E.: Evaluating Processing Choices for the Geodetic Estimation of Earth Orientation Parameters with Numerical Models of Global Geophysical Fluids. Journal of Geophysical Research: Solid Earth, 125(9), 10.1029/2020JB020025, 2020 (Open Access)

2019

Hellmers H., Thaller D., Bloßfeld M., Kehm A., Girdiuk A.: Combination of VLBI Intensive Sessions with GNSS for generating Low latency Earth Rotation Parameters. Advances in Geosciences, 50, 49–56, 10.5194/adgeo-50-49-2019, 2019 (Open Access)
Kehm A., Bloßfeld M., König P., Seitz F.: Future TRFs and GGOS – where to put the next SLR station?. Advances in Geosciences, 50, 17–25, 10.5194/adgeo-50-17-2019, 2019 (Open Access)

2018

Bloßfeld M., Rudenko S., Kehm A., Panafidina N., Müller H., Angermann D., Hugentobler U., Seitz M.: Consistent estimation of geodetic parameters from SLR satellite constellation measurements. Journal of Geodesy, 92(9), 1003–1021, 10.1007/s00190-018-1166-7, 2018
Kehm A., Bloßfeld M., Pavlis E., Seitz F.: Future global SLR network evolution and its impact on the terrestrial reference frame. Journal of Geodesy, 92(6), 625-635, 10.1007/s00190-017-1083-1, 2018
Männel B. Thaller D., Rothacher M., Böhm J., Müller J., Glaser S., Dach R., Biancale R., Bloßfeld M., Kehm A., Herrera Pinzon I., Hofmann F., Andritsch F., Coulot D., Pollet A.: Recent Activities of the GGOS Standing Committee on Performance Simulations and Architectural Trade-Offs (PLATO). In: Freymueller J. T., Sánchez L. (Eds.), International Symposium on Advancing Geodesy in a Changing World, 10.1007/1345_2018_30, 2018

2012

Mendoza L., Kehm A., Koppert A., Dávila J.M., Gárate J., Becker M.: The Lorca Earthquake observed by GPS: A Test Case for GPS Seismology. Física de la Tierra 24 (2012): 129–150, 10.5209/rev_FITE.2012.v24.40135, 2012

Posters/Presentations

2022

Rudenko S., Bloßfeld M., Kehm A., Dettmering D., Zeitlhöfler J., Glomsda M., Angermann D., Seitz M.: Precise orbit determination of SLR and altimetry satellites using ITRS2020 realizations. The 22nd International Workshop on Laser Ranging, Guadalajara, Spain and online, 2022
Rudenko S., Bloßfeld M., Zeitlhöfler J., Kehm A., Dettmering D., Glomsda M., Angermann D., Seitz M.: Application of the ITRS2020 realizations for precise orbit determination of SLR and altimetry satellites. IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022), Thessaloniki, Greece, 2022
Sánchez L., Drewes H., Kehm A., Seitz M.: SIRGAS2022: Reference frame solution based on the homogeneous reprocessing of the SIRGAS historical data since January 2000. Symposium SIRGAS2022, Santiago de Chile, Chile, 2022
Sánchez L., Kehm A., Drewes H., Seitz M.: SIRGAS Reference Frame Analysis at DGFI-TUM. Symposium SIRGAS2022, Santiago de Chile, Chile, 2022

2021

Seitz M., Glomsda M., Bloßfeld M., Kehm A., Gerstl M., Angermann D.: First VLBI-only TRF/CRF solution based on DGFI-TUM data for ITRF2020. 25th EVGA Working Meeting, 2021 (Poster)

2020

Bloßfeld M., Kehm A., Hellmers H., Dill R., Dowslaw H.: PM5 – hindcast experiments. Progress Meeting 5 to ESA project "Independent Generation of Earth Orientation Parameters", 2020
Dill R., Dobslaw H., Thomas M., Hellmers H., Thaller D., Bloßfeld M., Kehm A., Seitz F.: Validation of Earth rotation time series by comparison of their sub-daily to sub-monthly excitation signal with simulated geophysical fluid model excitations. European Geosciences Union General Assembly 2020, Vienna, Austria, 10.5194/egusphere-egu2020-4530, 2020
Glomsda M., Seitz M., Gerstl M., Kehm A., Bloßfeld M., Angermann D.: Impact of new models for the ITRF2020 in VLBI analysis at DGFI-TUM. AGU Fall Meeting, 2020
Lengert L., Hellmers H., Flohrer C., Thaller D., Kehm A.: Combination of GNSS and VLBI data for consistent estimation of Earth Orientation Parameters. European Geosciences Union General Assembly 2020, Vienna, Austria, 10.5194/egusphere-egu2020-4722, 2020

2019

Bloßfeld M. Jäggi A., Kehm A., Meyer U., Sosnica K.: Evaluating the potential of combined SLR gravity field solutions. COST-G Team Meeting, Bern, Switzerland, 2019
Bloßfeld M., Kehm A.: Status report of the DGFI-TUM ILRS AC. ILRS Analysis Standing Committee Meeting, Vienna, Austia, 2019
Bloßfeld M., Kehm A.: The potential of increased station performances for scientific SLR products. ILRS Technical Workshop 2019, Stuttgart, Germany, 2019
Hellmers H., Thaller D., Bloßfeld M., Kehm A., Girdiuk A.: VLBI/GNSS Rapid combination for generating Earth Orientation Parameters. European Geosciences Union General Assembly 2019, Vienna, Austria, 2019 (Poster)
Hellmers H., Thaller D., Bloßfeld M., Kehm A., Girdiuk A.: Kombination von VLBI Intensive Sessions mit GNSS zur Bestimmung von Erdrotationsparametern mit kurzer Latenzzeit. Frontiers of Geodetic Science 2019, Stuttgart , 2019
Kehm A.: Data analysis demonstration – data download and normal point computation. First One-Day Introductory and Refresher Course on Satellite and Lunar Laser Ranging, Stuttgart, Germany, 2019
Kehm A., Bloßfeld M., Hellmers H., Dill R., Dobslaw H.: ESA-EOP software for final and rapid combination and prediction. Implementation Review meeting to ESA project "Independent Generation of Earth Orientation Parameters" (ESA-EOP), Frankfurt am Main, 2019
Kehm A., König P., Bloßfeld M., Seitz F.: Simulation studies on the location of a future SLR site. GGOS PLATO Standing Committee Meeting, Vienna, Austria, 2019
Kehm A., Sánchez L., Bloßfeld M., Angermann D., Drewes H., Seitz F.: Combination strategies for the realization of an Epoch Reference Frame for South America. European Geosciences Union General Assembly 2019, Vienna, Austria, 2019
Seitz F., Kehm A., König P., Bloßfeld M.: Future TRFs and GGOS – Where to put the next SLR station?. European Geosciences Union General Assembly 2019, Vienna, Austria, 2019 (Poster)
Thaller D., Männel B., Glaser S., Kehm A., Bloßfeld M.: Recent Activities of the GGOS Standing Committee on Performance Simulations and Architectural Trade-Offs (PLATO). Implementation of the Global Geodetic Reference Frame (GGRF) in Latin America, Buenos Aires, Argentina, 2019
Thaller D., Männel B., Glaser S., Rothacher M., Herrera Pinzón I., Bloßfeld M., Kehm A., Andritsch F., Dach R., Böhm J., Pavlis E. C., Pollet A.: The GGOS Standing Committee on Performance Simulations and Architectural Trade-Offs (PLATO). 27th IUGG General Assembly, Montreal, Kanada, 2019

2018

Bloßfeld M., Jäggi A., Kehm A., Meyer U., Sosnica K.: Evaluating the potential of combined SLR gravity field solutions. 21st International Workshop on Laser Ranging, Canberra, Australia, 2018
Bloßfeld M., Kehm A.: Simulation studies for Satellite Laser Ranging at DGFI-TUM. GGOS Standing Commitee PLATO meeting, Vienna, Austria, 2018
Bloßfeld M., Kehm A.: Definition of the interface between rapid and final combination and common software layout. Progress meeting 2a to ESA project ``Independent Generation of Earth Orientation Parameters'' , 2018
Bloßfeld M., Kehm A.: Preliminary assessment of EOP combination using ESA products. Progress meeting 2a to ESA project ``Independent Generation of Earth Orientation Parameters'', 2018
Bloßfeld M., Kehm A., Angermann D.: Determining 'essential' geodetic variables using Satellite Laser Ranging. AGU Fall Meeting, Washington D.C., USA, 2018
Bloßfeld M., Kehm A., Rudenko S.: Status report of the DGFI-TUM ILRS AC. 21st International Workshop on Laser Ranging - ILRS Analysis Standing Committee meeting, Canberra, Australia, 2018
Bloßfeld M., Kehm A., Rudenko S., Angermann D.: The Role of Laser Ranging for the Global Geodetic Observing System GGOS. 21st International Workshop on Laser Ranging, Canberra, Australia, 2018
Bloßfeld M., Kehm A., Thaller D.: Konsistente Verknüpfung der Raumverfahren. FGS Workshop, Bad Kötzting, 2018
Kehm A., Bloßfeld M.: ESA-EOP product contributions (model inventory): current status/ESA contribution to the ILRS: comparison between the ILRS Analysis Centers. Progress Meeting 2 to ESA project "Independent Generation of Earth Orientation Parameters", 2018
Kehm A., Bloßfeld M.: EOP combination scenario and software design. Progress Meeting 2 to ESA project "Independent Generation of Earth Orientation Parameters", 2018
Kehm A., Bloßfeld M.: ESA-EOP combination scenarios and software design. Progress Meeting 3 to ESA project "Independent Generation of Earth Orientation Parameters", 2018
Kehm A., Bloßfeld M., König P., Angermann D., Seitz F.: Satellite Laser Ranging und sein Potential für das Globale Geodätische Beobachtungssystem GGOS – ein Blick in die Zukunft. Geodätische Woche 2018, Frankfurt am Main, 2018
Kehm A., Bloßfeld M., Seitz F.: Extension of the SLR tracking network and its potential for the realization of Terrestrial Reference Frames. 21st International Workshop on Laser Ranging, Canberra, Australia, 2018
Kehm A., Bloßfeld M., Seitz F.: Optimization of the current SLR tracking network: potential for SLR-derived reference frames. 21st International Workshop on Laser Ranging, Canberra, Australia, 2018
König P., Kehm A., Bloßfeld M., Seitz F.: Erweiterung des Bodensegments von Satellite Laser Ranging (SLR) – Realisierung einer Simulationsstudie. Geodätische Woche 2018, Frankfurt am Main, 2018
Rudenko S., Bloßfeld M., Dettmering D., Kehm A.,Zeitlhöfler J., Angermann D.: Impact of various models on orbits of Jason satellites. 42nd COSPAR Scientific Assembly, Pasadena, CA, United States of America, 2018

2017

Bloßfeld M., Rudenko S., Kehm A., Panafidina N., Angermann D., Seitz M.: DGFI part of project PN 6: status report. Status seminar DFG Research Unit FOR1503, Munich, 2017
Bloßfeld M., Rudenko S., Kehm A., Panafidina N., Müller H., Göttl F., Angermann D., Hugentobler U., Seitz M.: Estimation of consistent fundamental geodetic parameters based on SLR satellite constellation measurements. AGU Fall meeting, New Orleans, USA, 2017
Bloßfeld M., Rudenko S., Kehm A., Panafidina N., Müller H., Göttl F., Angermann D., Hugentobler U., Seitz M.: Consistent estimation of station coordinates, Earth orientation parameters and selected low degree Earth's gravity field coefficients from SLR measurements. Ocean Surface Topography Science Team (OSTST) Meeting, Miami, Florida, USA, 2017
Göttl F., Bloßfeld M., Kehm A., Schmidt M., Seitz F.: Towards uncertainties in gravimetrically derived excitation mechanisms of Earth rotation: A case study of degree-1 Stokes coefficients and C20. EGU General Assembly 2017, Vienna, Austria, 2017 (Poster)
Göttl F., Bloßfeld M., Kehm A., Schmidt M., Seitz F.: Determination of accuracy information for effective angular momentum functions derived from gravity field observations. IAG-IASPEI Joint Scientific Assembly, 2017 (Poster)
Kehm A.: ESA EOP model inventory: processing standards. PDR Meeting to ESA project "Independent Generation of Earth orientation parameters", Munich, Germany, 2017
Kehm A., Bloßfeld M., Panafidina N., Rudenko S., Müller H., Angermann D., Hugentobler U., Seitz M.: Konsistente Schätzung geodätischer Parameter mit Satellite Laser Ranging. Geodätische Woche 2017, Berlin, 2017
Kehm A., Bloßfeld M., Seitz F.: E-GRASP and SLR: Impact of an additional orbit on SLR-derived low-degree Stokes coefficients. E-GRASP science team meeting, Vienna, Austria, 2017
Kehm A., Bloßfeld M., Seitz F.: Future evolution of the SLR ground and space segments and its impact on the estimation of TRF, EOP and Stokes coefficients. GGOS PLATO standing commitee meeting, Vienna, Austria, 2017
Kehm A., Bloßfeld M., Seitz F.: Evolution of the SLR ground and space segments and its potential for GGOS. General Assembly 2017, Vienna, Austria, 2017 (Poster)
Kehm A., Bloßfeld M., Seitz F.: Future evolution of the SLR ground segment and its impact on the estimation of TRF and EOP. IGOS Workshop, Wettzell, Germany, 2017
Matsuo K., Otsubo T., Bloßfeld M., Kehm A., Müller H.: SLR contributions to time-variable gravity field and thermospheric neutral density estimates. 2017 ILRS Technical Workshop, Riga, Latvia, 2017
Rudenko S., Bloßfeld M., Müller H., Dettmering D., Angermann D., Kehm A.: Validation of DTRF2014, ITRF2014 and JTRF2014 by precise orbit determination of SLR and altimetry satellites. European Geosciences Union General Assembly 2017, Vienna, Austria, 2017 (Poster)

2016

Bloßfeld M., Müller H., Kehm A., Angermann D.: A comparison of ITRF2014, DTRF2014 and JTRF2014 using SLR. AGU Fall Meeting 2016, San Francisco, CA, 2016 (Poster)
Kehm A., Bloßfeld M., Pavlis E., Seitz F.: Future global SLR network evolution and its impact on the terrestrial reference frame. EGU General Assembly, Vienna, Austria, 2016
Kehm A., Bloßfeld M., Pavlis E., Seitz F.: Future global SLR network evolution and its impact on the terrestrial reference frame. GGOS PLATO Working Group Meeting, Vienna, Austria, 2016
Kehm A., Bloßfeld M., Seitz F.: Verbesserungspotential für die Realisierung geodätischer Referenzrahmen durch ein weiterentwickeltes globales SLR-Stationsnetz. Geodätische Woche 2016, Hamburg, 2016

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