Pascal Willis
Verified @gmail.com
Scopus Publications
- Editorial
Pascal Willis
Advances in Space Research, 2024 - Editorial
Pascal Willis
Advances in Space Research, 2022 - Editorial
Pascal Willis
Advances in Space Research, 2021 - GipsyX/RTGx, a new tool set for space geodetic operations and research
Willy Bertiger, Yoaz Bar-Sever, Angie Dorsey, Bruce Haines, Nate Harvey, Dan Hemberger, Michael Heflin, Wenwen Lu, Mark Miller, Angelyn W. Moore, Dave Murphy, Paul Ries, Larry Romans, Aurore Sibois, Ant Sibthorpe, Bela Szilagyi, Michele Vallisneri, Pascal Willis
Advances in Space Research, 2020
GipsyX/RTGx is the Jet Propulsion Laboratory’s (JPL) next generation software package for positioning, navigation, timing, and Earth science using measurements from three geodetic techniques: Global Navigation Satellite Systems (GNSS), Satellite Laser Ranging (SLR), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS); with Very Long Baseline Interferometry (VLBI) under development. The software facilitates combined estimation of geodetic and geophysical parameters using a Kalman filter approach on real or simulated data in both post-processing and in real-time. The estimated parameters include station coordinates and velocities, satellite orbits and clocks, Earth orientation, ionospheric and tropospheric delays. The software is also capable of full realization of a dynamic terrestrial reference through analysis and combination of time series of ground station coordinates. Applying lessons learned from its predecessors, GIPSY-OASIS and Real Time GIPSY (RTG), GipsyX/RTGx was re-designed from the ground up to offer improved precision, accuracy, usability, and operational flexibility. We present some key aspects of its new architecture, and describe some of its major applications, including Real-time orbit determination and ephemeris predictions in the U.S. Air Force Next Generation GPS Operational Control Segment (OCX), as well as in JPL’s Global Differential GPS (GDGPS) System, supporting User Range Error (URE) of <5 cm RMS; precision post-processing GNSS orbit determination, including JPL’s contributions to the International GNSS Service (IGS) with URE in the 2 cm RMS range; Precise point positioning (PPP) with ambiguity resolution, both statically and kinematically, for geodetic applications with 2 mm horizontal, and 6.5 mm vertical repeatability for static positioning; Operational orbit and clock determination for Low Earth Orbiting (LEO) satellites, such as NASA’s Gravity Recovery and Climate Experiment (GRACE) mission with GRACE relative clock alignment at the 20 ps level; calibration of radio occultation data from LEO satellites for weather forecasting and climate studies; Satellite Laser Ranging (SLR) to GNSS and LEO satellites, DORIS-based and multi-technique orbit determination for LEO; production of terrestrial reference frames and Earth rotation parameters in support of JPL’s contribution to the International Terrestrial Reference Frame (ITRF). - Editorial
Pascal Willis
Advances in Space Research, 2019 - Editorial
Pascal Willis
Advances in Space Research, 2019 - DPOD2014: A new DORIS extension of ITRF2014 for precise orbit determination
Guilhem Moreaux, Pascal Willis, Frank G. Lemoine, Nikita P. Zelensky, Alexandre Couhert, Hanane Ait Lakbir, Pascale Ferrage
Advances in Space Research, 2019 - Editorial
Pascal Willis
Advances in Space Research, 2017 - Is the Jason-2 DORIS oscillator also affected by the South Atlantic Anomaly?
Pascal Willis, Michael B. Heflin, Bruce J. Haines, Yoaz E. Bar-Sever, Willy I. Bertiger, Mioara Mandea
Advances in Space Research, 2016 - The International DORIS Service contribution to the 2014 realization of the International Terrestrial Reference Frame
Guilhem Moreaux, Frank G. Lemoine, Hugues Capdeville, Sergey Kuzin, Michiel Otten, Petr Štěpánek, Pascal Willis, Pascale Ferrage
Advances in Space Research, 2016 - Multi-technique comparison of atmospheric parameters at the DORIS co-location sites during CONT14
Robert Heinkelmann, Pascal Willis, Zhiguo Deng, Galina Dick, Tobias Nilsson, Benedikt Soja, Florian Zus, Jens Wickert, Harald Schuh
Advances in Space Research, 2016 - Horizontal and vertical velocities derived from the IDS contribution to ITRF2014, and comparisons with geophysical models
G. Moreaux, F.G. Lemoine, D.F. Argus, A. Santamaría-Gómez, P. Willis, L. Soudarin, M. Gravelle, P. Ferrage
Geophysical Journal International, 2016 - Preface
Pascal Willis
Advances in Space Research, 2016 - IAG history: The years of world wars and aftermath (1917–1959)
Claude Boucher, Pascal Willis
International Association of Geodesy Symposia, 2016 - DPOD2008: A doris-oriented terrestrial reference frame for precise orbit determination
Pascal Willis, Nikita P. Zelensky, John Ries, Laurent Soudarin, Luca Cerri, Guilhem Moreaux, Frank G. Lemoine, Michiel Otten, Donald F. Argus, Michael B. Heflin
International Association of Geodesy Symposia, 2016 - The international DORIS service (IDS): Recent developments in preparation for ITRF2013
Pascal Willis, Frank G. Lemoine, Guilhem Moreaux, Laurent Soudarin, Pascale Ferrage, John Ries, Michiel Otten, Jerome Saunier, Carey Noll, Richard Biancale, Brian Luzum
International Association of Geodesy Symposia, 2016 - Preface
Pascal Willis
Advances in Space Research, 2015 - A high-quality, homogenized, global, long-term (1993–2008) DORIS precipitable water data set for climate monitoring and model verification
Olivier Bock, Pascal Willis, Junhong Wang, Carl Mears
Journal of Geophysical Research, 2014 - DORIS tropospheric estimation at IGN: Current strategies, GPS intercomparisons and perspectives
International Association of Geodesy Symposia, 2014 - Troposphere delays from space geodetic techniques, water vapor radiometers, and numerical weather models over a series of continuous VLBI campaigns
Kamil Teke, Tobias Nilsson, Johannes Böhm, Thomas Hobiger, Peter Steigenberger, Susana García-Espada, Rüdiger Haas, Pascal Willis
Journal of Geodesy, 2013 - Satellite altimetry calibration and deformation monitoring using GNSS
Pascal Willis
Advances in Space Research, 2013 - DORIS and GPS monitoring of the Gavdos calibration site in Crete
Pascal Willis, Stelios Mertikas, Don F. Argus, Olivier Bock
Advances in Space Research, 2013 - A new velocity field for Africa from combined GPS and DORIS space geodetic Solutions: Contribution to the definition of the African reference frame (AFREF)
E. Saria, E. Calais, Z. Altamimi, P. Willis, H. Farah
Journal of Geophysical Research Solid Earth, 2013 - New Zealand 20th century sea level rise: Resolving the vertical land motion using space geodetic and geological data
Abdelali Fadil, Paul Denys, Robert Tenzer, Hugh R. Grenfell, Pascal Willis
Journal of Geophysical Research Oceans, 2013 - Estimating horizontal tropospheric gradients in DORIS data processing: Preliminary results
P. Willis, Y. E. Bar-Sever, O. Bock
International Association of Geodesy Symposia, 2012 - Recent improvements in DORIS data processing at IGN in view of ITRF2008, the ignwd08 solution
P. Willis, M. L. Gobinddass, B. Garayt, H. Fagard
International Association of Geodesy Symposia, 2012 - Calibration of wet tropospheric delays in GPS observation using Raman lidar measurements
P. Bosser, C. Thom, O. Bock, J. Pelon, P. Willis
International Association of Geodesy Symposia, 2012 - Multi-technique comparison of troposphere zenith delays and gradients during CONT08
Kamil Teke, Johannes Böhm, Tobias Nilsson, Harald Schuh, Peter Steigenberger, Rolf Dach, Robert Heinkelmann, Pascal Willis, Rüdiger Haas, Susana García-Espada, Thomas Hobiger, Ryuichi Ichikawa, Shingo Shimizu
Journal of Geodesy, 2011 - Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records
Abdelali Fadil, Lydie Sichoix, Jean-Pierre Barriot, Pascal Ortéga, Pascal Willis
Comptes Rendus Geoscience, 2011 - Scientific applications of Galileo and other Global navigation satellite systems (II)
Pascal Willis
Advances in Space Research, 2011 - Preface Scientific applications of Galileo and other Global Navigation Satellite Systems (I)
Pascal Willis
Advances in Space Research, 2011 - DORIS: Precise orbit determination and applications to the Earth sciences
Pascal Willis
Advances in Space Research, 2010 - An inter-comparison of zenith tropospheric delays derived from DORIS and GPS data
Olivier Bock, Pascal Willis, Maïté Lacarra, Pierre Bosser
Advances in Space Research, 2010 - Refining DORIS atmospheric drag estimation in preparation of ITRF2008
Marie-Line Gobinddass, Pascal Willis, Michel Menvielle, Michel Diament
Advances in Space Research, 2010 - IDS contribution to ITRF2008
Jean-Jacques Valette, Frank G. Lemoine, Pascale Ferrage, Philippe Yaya, Zuheir Altamimi, Pascal Willis, Laurent Soudarin
Advances in Space Research, 2010 - Towards development of a consistent orbit series for TOPEX, Jason-1, and Jason-2
F.G. Lemoine, N.P. Zelensky, D.S. Chinn, D.E. Pavlis, D.D. Rowlands, B.D. Beckley, S.B. Luthcke, P. Willis, M. Ziebart, A. Sibthorpe, J.P. Boy, V. Luceri
Advances in Space Research, 2010 - DORIS/SLR POD modeling improvements for Jason-1 and Jason-2
Nikita P. Zelensky, Frank G. Lemoine, Marek Ziebart, Ant Sibthorpe, Pascal Willis, Brian D. Beckley, Steven M. Klosko, Douglas S. Chinn, David D. Rowlands, Scott B. Luthcke, Despina E. Pavlis, Vincenza Luceri
Advances in Space Research, 2010 - Precision orbit determination standards for the Jason series of altimeter missions
L. Cerri, J. P. Berthias, W. I. Bertiger, B. J. Haines, F. G. Lemoine, F. Mercier, J. C. Ries, P. Willis, N. P. Zelensky, M. Ziebart
Marine Geodesy, 2010 - U-SBAS: A universal multi-SBAS standard to ensure compatibility, interoperability and interchangeability
Mohamed Sahmoudi, Jean-Luc Issler, Felix Perozans, Youssef Tawk, Aleksandar Jovanovic, Cyril Botteron, P-A. Farine, Landry Rene, Veronique Dehant, Alessandro Caporali, Serge Reboul, Pascal Willis
Programme and Abstract Book 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on Gnss Signals and Signal Processing Navitec 2010, 2010 - Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations
Matt A. King, Zuheir Altamimi, Johannes Boehm, Machiel Bos, Rolf Dach, Pedro Elosegui, François Fund, Manuel Hernández-Pajares, David Lavallee, Paulo Jorge Mendes Cerveira, Nigel Penna, Riccardo E. M. Riva, Peter Steigenberger, Tonie van Dam, Luca Vittuari, Simon Williams, Pascal Willis
Surveys in Geophysics, 2010 - DORIS: Scientific applications in geodesy and geodynamics
P. Willis
Advances in Space Research, 2010 - Contributions of the French Institut Géographique National (IGN) to the International DORIS Service
Pascal Willis, Claude Boucher, Hervé Fagard, Bruno Garayt, Marie-Line Gobinddass
Advances in Space Research, 2010 - The International DORIS Service (IDS): Toward maturity
Pascal Willis, Hervé Fagard, Pascale Ferrage, Frank G. Lemoine, Carey E. Noll, Ron Noomen, Michiel Otten, John C. Ries, Markus Rothacher, Laurent Soudarin, Gilles Tavernier, Jean-Jacques Valette
Advances in Space Research, 2010 - The angular velocities of the plates and the velocity of Earth's centre from space geodesy
Donald F. Argus, Richard G. Gordon, Michael B. Heflin, Chopo Ma, Richard J. Eanes, Pascal Willis, W. Richard Peltier, Susan E. Owen
Geophysical Journal International, 2010 - A case study of using Raman lidar measurements in high-accuracy GPS applications
Pierre Bosser, Olivier Bock, Christian Thom, Jacques Pelon, Pascal Willis
Journal of Geodesy, 2010 - Improving DORIS geocenter time series using an empirical rescaling of solar radiation pressure models
M.L. Gobinddass, P. Willis, O. de Viron, A. Sibthorpe, N.P. Zelensky, J.C. Ries, R. Ferland, Y. Bar-Sever, M. Diament, F.G. Lemoine
Advances in Space Research, 2009 - DPOD2005: An extension of ITRF2005 for Precise Orbit Determination
P. Willis, J.C. Ries, N.P. Zelensky, L. Soudarin, H. Fagard, E.C. Pavlis, F.G. Lemoine
Advances in Space Research, 2009 - Systematic biases in DORIS-derived geocenter time series related to solar radiation pressure mis-modeling
M. L. Gobinddass, P. Willis, O. de Viron, A. Sibthorpe, N. P. Zelensky, J. C. Ries, R. Ferland, Y. Bar-Sever, M. Diament
Journal of Geodesy, 2009 - Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya
Mireille Flouzat, Pierre Bettinelli, Pascal Willis, Jean-Philippe Avouac, Thierry Héritier, Umesh Gautam
Geophysical Journal International, 2009 - The kinematics of Ny-Ålesund from space geodetic data
Halfdan Pascal Kierulf, Bjørn Ragnvald Pettersen, Daniel S. MacMillan, Pascal Willis
Journal of Geodynamics, 2009 - Potential volcanological applications of the DORIS system. A geodetic study of the Socorro Island (Mexico) coordinate time-series
Pierre Briole, Pascal Willis, Jacques Dubois, Olivier Charade
Geophysical Journal International, 2009 - Isostatic stability of the East Antarctic station Dumont d'Urville from long-term geodetic observations and geophysical models
Martine Amalvict, Pascal Willis, Guy Wöppelmann, Erik R. Ivins, Marie-Noëlle Bouin, Laurent Testut, Jacques Hinderer
Polar Research, 2009 - Looking for systematic error in scale from Terrestrial Reference Frames derived from DORIS data
P. Willis, F. G. Lemoine, L. Soudarin
International Association of Geodesy Symposia, 2007 - Status of DORIS stations in Antarctica for precise geodesy
M. Amalvict, P. Willis, K. Shibuya
International Association of Geodesy Symposia, 2007 - DORIS applications for solid earth and atmospheric sciences
Pascal Willis, Laurent Soudarin, Christian Jayles, Lucie Rolland
Comptes Rendus Geoscience, 2007 - GGOS Working Group on Ground Networks Communications
M. Pearlman, Z. Altamimi, N. Beck, R. Forsberg, W. Gurtner, S. Kenyon, D. Behrend, F. G. Lemoine, C. Ma, C. E. Noll, E. C. Pavlis, Z. Malkin, A. W. Moore, F. H. Webb, R. E. Neilan, J. C. Ries, M. Rothacher, P. Willis
International Association of Geodesy Symposia, 2007 - Analysis of DORIS range-rate residuals for TOPEX/Poseidon, Jason, Envisat and SPOT
Eelco Doornbos, Pascal Willis
Acta Astronautica, 2007 - Analysis of a possible future degradation in the DORIS geodetic results related to changes in the satellite constellation
P. Willis
Advances in Space Research, 2007 - DORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame
P. Willis, B.J. Haines, D. Kuang
Advances in Space Research, 2007 - Preface
P. Willis
Journal of Geodesy, 2006 - Error analysis of weekly station coordinates in the DORIS network
Simon D. P. Williams, Pascal Willis
Journal of Geodesy, 2006 - Plate kinematics of Nubia - Somalia using a combined DORIS and GPS solution
J. -M. Nocquet, P. Willis, S. Garcia
Journal of Geodesy, 2006 - DORIS: From orbit determination for altimeter missions to geodesy
Pascal Willis, Christian Jayles, Yoaz Bar-Sever
Comptes Rendus Geoscience, 2006 - The International DORIS Service: Genesis and early achievements
G. Tavernier, H. Fagard, M. Feissel-Vernier, K. Le Bail, F. Lemoine, C. Noll, R. Noomen, J. C. Ries, L. Soudarin, J. J. Valette, P. Willis
Journal of Geodesy, 2006 - Global geodetic observing system - Considerations for the geodetic network infrastructure
Geomatica, 2006 - Systematic errors in the Z-geocenter derived using satellite tracking data: A case study from SPOT-4 DORIS data in 1998
P. Willis, J. -P. Berthias, Y. E. Bar-Server
Journal of Geodesy, 2006 - Multi-technique comparison of tropospheric zenith delays derived during the CONT02 campaign
K. Snajdrova, J. Boehm, P. Willis, R. Haas, H. Schuh
Journal of Geodesy, 2006 - Plate motion of India and interseismic strain in the Nepal himalaya from GPS and DORIS measurements
Pierre Bettinelli, Jean-Philippe Avouac, Mireille Flouzat, François Jouanne, Laurent Bollinger, Pascal Willis, Gyani Raja Chitrakar
Journal of Geodesy, 2006 - DORIS as a potential part of a Global Geodetic Observing System
P. Willis, Y.E. Bar-Sever, G. Tavernier
Journal of Geodynamics, 2005 - Terrestrial reference frame requirements within GGOS perspective
Z. Altamimi, C. Boucher, P. Willis
Journal of Geodynamics, 2005 - Defining a DORIS core network for Jason-1 precise orbit determination based on ITRF2000: Methods and realization
P. Willis, J. C. Ries
Journal of Geodesy, 2005 - Geodetic applications of the DORIS system at the French 'Institut géographique national'
Pascal Willis, Claude Boucher, Hervé Fagard, Zuheir Altamimi
Comptes Rendus Geoscience, 2005 - Terrestrial reference frame effects on global sea level rise determination from TOPEX/Poseidon altimetric data
L. Morel, P. Willis
Advances in Space Research, 2005 - DORIS satellite antenna maps derived from long-term residuals time series
P. Willis, S.D. Desai, W.I. Bertiger, B.J. Haines, A. Auriol
Advances in Space Research, 2005 - Effects of thermosphere total density perturbations on LEO orbits during severe geomagnetic conditions (Oct-Nov 2003) using DORIS and SLR data
P. Willis, F. Deleflie, F. Barlier, Y.E. Bar-Sever, L.J. Romans
Advances in Space Research, 2005 - The proposed international DORIS service
Pascal Willis, Gilles Tavernier, Martine Feissel-Vernier, Frank Lemoine, Carey Noll, John Ries, Laurent Soudarin
International Association of Geodesy Symposia, 2005 - The International DORIS Service
G. Tavernier, H. Fagard, M. Feissel-Vernier, F. Lemoine, C. Noll, J. Ries, L. Soudarin, P. Willis
Advances in Space Research, 2005 - External validation of the GRACE GGM01C gravity field using GPS and DORIS positioning results
Pascal Willis, Michael B. Heflin
Geophysical Research Letters, 2004 - Behavior of the DORIS/Jason oscillator over the South Atlantic Anomaly
Pascal Willis, Bruce Haines, Jean-Paul Berthias, Pierre Sengenes, Jean-Louis Le Mouël
Comptes Rendus Geoscience, 2004 - One-centimeter orbit determination for Jason-1: New GPS-based strategies
BRUCE HAINES, YOAZ BAR-SEVER, WILLY BERTIGER, SHAILEN DESAI, PASCAL WILLIS
Marine Geodesy, 2004 - Initial orbit determination results for jason-1: Towards a 1 cm orbit
BRUCE HAINES, WILLY BERTIGER, SHAILEN DESAI, DA KUANG, TIM MUNSON, LARRY YOUNG, PASCAL WILLIS
Navigation Journal of the Institute of Navigation, 2003 - Topex/Jason combined GPS/doris orbit determination in the tandem phase
P Willis, B Haines, Y Bar-Sever, W Bertiger, R Muellerschoen, D Kuang, S Desai
Advances in Space Research, 2003 - Parameter sensitivity of TOPEX orbit and derived mean sea level to DORIS stations coordinates
L. Morel, P. Willis
Advances in Space Research, 2002 - Current status of the DORIS Pilot Experiment and the future International DORIS Service
G. Tavernier, L. Soudarin, K. Larson, C. Noll, J. Ries, P. Willis
Advances in Space Research, 2002 - Potential Interests of the IGS for the Galileo System
Pascal Willis, John M. Dow
GPS Solutions, 2001 - IGEX-98: International GLONASS Experiment
Pascal Willis
GPS Solutions, 1999 - IGEX: International GLONASS experiment - Scientific objectives and preparation
P. Willis, G. Beutler, W. Gurtner, G. Hein, R.E. Neilan, C. Noll, J. Slater
Advances in Space Research, 1999 - Foreword - Avant-Propos
Pascal Willis
Journal of Geodesy, 1996 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1995 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1995 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1994 - Processing DORIS data with the GIPSY/OASIS II software: recent results for point positioning and orbit determination
Proceedings of the National Technical Meeting Institute of Navigation, 1994 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1994 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1994 - First assessment of GPS‐based reduced dynamic orbit determination on TOPEX/Poseidon
T. P. Yunck, W. I. Bertiger, S. C. Wu, Y. E. Bar‐Sever, E. J. Christensen, B. J. Haines, S. M. Lichten, R. J. Muellerschoen, Y. Vigue, P. Willis
Geophysical Research Letters, 1994 - GPS precise tracking of TOPEX/POSEIDON: results and implications
W. I. Bertiger, Y. E. Bar‐Sever, E. J. Christensen, E. S. Davis, J. R. Guinn, B. J. Haines, R. W. Ibanez‐Meier, J. R. Jee, S. M. Lichten, W. G. Melbourne, R. J. Muellerschoen, T. N. Munson, Y. Vigue, S. C. Wu, T. P. Yunck, B. E. Schutz, P. A. M. Abusali, H. J. Rim, M. M. Watkins, P. Willis
Journal of Geophysical Research, 1994 - Early results from the TOPEX/POSEIDON GPS precise orbit determination demonstration
Advances in the Astronautical Sciences, 1993 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1993 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1993 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1992 - IAG Newsletter
Pascal Willis
Bulletin Geodesique, 1991
