Sciences and Exploration Directorate

Oscar L Colombo


Org Code: 61A

Mail Code: 61A
Greenbelt, MD 20771


Brief Bio

Bachellor degree in Telecommunications Engineering, Natiopnal University of La pLata, Argentina. PhD in Electrical Engineering from the University of New South Wales, Australia,. Has worked since with NASA and Universities in Europe on gravity field modeling and precise positioning with GPS and similr GNSS systems, including precise LEO orbit determination. Also for the US Nay in new applications of GPS.


1967 - Ingeniero en Telecomunicacions, Universidad Nacional de la Plata (Argentina).
1977 - PhD (Electrical Engineering), New South Wales University (Sydney, Australia).
Thesis: On the control of discrete-time systems with constrained input and state variables.

Current Projects

Possible use of constellation of cubesats to monitor and issue warnings of tsunami in progress with GNSS reflectometry and analysis of ionospheric perturbations caused by upward travelling pressure waves generareted by tsunami.

Remote Sensing

As indicated in the title. Also looking for possible secondary use of cubesat constellation to monitor climate change through observation of the tropospheric water vapor content and the ionosphere using the same =data for detecting tsunami.


Senior Scientist (Consultant)

SSAI subcontractor - Goddard SFC

2021 - Present

Consultant on satellite navigation and advanced new projects.

Professional Societies

Institute of Navigation.

2011 - Present

International Association of Geodesy.


1990 - Present



Colombo, O., S. Brunker, G. Jones, V. Janssen, and C. Rizos. 2010. Sparse Network: Wide-area, Sub-decimeter Positioning for Airborne LiDAR Surveys GPS World 21 (10): 44-50

Fujita, M., T. Ishikawa, M. Mochizuki, et al. M. Sato, S. Toyama, M. Katayama, K. Kawai, Y. Matsumoto, T. Yabuki, A. Asada, and O. L. Colombo. 2006. GPS/Acoustic Seafloor Geodetic Observation: Method of Data Analysis and its Application Earth Planets Space 58 265-275

Hernandez-Pajares, M., J. M. Juan, J. Sanz, O. L. Colombo, and H. van der Marel. 2001. A New Strategy for Real-Time Integrated Water Vapor Determination in WADGPS Networks Geophysical Research Letters 28 17 [3267-3270]

Hernandez-Pajares, M., J. M. Juan, J. Sanz, and O. L. Colombo. 2000. Application of Ionospheric Tomography to Real-Time GPS CarrierPhase Ambiguities Resolution, at Scales of 400-1000 km and With High Geomagnetic Activity Geophysical Research Letters 27 13 [2009-2012]


Colombo, O. L., S. Brunker, G. Jones, and V. Janssen. 2010. Wide-area, Sub-decimetre Positioning for Airborne LiDAR Surveys Using CORSnet-NSW

Colombo, O. L. 2009. Shortening the Convergence Time of Wide-Area Real-Time Kinematic Solutions

Colombo, O. L. 2008. Real-Time, Wide-Area, Precise Kinematic Positioning Using Data from Internet NTRIP Streams Proceedings ION GNSS

Colombo, O. L. 2006. A Zenith Delay Model for Precise Kinematic Aircraft Navigation Proceedings of the ION GNSS-2006

Colombo, O. L., M. Hernandez-Pajares, M. Juan, and J. Sanz. 2005. Extending Wide Area and Virtual Reference Station Networks Far Into the Sea With GPS Buoys Proceedings of the ION GNSS-2005

Colombo, O. L., A. W. Sutter, and A. G. Evans. 2004. Evaluation of Precise, Kinematic GPS Point Positioning Proceedings ION GNSS-2004

Colombo, O. L., A. W. Sutter, and A. G. Evans. 2003. Evaluation of Real-Time, Long-Range, Precise, Differential, Kinematic GPS Using Broadcast Orbits, Proceedings ION GNSS-2003

Colombo, O. L., M. Hernandez-Pajares, J. M. Juan, and J. Sanz. 2002. Carrier-Phase Ambiguity Resolution Using a Tomographic Model of the Ionosphere Wide-Area, "Navigation" 41 (1):

Colombo, O. L., A. G. Evans, M. Ando, et al. K. Tadokoro, K. Sato, and T. Yamada. 2001. Speeding up the estimation of floated ambiguities for sub-decimeter kinematic positioning at sea Proceedings ION GPS-2001

Colombo, O. L., A. G. Evans, M. I. Vigo-Aguiar, J. M. Ferrandiz, and J. J. Benjamin. 2000. Long-Baseline (> 1000 km), Sub-Decimeter Kinematic Positioning of Buoys at Sea, with Potential Application to Deep-Sea Studies Proceedings of the ION GPS-2000 Symposium

Colombo, O. L., M. Hernandez-Pajares, J. M. Juan, and J. Sanz. 1999. Resolving Carrier-Phase Ambiguities On The Fly, At More Than 100 km From Nearest Reference Site, With The Help Of Ionospheric Tomography Proceedings of the ION GPS-99 Symposium

Colombo, O. L., and A. G. Evans. 1998. Sea and Land Tests of Long-Baseline Kinematic GPS Indicate SubDecimeter Level Precision Proceedings of the INSMAP-98 Symposium