Peter Teunissen

Peter J. G. Teunissen (born 9 October 1957) is a Dutch geodesist, known for his contributions to satellite navigation and Earth observation.

He would be recognized for inventing the LAMBDA (Least-squares AMBiguity Decorrelation Adjustment) method, which has become the standard technique for solving integer ambiguities in GNSS carrier‑phase measurements.

Early life and education Teunissen was born in Owerri, Nigeria, on 9 October 1957. He earned his BSc (1978), MSc (1980, cum laude), and PhD (1985, cum laude) in Mathematical and Physical Geodesy from Delft University of Technology.

Academic career Teunissen has held several academic and leadership positions at Delft University of Technology (TU Delft), including Head of the Department of Geodesy, Vice-Dean of the Faculty of Civil Engineering and Geosciences, and Director of Education.

He has also served as Distinguished Visiting Chair Professor at Hong Kong Polytechnic University. a key development in GNSS positioning. His research focuses on satellite navigation, mixed-integer estimation, quality control, and precise positioning with multi-GNSS constellations, including GPS, GLONASS, Galileo, BeiDou, and IRNSS. (with A. Kleusberg) Adjustment Theory and Testing Theory Springer Handbook of Global Navigation Satellite Systems (with O. Montenbruck)

Awards and honours Teunissen has received multiple international awards, including:

Vening Meinesz Medal, European Geosciences Union (2022) Johannes Kepler Award, Institute of Navigation (2019) Honorary Fellow, International Union of Geodesy and Geophysics (IUGG, 2023) Fellow, Institute of Navigation (2014) Fellow, Royal Institute of Navigation (2016) Teunissen, P.J.G. & Montenbruck, O. (Eds.), Springer Handbook of Global Navigation Satellite Systems, Springer. Multiple journal articles on GNSS ambiguity resolution, integer estimation, and geodetic theory.