His major research interest is in the areas of satellite positioning and navigation, geospatial mapping and navigation using multi-sensors, 3D maps, geodesy as well as geospatial engineering. He is a Fellow of the Royal Institute of Navigation, UK, and a Fellow of the International Association of Geodesy (IAG). He is an Associate Editor of the Journal of Navigation and a member of the Editorial Board for the international journal GPS Solutions, and Journal of Global Positioning Systems. He is the Chair of IAG Sub-Commission 4.2 (2011-2015; 2015-2019) on Geospatial Mapping and Engineering Applications.