/> Among other innovations, van Diggelen pioneered important mathematical techniques to address the problem of computing a position using measurements obtained prior to achieving bit or frame synchronization. In related research, van Diggelen developed algorithms to resolve the millisecond ambiguities that arise when working with sub-millisecond pseudo-ranges.

Dr. van Diggelen was part of a team that created the concept of extended ephemeris assistance data, which the group called Long Term Orbit (LTO) data. This innovation built on earlier concepts for A-GPS by allowing assistance data to be valid for periods much longer than broadcast ephemeris. To facilitate the creation of LTO and other assistance data, van Diggelen was instrumental in the creation of a worldwide network of reference stations -- the first and only network of its kind dedicated to A-GPS applications.

Dr. van Diggelen's work has had a great impact on commercial GNSS applications especially in the adoption of GPS as a mainstream technology for mobile telephones. His techniques have paved the way for time-to-fix reductions down to one second; for both position computations in extremely low signal environments and for the extension of A-GPS in situations where a reliable initial position is not available. His innovations in extended ephemeris allowed A-GPS techniques to be applied in smart phones and navigation devices (which may not always have access to a network connection) for obtaining real-time assisted data.

Dr. van Diggelen is sole- or co-inventor for over 50 issued U.S. patents and the author of the bestselling textbook A-GPS: Assisted GPS, GNSS, and SBAS (Artech House, Boston & London 2009). He is a frequent speaker at the ION conference and other navigation industry conferences, and is a consulting assistant professor at Stanford University where he teaches a class on GPS. He received his Ph.D degree in electrical engineering from Cambridge University.