Patrizia Tavella
holds a degree in Physics and Ph.D. in Metrology, she is now senior scientist with the Italian Metrology Institute, Torino, Italy. Her main interests are mathematical and statistical models mostly applied to atomic time scale algorithms. She is currently involved in the development of the European Navigation System Galileo. She collaborates with the Bureau International des Poids et Mesures, and she chairs the working groups on "International Atomic Time" and "Algorithms" of the Consultative Committee of Time and Frequency.
Lecture: Clocks in Satellite Navigation
In navigation systems time or frequency measurements often play a fundamental role and the navigation solution is highly affected by clock errors. In GNSS, space clocks are used for the onboard time tagging, for the pseudorange measures, and for the navigation solution. Ground clocks allow the orbit determinations, often define the system time scale and its relationship with the international time reference called the Universal Coordinated Time. The clock characteristics and their role is evaluated also with reference to the special cases of the GPS and Galileo systems.