Performance of GPS on board clocks computed by IGS

This paper presents the performances of GPS on board clocks computed by the International GPS Service (IGS). Using recently developed IGS combined clock products referenced to IGST, the identified GPS on board clocks have no longer day boundaries discontinuities, allowing extensive analysis on large integration times. The aim of this paper is to compare the performances of GPS on board clocks of each Block (Caesium and Rubidium clocks of Block II/IIA and Rubidium clocks of Block IIR) to the Galileo preliminary specifications.