Sub 10-16 frequency transfer with IPPP
July 8, 2017 • 219 Views
Workshop 2017 - Gérard Petit - The Precise Point Positioning (PPP) technique using GPS phase and code observations is widely used to compute time and frequency links. It provides typical uncertainty for frequency comparisons of order 1x10-15 at 1-day averaging and a few 10-16 at 5 to 10 day averaging. We have shown that a PPP technique where the integer nature of phase ambiguities is preserved provides significant improvement over the classical use of floating ambiguities. We show examples that all indicate that this Integer-PPP (IPPP) technique allows frequency comparisons with 1x10-16 accuracy in a few days, improving with longer averaging. It can be readily operated with existing products of the CNES/CLS analysis center of the IGS.