Accuracy analysis of time and frequency transfer based on precise point positioning

A time and frequency transfer experiment based on the precise point positioning (PPP) technique was carried out using IGS 5 min and 30 s interval precise satellite clock products. The results demonstrate that the precision of time transfer based on PPP technique is up to 0.1~0.2 nanosecond and a frequency stability of 1x10(-15)~2x10(-15)is derived for averaging times of half-day, whether using IGS 5 min or 30 s interval precise satellite clock products. The results also indicate that whereas by using 30 s interval precise satellite clock products we could get a clearly improved frequency stability over that derived by using a 5 min interval precise satellite clock products in the short term. There is no significant improvement in the long term.