On Friday, April 28, 2017 at 12:06:57 PM UTC-4, wrote:
... rerephrasing the last question : is Cassini having a Dppler shift like Pioneer , and yearly and dayly ?

It's an interesting question. No effect similar to the Pioneer anomaly has been detected with the Cassini doppler data. Cassini is indeed a more complicated spacecraft, and there are more trajectory disturbances for Cassini than for Pioneer. The very detailed PhD work of Benedetto was able to rule out a Pioneer-like anomaly using the full Cassini data set.

CM