Hi Tatiana,
I moved the topic to the main thread and additionally checked the ‘638’ session using GNSS Solutions, which shows extremely good accuracy. This is the rapid static method (RS). Here I think the reason is a change in the RTCM to NMEA in ‘Correction Input’ (GGA message). I will try to show it in another example.
Raport_RS_638.pdf (628.2 KB)
If we simulate in GNSS Solutions that this is a kinematic session then the program will treat the observations as Stop & Go with showing epochs as ‘float’. I enclose it, because it can be helpful. Such sessions can easily do yourself for confirmation of my suppositions.
Raport_PPK_638.pdf (401.6 KB)