Analyzing the Time Series of Coordinates from the GNSS Station Chernihiv (CNIV)

Observations at permanent stations of the Global Navigation Satellite System (GNSS) are directly related to global and local movements of the Earth’s crust and are also affected by various factors, such as the multipath effect and radio noise in the signal. Currently, the influence of such effects can be analyzed and excluded from further processing of GNSS observations. However, there are a number of GNSS stations that deserve more attention for the monitoring of operational stability, because they define the terrestrial implementation of the reference system. The Chernihiv station (CNIV, DOMES 15501M001), which is attributed to the class A for the definition of the European Reference Frame, is an example of such a GNSS station in the territory of Ukraine. In this article, the coordinate time series based on long continuous coordinate time series and the log file of the GNSS station Chernihiv is analyzed. The coordinates of the station during the operation of various equipment are compared, and conclusions about the stability of the station are made. It was found that the station has been working stably and has not had long interruptions in observations since its commissioning. The most significant changes that occurred at the station are associated with the change of equipment. The equipment at the station was changed three times: Trimble equipment was installed in 2005, it was replaced by NovAtel equipment in 2011, and Leica equipment was installed in 2013, which is still in operation. Analysis of the time series of this permanent station shows that there is a certain jump in the study of changes in coordinates simultaneous for all devices when the Leica equipment was installed, which is associated with the change of equipment, namely with a different system of mounting the antenna on the pole. However, in the study of coordinate residuals separately for each equipment, fluctuations in values in winter and summer are observed, which can be related to the structural deformation of the GNSS antenna.