This paper describes the conceptual design and the implementation of the project of establishing a GNSS control network in the territory of the Republic of Slovenia, which will be used to monitor the quality of the SIGNAL network products and services and to verify the quality of methods and measurement equipment for GNSS positioning. The stabilization process and the selection of locations of GNSS points are described. The determination of the reference coordinates of GNSS points is presented. A comparison of coordinates of the GNSS points in the coordinate reference systems D96/TM and D96-17/TM is made. A comparison of coordinates determined from 24-hour static measurements is also made, by using baselines 1) to the nearest SIGNAL stations and 2) to a virtual reference station (VRS) in the immediate neighbourhood of each point.

Key words: accuracy, control network, control point, static GNSS measurement, post-processing VRS