Tereshchuk Oleksii, Chernihiv National University of Technology (95 Shevchenka Str., 14027 Chernihiv, Ukraine)

Language: ukrainian


Urgency of the research. Training geodesic polygons were created several decades ago to ensure practical training of students, scientific researches and consistent with its purpose. However, after starting the use of modern GNSS receivers and electronic tacheometers the need for modernization of geodetic networks of the mentioned landfills became apparent.

Target setting. At the present stage of development of satellite technologies of coordinate ensuring more attention is paid to the achievement of high accuracy of observations. This is especially true for GNSS-observations of teaching points and geodetic polygons, which were created by up to that time surveying technology decades ago.

Actual scientific researches and issues analysis. Training geodesic polygons were created on the bases of educational institutions that had the appropriate licensed areas of training students of geodesy, land management, construction, architecture etc. The size and shape of mentioned polygons depends on many factors, but primarily on the ability of the institution and the prospects of its development, the licensed number of students of these training areas etc. Thus, in 1974 a framework of educational and geodesic polygon "Lviv Polytechnic" was created, which was extremely well placed on the picturesque slopes along Berezhansky pond and covers an area of 9 hectares. Berezhansky geodesic polygon includes more than a hundred items which have been longer used in educational and scientific purposes and fully consistent with its purpose. However, using modern GNSS-receivers, total stations and electronic acute requires modernization of the geodetic network. Satellite observations in geodetic network landfill complied with for 1999-2008 years various devices and different duration. Similar polygons using satellite technology were established in different places and had a goal and metrological certification of GPS-equipment [1, 2].

Uninvestigated parts of general matters defining. Since the creation of the network of the training and geodesic landfill of the ChNTU, there have been no repeated geodetic observations at the landfill. Taking into account this and in order to modernize the existing geodetic network, we carried out repeated measurements and GNSS observation at the points of the planned high-altitude network of the training and geodesic landfill of the ChNTU "Fortuna". Since the network points are located in the forested area, particular attention was paid to the application and research of satellite technologies in the mode of real-time kinematics.

The research objective. The main aim of this work was supposed to modernize the existing network of educational and geodesic polygon of Chernihiv National Technological University in way by laying polygonometry and implement modern methods of satellite observations in real-time kinematics mode.

The statement of basic materials. The uniqueness of the location of a geodetic polygon on the territory of the historic reserve tract of about Svyatogo Island provided additional conditions for the development of a program of observations, namely, in the absence of the possibility of restoring the visibility between adjacent points of the network compensated by the laying of additional points. Observations at the points of the landfill were conducted in real time with the GNSS-receiver. All coordinate calculations were performed in the GeoMax X-PAD software. The polygon network was evaluated using the CREDO DAT 3.10 software. The determination of the coordinates of the points was also carried out by laying the tacheometric moves, in the course of which the relative error of the planned position corresponds to the accuracy of grade 4 polygonomy. The results of the accuracy of the coordinates obtained by us in the RTK-mode according to the criteria of the closure coefficient of the horizon are also analyzed.

Conclusions. For these conditions, observation points geodesic polygon with a unique location on the reserve in the forested areas make better use of classical methods such as coordinate software, providing accurate and reliable results. The accuracy of observations in RTK - mode in these conditions is lower.

Key words:

polygons, GNSS-technology, tacheometric moves


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