Abstract. LitPOS (Lithuanian Positioning System), the network of permanent reference GNSS stations, became operational in July 2007. It provides data both for real-time and post-processing applications. LitPOS stations cover the whole territory of Lithuania. Total number of GNSS stations is 25, therefore the integration of some stations of neighbouring countries is foreseen. It is possible on the basis of cooperation in EUPOS® project. The European Position Determination System (EUPOS®) project is an initiative and cooperation of currently 15 Central and Eastern European countries (CEE) and two German states that build up a ground-based European regional GNSS augmentation system with uniform standards that will cover a territory of about 10 million square kilometers. EUPOS® provides a high-quality differential GNSS information for high-precision positioning and navigation usable in a large field of applications. To enlarge the EUPOS® activities transcending technical realizations the project EUPOS® -Interregional Cooperation (EUPOS®-IRC) was launched on October 2006; since it is accepted as a European Union INTERREG IIIC Programme operation. Main aims of this operation are to identify, point out and enable possibilities and benefits of the use and application of GNSS technology in the field of regional development, to establish a long-lasting cross-border cooperation between experts in the field of GNSS and geoinformation, on the one hand, and regional policy experts and stakeholders, on the other hand.
Lithuania has been participating in the activities of the EUREF permanent network since 1996, when GPS station VILNIUS started regular continuous tracking of GPS satellites. The GPS station was established with a help of the Onsala Space Observatory (Sweden) and was mounted in the territory of Vilnius international airport (Lithuania). Four character identifier VLNS and DOMES number 10801M001 were assigned to VILNIUS GPS station by the International Earth Rotation Service in 1999. VILNIUS station is operated and maintained by the Institute of Geodesy of Vilnius Technical University. The main task of the permanent VLNS GPS station is to take part in EUREF activities and serve as reference to GPS campaigns in Lithuania. The aim of this paper is to describe the evolution and current status of the technical equipment of VILNIUS station. The paper also presents the analysis of data quality and a few years interval of coordinate determination at VLNS within the EUREF network. Santrauka EUREF nuolat veikiančių stočių tinklo veikloje Lietuva dalyvauja nuo 1996 m., kai GPS VILNIAUS stotis pradėjo reguliarius matavimus iš GPS palydovų. Stotis įsteigta padedant Onsalos kosmoso observatorijai (Švedija). GPS stotis įrengta Vilniaus tarptautinio oro uosto teritorijoje 1999 metais. Tarptautinė žemės sukimositarnyba stočiai suteikė keturių simbolių identifikatorių VLNS ir DOMES numerį 10801M001. GPS VILNIAUS stotį prižiūri ir valdo Vilniaus Gedimino technikos universiteto Geodezijos instituto specialistai. Pagrindinis stoties uždavinys yra dalyvauti EUREF veikloje, ir tai turi būti atraminis geodezinis punktas GPS kampanijoms Lietuvoje. Straipsnio tikslas – aprašyti dabartinę techninės įrangos būklę ir jos tobulinimo eigą. Pateikiama kelerių metų matavimo duomenų kokybės analizė ir nustatytos koordinatės EUREF tinkle. Резюме В проекте сети постоянно действующих станций ГПС EUREF Литва участвует с 1996 г., когда станция VILNIUS стала производить постоянные измерения со спутников ГПС. Станция была основана при помощи Онсольской космической oбсерватории (Швеция). Станция ГПС установлена на территории Вильнюсского международного аэропорта. В 1999 г. Международная служба вращения Земли присвоила станции код VLNS и DOMES номер 10801М001. Станцией управляют специалисты из Геодезического института Вильнюсского технического университета им. Гедиминаса. Главной задачей станции является участие в мероприятиях EUREF, а также быть основным геодезическим пунктом в кампаниях ГПС на территории Литвы. В статье преследовалась цель описать состояние технического оборудования станции и меры по его улучшению. Представлен анализ данных измерений ГПС за несколько лет и определены геодезические координаты в сети EUREF.
Kyviskes Calibration Baseline is the longest calibration baseline in the Lithuania. Kyviskes Calibration Baseline was established by the Institute of Geodesy, VGTU in 1996 for the calibration of EDM instruments. Finnish Geodetic Institute together with Institute of Geodesy, VGTU are measuring Kyviskes Calibration Baseline regularly. The same Kern Mekometer ME5000 EDM instrument was used for all measurements performed. The Kyviskes baseline was converted to a triangle-shaped test field in year 2000, and three cycles of remeasurements were made in 2001, 2007 and 2008. Analysis of baseline calibration results of the baseline is performed and presented. The results of the baseline length are air temperature correlated. Possible reason for this are analyzed. Kyviskes Calibration Baseline became a test field for the different purposes after building seventh observation pillar. Kyviskes Calibration Baseline is the length standard for Lithuania and is used by Calibration laboratory regularly. The results confirm the good stability of the baseline, which is now used for calibration of EDM instruments and testing of total stations and GNSS measurement equipment.
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