Abstract

Today,Global Navigation Statellite System(GNSS) technology is widely used insurveying, from the establishment of control network to collecting measurements of topographic andcadastral maps. Real-time kinematic positioning (RTK) technology is commonlyused for collecting geographical data. RTK technology using a network ofpermanent reference stations (NRTK) is being applied with many advantages suchas ensuring continuity, on a national scale and stable accuracy of centimeter.The advantages of RTK technology have been proven through research andpractical tests. However, such technology also has the problem that it can onlybe measured within the network's range, out of the region will not be possible.To overcome this problem, this paper proposes solutions for RTK measurementoutside the NRTK boundary area based on the principle of fixed VirtualReference Station. Experiments were conducted in some coastal areas of Vietnamwith the network of CORS. The results show that the proposed method overcomesthe lack of coverage of the VNGEONET network in coastal and border areas thatconventional RTK method cannot implement.