Precision positioning technology using RTK GNSS is already widely used in various fields such as geodetic, agricultural, and construction machinery, and is currently being studied in the field of autonomous driving. Correction signals are necessary for RTK GNSS positioning, and there are two types of transmission methods using satellites and an internet network. However, satellite-based methods still lack performance in terms of precision and convergence time. In the Internet-based method, the service provider incurs a traffic burden due to the increase in the number of users, and the user side incurs wireless Internet costs due to the outdoor environment. In this paper, we propose a unidirectional corrected signal transmission technique using broadcasting signals. Using the proposed method, the service provider can solve the burden of traffic increase according to the number of users and the user can solve the problem of the cost of the wireless network. And in order to verify the performance of the technology, it compares with existing methods in terms of positioning precision and convergence time. Finally, we introduce the analysis results when the proposed method is applied to urban vehicles.

Keywords: GNSS, real-time kinematic, broadcasting