Few decades ago, electronic and sensor technologies
are merged into vehicles as the Advanced Driver Assistance
System(ADAS). However, sensor-based ADASs have limitations
about weather interference and a line-of-sight nature problem. In our
project, we investigate a Relative Position based ADAS(RP-ADAS).
We divide the RP-ADAS into four main research areas: GNSS,
VANET, Security/Privacy, and Application. In this paper, we research
the GNSS technologies and determine the most appropriate one. With
the performance evaluation, we figure out that the C/A code based
GPS technologies are inappropriate for 'which lane-level' application.
However, they can be used as a 'which road-level' application.
 Basnayake, C., Kellum, C.C., Sinko, J., Strus, J.: GPS-Based Relative
Positioning Test Platform for Automotive Active Safety Systems.
Institute of Navigation ION GNSS, 2006
 Meng, X., Yang, L., Aponte, J., Hill, C., Moore, T., Dodson, A.:
Development of satellite based positioning and navigation facilities for
precise ITS applications. In: Intelligent Transportation Systems, 2008.
ITSC 2008. 11th International IEEE Conference on, pp. 962-967. IEEE ,
 Fotopoulos, G., Cannon, M.: An Overview of Multi-Reference Station
Methods for Cm-Level Positioning. GPS solutions, 4, 1-10 , 2001
 Kim, H., Son, E., Lee, H., Kim, H., Park, K.: Accuracy Analysis of
Kinematic SBAS Surveying. Korea Society of Surveying, Geodesy,
Photogrammetry, and Cartography, 26, 493-504 ,2008
 EDMap Consortium: Enhanced Digital Mapping Project. Final Report,