In-Situ Referencing for Differential GPS Corrections in IVHS

Hassan Abou Ghaida, Bahram Ravani

Abstract:	This paper discusses a method for generating differential GPS corrections in IVHS (Intelligent Vehicle Highway System) applications using reference markers inserted in the roadway pavement. The method will provide automated lateral control of the Automated Highway System (AHS) vehicles. In the past, application of DGPS for lane keeping in AHS has not been practical due to the lack of existence of enough differential base stations that provide the differential correction data. In this paper, we propose providing the differential corrections from carefully surveyed roadway discrete reference markers instead of ground base stations. The proposed method, IS-DGPS (In-Situ-DGPS), uses magnetic nails, as reference markers, planted along the centerline of the highway lanes, one every 50 to 100 meters. IS-DGPS requires less roadway infrastructure than the other AHS methods, resulting in lower implementation cost. In comparison with DGPS, IS-DGPS eliminates the problematic base-rover communication link and its associated latency and line of sight requirement. Furthermore, it eliminates or greatly reduces errors due to spatial decorrelation, such as the tropospheric effect. IS-DGPS can also be used with road maintenance vehicles in rural and mountainous areas where a DGPS correction signal can not be adequately provided.
Published in:	Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998) June 1 - 3, 1998 The Adams Mark Hotel Denver, CO
Pages:	255 - 260
Cite this article:	Ghaida, Hassan Abou, Ravani, Bahram, "In-Situ Referencing for Differential GPS Corrections in IVHS," Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998), Denver, CO, June 1998, pp. 255-260.
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