An internet DGPS service for precise outdoor navigation

The goal o f the work presented in this paper is to provide mobile platforms within our compus with a GPS based data service capable of supporting precise outdoor navigation. This can be achieved by providing campus-wide access to real time Differential GPS (DGPS) data. As a result, we designed and implemented a three-tier distributed system that provides Internet data links between remote DGPS sources and the campus and a campus-wide DGPS data dissemination service. The Internet data link Service is a two-tier clientlserver where the server-side is connected to the DCPS station and the client-side is located at the campus. The campus-wide DGPS data provider disseminates the DGPS data received at the campus via the campus lntranet and via a wireless data link. The wireless broadcast is inlended for portable receivers equipped with a DGPS wireless interface and the lnlranet link is provided for receivers with a DCPS serial interface. The application is expected to provide adequate support for accurate outdoor campus navigation tasks.