A Modular Architecture for Navigation Applications Based on Differential GPS

Positioning systems play an important role in ubiquitous computing. There are several technologies to implement localization services, being GPS the most popular. This paper describes a modular architecture developed for sending and receiving GPS data for differential positioning. The hardware set-up for sender and receiver devices consists of an embedded PC, GPS, GSM/GPRS and WIFI modules. We proposed and evaluated three strategies that allow employing the different communication protocols for linking sender and receiver devices. The goals of our system are the modularity and portability, close to the real time, so we can use it in other applications that integrate GPS receptor or GSM/GPRS devices such as fleets control, tourism or health-care.