EDUCO is a system for collaborative learning that uses real-time direct social navigation. Social navigation means making the navigation of other users visible to everyone else in the system. The paper discusses the social navigation features of EDUCO and reports empirical results regarding the collaborative behaviour of the students in a university-level Web-course. Contrary to our research hy...

The European Tripartite Group composed of ESA, the European Commission and EUROCONTROL is implementing, through the EGNOS project, the European contribution to the Global Navigation Satellite System (GNSS-1). EGNOS, aimed at augmenting GPS and Glonass navigation, will provide and guarantee navigation signals for aeronautical, maritime and land mobile TransEuropean network applications. ESA is r...

High sensitivity receiver technology is necessary to ensure sufficient observation availability of satellite navigation in degraded signal environments. However, high sensitivity processing in the deteriorated line-of-sight conditions is susceptible to bringing about severely erroneous navigation observations. Therefore, when using a satellite navigation system, such as the Global Positioning S...

This study attempts to demonstrate the impact of pedestrian navigation aids on spatial knowledge acquisition and its link to walkability in an urban environment. Spatial knowledge is important for pedestrian travel. Rich spatial knowledge contributes to a good mental image of the walking environment, which consequently increases travel confidence and potentially allows more active walking. Whil...

Future satellite navigation systems (like Galileo) intend to provide safety-of-life services, or at least a form of integrity information. Integrity is characterized by the Probability of Hazardously Misleading Information, which is the probability that a user might exceed a certain error level (either fixed are variable). This definition, however, is incomplete, as it does not specify what is ...

The emerging European global satellite system Galileo has gained much public interest regarding location and position services. Two Galileo Open Service signals, namely E1 and E5, will provide the frequency diversity. The dualfrequency receiver will greatly enhance the performance of satellite navigation. However, the dual-frequency receiver becomes more complex since it needs to process two si...