This paper presents a real time pedestrian navigation system that combines different type of GPS receivers (namely High Sensitivity GPS and Assisted GPS) with several low-cost inertial sensors to face GPS outages and provide a reliable and continuous position solution. The off-the-shelf inertial module from Xsens is made of several low-cost MEMS type sensors contained in a very small package (5...

Managing scientiic data is a challenging task, and many of the problems it presents have yet to be adequately solved. The Real-time Environmental Information Network and Analysis System (REINAS) is an attempt to develop an operational solution to the problem of collecting and distributing environmental data in a real-time context, as well as supporting data acquisition, veriication, retrieval, ...

We report the results of a survey about the software faults encountered during the testing phases in evolving a large real-time system. The survey was done in two parts: the first part surveyed all the faults that were reported and characterized them in terms of general categories of faults; the second part surveyed in depth the faults found in the design and coding phases. For the first part, ...

Managing scientiic data is a challenging task, and many of the problems it presents have yet to be adequately solved. The Real-time Environmental Information Network and Analysis System (REINAS) is an attempt to develop an operational solution to the problem of collecting and distributing environmental data in a real-time context, as well as supporting data acquisition, veriication, retrieval, ...

In a distributed environment, tasks often have processing demands on multiple di erent sites. A distributed task is usually divided up into several subtasks, each one to be executed at some site in order. In a real-time system, an overall deadline is usually speci ed by an application designer indicating when a distributed task is to be nished. However, the problem of how a global deadline is a...

This paper focuses on the problem of providing run-time support to real-time applications and non-real-time applications in an open system. It describes a two-level hierarchical priority-driven scheme for scheduling independently developed applications. The scheme allows the developer of each real-time application to validate the schedulability of the application independently of other applicat...

Traditional reliability measures for computer systems can be classi ed into Computer-Centric or Application-Centric categories. The former concentrate on the hardware resources while ignoring the application's needs. The latter focus on the requirements of a speci c application which is being executed, thus requiring the knowledge of all the details of the application; information which may not...

Traditional Real-Time Operating Systems (RTOS) are not designed to accommodate application specific requirements. They address a general case and the application must co-exist with any limitations imposed by such design. For modern real-time applications this limits the quality of services offered to the end-user. Research in this field has shown that it is possible to develop dynamic systems w...

The drive towards standardization in the automotive sector puts a lot of pressure on software suppliers to comply with standards such as OSEK and AUTOSAR. However, many of these suppliers have a vested interest in proprietary software and are seeking ways to migrate their existing code-base to comply to these standards. This paper reports on a feasibility study to wrap a proprietary real-time o...