A fault tolerant sensor scheme

Multi-sensor systems pose the problem of how to coherently and efficiently treat the data provided by the various sensors. However. the availability of greater numbers of sensors also broadens the ability to build fault tolerant sensor systems. We define a framework in which sensors can be abstractly defined in terms of computational processes operating on the output from other sensors. Such processes are called logical sensors. Logical sensors make sensor configuration and integration easier and facilitate reconfiguration of senor systems to that fault tolerance can be both expressed and achieved.