Cogent sensors - a generic building block for advanced sensor networks

In this paper we examine some of the concerns in the design of systems composed of very large numbers of ´intelligent sensors´. Such systems are now being proposed as a solution for a number of advanced applications for which they have some real advantages over conventional systems. Some of these proposals, and some systems which have already been built are surveyed. The problems of configuring and maintaining such networks are examined, along with the system design issues raised. The cogent sensor, a sensor endowed with the ability to transform data to information, is put forward as an essential part of realisation of the type of applications envisaged. The design of generic, cogent sensors is also problematic, because the nature of the data-information transform depends on the application. A systems architecture which overcomes this problem is outlined.