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In this paper we discuss possible applications and design considerations for an Occupant Position Sensing System (OPSS). First, the minimum functional requirements and possible advanced applications for an OPSS are presented. The relation of an OPSS to current and future deployment decision systems is discussed. We then consider the implications of the functional requirements for the choice of technology. Finally, we describe a prototype occupant position sensor, and display its position and motion tracking capability.

New sensor approaches termed magnetostrictive sensor (MsS) and nonlinear harmonics (NLH) for vehicle safety applications such as crash detection and occupant seat weight sensing are described. Both sensor approaches utilize the changes in the magnetic properties of ferromagnetic materials that occur when a stress (or a strain) is applied to the material. The MsS is a passive device suitable for vehicle crash sensing. The NLH is an active device suitable for occupant seat weight sensing. Technical features of these sensors are also discussed together with preliminary results of ongoing testing.

An occupant detection system must employ advanced signal processing techniques if it is to work throughout a full range of environmental variations, and make use of all potentially relevant information. This review begins with a discussion of the kinds of signals that one expects from an occupant position sensor described in [1]. Potential noise sources are then examined. The kinds of information that can be extracted from those signals are described. Finally, an example of the application of signal processing techniques to a complex problem is presented.