Identification via orthogonality for a class of hyperbolic distributed parameter processes

Hyperbolic or wave like distributed parameter processes occur in a number of physical settings. Several identification techniques are discussed in this paper which are based on orthogonality relationships of these hyperbolic processes in the time variable, and on characteristic theory, respectively. The paper discusses and interprets the parameter identification process, its measurement requirements, and examples of both identifiable and non-identifiable processes.