Study of the Performance of Aids to Navigation Systems-Phase I. A Control Theory Approach.
Final rept. 30 Sep 77-29 Mar 78,
SCIENCE APPLICATIONS INC MCLEAN VA
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A preliminary methodology for the design and evaluation of systems of aids to navigation in pilot waters is described. The physics of ship maneuvering capability are derived from a hydrodynamic vessel response model. Harbor or waterway segments are characterized by generic scenarios involving a single navigation task. Scenarios are adapted to a real harbor segment by the input of actual dimensions. Any system of aids to navigation may be overlaid. The information derived from the aids to navigation by the mariner is determined through the application of statistical distributions for the psychophysical tasks performed. The psychophysical tasks were identified through theoretical analysis and through formalized interviews with pilots. Data on performance of those tasks were derived from prior work in analogous areas and from a limited amount of experimentation. A model integrates both instantaneous and accumulated estimates of components of position and motion pertinent to the scenario. The model output includes measures of risksafety. The future effort required to expand and refine the methodology, and to produce an integrated, automated and valid model is described. Appendices describe the human factors analysis and the mathematical development of the model in detail. Author
- Navigation and Guidance