Accession Number : ADA294031

Title :   A Hierarchical Fuzzy Controller for Beam Rider Guidance with a Forbidden Zone.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Bessacini, A. F. ; Pinkos, R. F.

PDF Url : ADA294031

Report Date : 07 MAR 1995

Pagination or Media Count : 36

Abstract : Beam rider guidance is a well understood strategy wherein the goal is to maintain a vehicle on a trajectory such that its bearing and the bearing of the contact being pursued coincide. The problem of automatic, external control of an underwater vehicle such that it obeys a beam rider guidance law while remaining outside a region defined relative to a time-varying measurement is addressed herein. The approach uses fuzzy set theory to develop a hierarchical controller that deals with multiple competing goals and determines the necessary commands to be sent over a two-way communication link between the launching platform and the vehicle being guided. Control of the vehicle entails the use of a time-varying data input stream from the launching platform sensor. The controller is implemented in a simulation to demonstrate and analyze performance.

Descriptors :   *UNDERWATER VEHICLES, *FUZZY SETS, *BEAM RIDER TRAJECTORIES, DATA PROCESSING, INPUT, CONTROL, SIMULATION, MEASUREMENT, DETECTORS, TIME, VARIATIONS, PLATFORMS, COMMUNICATIONS NETWORKS, LAUNCHING, SYSTEMS APPROACH, GUIDANCE, EXTERNAL, VEHICLES, HIERARCHIES, TRAJECTORIES, SET THEORY, TWO WAY TRANSMISSION.

Subject Categories : Theoretical Mathematics
      Underwater and Marine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE