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Tech Briefs









                                                                                          the system architec-
                                                                                          ture domain.
                                                                                           The system analysis
                                                   GPS                                    domain consists of the
                                                                                          following stages: Model
                                                                                          Definition (Stage Four)
                                                                                          and Model Analysis
                                                               The Impossible City
                                                               The Impossible City
                                                               The Impossible City        (Stage Five). Within the
                                                                                          system analysis do-
                            UAV                                                           main, a model for the
                                                                                          system is constructed
                                                                                          and then analyzed, re-
                                                                                          sulting in the assess-
        Command & Control              UGV                                 LEGEND         ments of technical fea-
                                                                                          sibility and operational
                             Wireless
                             Comms                                                        effectiveness of the sys-
                                                                              Onboard Sensors
                                                                                          tem being highlighted.
                                                                                           The model definition
                                                                                          (Stage Four) was a vali-
                                                                           Wireless Communications
                                                                                          dation exercise which
                                                                                          consisted of the un-
                                                                              GPS link    manned vehicles con-
                                                                                          ducting a collabora-
       High-Level Operational Concept Graphic depicting the environment in which a UAV and UGV could be operating.   tive task of HA/DR. In
                                                                                          this study, the original
       tasks necessary to find a person in dis-  The requirements of the system de-  com puter-based modeling of Stage Four
       tress (PID).                       fined the functions of the system,   was replaced with a validation exercise.
         The MBSE MEASA is a methodology   which led to the development of the   The cross-domain vehicles worked to-
       that integrates system architecture and   functional architecture (Stage Two).   gether autonomously to identify, locate,
       the system analysis domains and main-  The top-level functions of the cross-  and provide assistance to a PID. Both
       tains traceability, both forwards and   domain collaborative system was   unmanned vehicles used their onboard
       backwards, from the system require-  sense, navigate, communicate, and   sensors to navigate and locate the PID
       ments to the system performance re-  move and control. The unmanned ve-  in a post- disaster environment. Stage
       sults. The MBSE MEASA is a five-stage   hicles must have the capability to   Four provided the traceability of the
       process that identifies the connection   navigate the area of operation au-  system’s architecture to the system’s
       between the system’s architecture and   tonomously in order to search the en-  analysis.
       the system’s analysis.             vironment and locate the PID. The   After the validation exercise was ex-
         The system architecture domain   functional architectures identified all   ecuted, the system’s architecture and
       composition consists of the following   the system’s functions and how the   requirements were analyzed (Stage
       stages: Requirement Analysis (Stage   function will operate together in   Five). The functions and physical com-
       One), Functional Architecture (Stage   order to meet the system’s require-  ponents were analyzed to ensure the
       Two), and Physical Architecture (Stage   ments. Once the system’s functions   operational activities of the system
       Three).                            were clearly stated, the physical com-  were efficiently met. This qualitative
         The requirement analysis (Stage   ponents capable of executing such   analysis resulted in a refined func-
       One) defined what conditions must be   tasks were generated.          tional and physical architecture being
       met in order to deem the system oper-  The physical architecture (Stage   generated. It also produced specified
       ational. The system requirements for   Three) identifies the physical elements   operational requirements that enabled
       conducting humanitarian assistance   of the system that will conduct the   the system with better capabilities
       and disaster relief (HA/DR) were deter-  functions depicted in the functional   than before.
       mined by the Chief of Naval Opera-  architecture. The physical compo-  This work was done by Wyatt T. Middle-
       tions instruction (OPNAV) 3500.38B.   nents of this system consisted of one   ton for the Naval Postgraduate School. For
       This instruction served as the stake-  unmanned ground vehicle (UGV) and   more information, download the Tech-
       holder inputs and provided the condi-  one unmanned aerial vehicle (UAV).   nical Support Package (free white
       tions of how the system must operate   The UGV and UAV were equipped   paper) at www.aerodefensetech.com/tsp
       in order to comply with international   with sensors capable of performing the   under the Machinery & Automation
       and civil laws pertaining to humanitar-  functions listed in the functional ar-  category. NPS-0009
       ian assistance.                    chitecture. These three stages make up

       26                                                                                          www.aerodefensetech.com                     Aerospace & Defense Technology, May 2020
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