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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