=Paper= {{Paper |id=Vol-3126/paper13 |storemode=property |title=A method for formalizing knowledge about planning UAV flight routes in conditions of uncertainty |pdfUrl=https://ceur-ws.org/Vol-3126/paper13.pdf |volume=Vol-3126 |authors=Aleksandr Tymochko,Natalia Korolyuk,Аnastasia Korolyuk,Elena Korshets }} ==A method for formalizing knowledge about planning UAV flight routes in conditions of uncertainty== https://ceur-ws.org/Vol-3126/paper13.pdf
A Method for Formalizing Knowledge About Planning UAV Flight
Routes in Conditions of Uncertainty
Aleksandr Tymochko 1, Natalia Korolyuk 2, Аnastasia Korolyuk 3 and Elena Korshets 4
1,2
   Ivan Kozhedub Kharkiv National University of the Air Force, Sumska street, 77/79, Kharkiv, 61023, Ukraine
3
  Vasil Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv, 61022, Ukraine
4
  Ivan ChernyakhovskyNational Defense University, Povitroflotskyi Avenue, 28, Kyiv 03049, Ukraine

                  Abstract
                  It is advisable to use heuristic methods for the task of planning the flight routes of unmanned
                  aerial vehicles (UAVs) at the planning stage of monitoring and reconnaissance. With their help
                  they look for solutions within some subspace of possible acceptable solutions. They are the best
                  in terms of taking into account the practice, experience, intuition, knowledge of the decision
                  maker. The values of individual predicted factors should be represented using the mathematical
                  apparatus of fuzzy sets. A method of formalizing knowledge about UAV flight route planning
                  has been developed. It is based on interval fuzzy sets. In conditions of uncertainty, they allow
                  to formalize the factors that take into account the conditions of monitoring, search, detection
                  and destruction of objects, the impact of the external environment on the range of UAVs. This
                  effect is manifested in the form of linguistic and interval-estimated parameters for each option,
                  which allow to take into account the uncertainty. The developed method allows to form the area
                  of definition of linguistic variables. These variables are used to describe the conditions for
                  monitoring, reconnaissance and the impact of the environment on the range of UAVs. Such
                  variables are also used to form from the set of the most important objects of monitoring,
                  exploration of the most significant ground objects on the basis of an assessment of the degree
                  of non-dominance of elements. The proposed approach provides a formalization of UAV flight
                  route options for each possible scenario of the location of objects, the impact of the external
                  environment. The result of formalization is fuzzy production rules, where fuzzy linguistic
                  utterances are used as the antecedent and consequent.

                  Keywords 1
                  Unmanned aerial vehicle, production rules, fuzzy linguistic statements


1. Introduction                                                                               enemy. Among the available technical means
                                                                                              capable of quickly and efficiently collecting the
                                                                                              necessary information, one can single out
    The most important task of the Armed Forces
                                                                                              unmanned aerial vehicles (UAVs). When
(AF) of Ukraine in the defense nature of military
                                                                                              monitoring the area, UAVs fly over the area of
doctrine is the constant monitoring of the enemy.
                                                                                              interest and collect the necessary data.
Monitoring should ensure a timely and organized
                                                                                                  Thus, UAVs can be used to monitor forests,
transition of troops from peacetime to martial law.
                                                                                              fields, borders, for environmental and
The main role is played by monitoring and
                                                                                              meteorological monitoring, search and rescue
intelligence. Their tasks are to provide the
                                                                                              missions, for military purposes, etc. The presence
leadership and headquarters in a timely manner
                                                                                              of large potential capabilities of UAVs does not
with complete and reliable information about the

ISIT 2021: II International Scientific and Practical Conference
«Intellectual Systems and Information Technologies», September
13–19, 2021, Odesa, Ukraine
EMAIL: timochko.alex@gmail.com (A. 1); natali-kor@ukr.net
(A. 2); nastyshakorolyk@gmail.com (A. 3) korshets_l@ukr.net
(A. 4)
ORCID: 0000-0002-4154-7876 (A. 1); 000-0002-2865-5899 (A.
2); 0000-0003-1860-6599 (A. 3); 0000-0002-7225-0848 (A. 4)
              ©️ 2021 Copyright for this paper by its authors. Use permitted under Creative
              Commons License Attribution 4.0 International (CC BY 4.0).
              CEUR Workshop Proceedings (CEUR-WS.org)
guarantee the achievement of the specified                 Global trends in research in the field of control
efficiency of reconnaissance and monitoring. Its       theory are concentrated in two areas – artificial
increase can be achieved by intelligently              intelligence and machine learning, robotics and
predicting the behavior of UAVs. This takes into       decision      theory.      Artificial    intelligence
account the influence of environmental factors,        technologies are actively used in the military
the behavioral nature of the objects of monitoring,    sphere. Work is being actively carried out to
knowledge and experience of UAV operators.             increase the autonomy of the functioning of
    The experience of practical application of         combat systems.
UAVs [1-3] in performing field monitoring tasks            The article [4] considers the principles of
in real combat conditions revealed the difficulty      construction of the distributed external and
in making an informed decision on the selection        onboard components of the control system of a
and construction of rational flight routes.            group of reconnaissance and strike unmanned
Managing UAVs for monitoring, searching,               aerial vehicles.
detecting, and destroying objects is a complex,            In [5] the models of collective control of
poorly formalized task. It is resolved under the       manned and unmanned aerial vehicles are
condition of opposition of the opposite party          presented. Methodical support of training of
(conflict) and requires the use of methods in the      aircraft control operators and engineers of air
field of artificial intelligence. First of all, it     navigation systems is offered.
concerns decision support systems, methods of              In the article [6] the analysis of an estimation
presentation and formalization of knowledge,           of efficiency and criteria of reliability of group
models of fuzzy sets.                                  flights of UAVs is carried out. The algorithm of
    At present, the combination of stochastic and      search of the central repeater of group of UAV for
non-stochastic uncertainty factors influencing this    ensuring transfer of a control signal in group is
process is insufficiently taken into account when      developed.
selecting appropriate options for the UAV flight           The article [7] discusses the advantages and
route. Factors of non-stochastic uncertainty have      disadvantages of centralized and decentralized
the nature of behavioral uncertainty. Therefore, it    architecture of UAV group management, presents
is necessary to adapt pre-designed decision-           tables of the dependence of the level of onboard
making models to change many possible                  automation and the number of UAVs in the group.
situations.                                                The article [8] developed a method of planning
    Tasks of this class require increasing the level   the flight path of UAVs to search for a dynamic
of automation of their solution. The reason for this   object in the forest-steppe area, taking into
is the dynamism, ephemerality and high degree of       account possible options for its movement.
uncertainty of the air and ground conditions, time         The article [9] is devoted to the development
constraints. But the task of automating the            of a meta-model of a multi-agent system for
planning of UAV flight routes is complicated by        searching and influencing a ground object by a
the need to take into account the experience of        group of unmanned aerial vehicles under a
decision makers (DM). This requires formalizing        centralized control variant. The base of rules of
one's own knowledge and experience in ATS. To          logical inference for agents according to the
work with knowledge, including its formalization,      solved tasks and a role of the agent in group which
it is necessary to improve mathematical support        is based on use of production model is developed.
and software (MSS). Trends in the development              The work [10] is devoted to the development
of MSS show the need for the introduction of           of a method of UAV route planning when
modern information technology (IT), including          performing missions to search for a stationary
intelligent IT. They are aimed at creating and         object. The method allows to take into account the
using the knowledge bases (KB) of the UAV              distribution of probabilities of importance of the
control system (CS) [13-16, 22].                       area of the task.
    The knowledge base is a set of rules, facts,           In [11] a method of substantiation of the
derivation mechanisms and software that describe       optimal route of air reconnaissance was
a subject area and are designed to represent the       developed. The paper proposes indicators and
accumulated knowledge in it [17]. The most             criteria for the effectiveness of the search for a
difficult stage of creating a database is the          dynamic object.
formalization of knowledge in a given subject              In [12] the issue of efficiency of decentralized
area.                                                  control of UAV group and operator load when
interacting with decentralized scheduler is                 𝐴̃ = {(𝑥, 𝑢, 𝜇𝐴̃ (𝑥, 𝑢))|∀𝑥 ∈ 𝑋, ∀𝑢 ∈ 𝐽𝑥𝑢              (1)
considered.                                                                    ⊆ [0,1]}.
    In [13, 14] the factors of influence of the                              ̃
                                                             The discrete 𝐴 can be represented as
external environment are considered, which, in
turn, make changes in the initial result of UAV                                           𝜇𝐴̃ (𝑥)
flight planning. These factors are taken into                           𝐴̃ = {∑                  }=
account with a high degree of subjectivity of the                                            𝑥
                                                                                 𝑥∈𝑋                               (2)
person planning the flight route. In [14, 15]
mathematical models are considered, which aim                            𝑁
                                                                                    𝑀
to increase the efficiency of monitoring. To                = {∑               [∑         𝑓𝑥𝑖 (𝑢𝑖𝑘 )/𝑢𝑖𝑘 ]⁄𝑥𝑖 },
determine the optimal flight route, it is necessary                                 𝑘=1
                                                                         𝑖=1
to calculate the probability of performing                      where ∑∑ is the union of x and u.
reconnaissance tasks. However, the experience of
using UAVs in local conflicts shows the need to                 If 𝑓𝑥 (𝑢) = 1, ∀𝑢 ∈ [𝐽𝑥𝑢 , 𝐽𝑥𝑢̅ ] ⊆ [0,1], then the
                                                                                            _
take into account the factors that affect the
                                                        membership function of the second type 𝜇𝐴̃ (𝑥, 𝑢)
effectiveness of monitoring and reconnaissance
                                                        is expressed by the lower membership function of
operations with UAVs. It is necessary to take into
                                                        the first type 𝐽𝑥𝑢 ≡ 𝜇𝐴̃ (𝑥) and, accordingly, the
account the threats and limitations of natural and
technical nature [16, 17], which significantly          upper membership function of the first type 𝐽𝑥𝑢̅ ≡
affect the final result of the flight task.             𝜇̅ 𝐴̃ (𝑥). Then IFST2 can be represented as
    The result of the literature analysis indicates                               𝐴̃ =
the relevance and prospects of research in the                  (𝑥, 𝑢, 1)|∀𝑥 ∈ 𝑋, ∀𝑢 ∈ [𝜇 𝐴̃ (𝑥), 𝜇̅𝐴̃ (𝑥)]
direction of developing intelligent UAV control                                                                    (3)
                                                            {                                                  }
systems. search, detection and destruction of                                ⊆ [0,1]
objects.                                                     The article proposes the use of triangular fuzzy
    Thus, a change in approaches to planning            numbers (TFN) and trapezoidal fuzzy intervals
UAV flight routes will make it possible to better       (TFI). The expediency of their use is due to the
solve the problems of observation, search,              simplicity of operations on them and visual
detection and destruction of objects.                   graphical interpretation.
    The purpose of the study is to develop a                 In the general case, the fuzzy interval is called
method of formalizing knowledge about the               IFST2 A  with convex upper and lower
planning of UAV flight routes on the basis of           membership functions, limiting the area of
interval fuzzy sets in the monitoring, search,          uncertainty of this IFST2. The fuzzy number of
detection and destruction of objects in conditions
of uncertainty.                                         IFST2 is called IFST2 A  with convex and
                                                        unimodal upper and lower membership functions,
2. Problem analysis (Main part)                         which limit the area of uncertainty of this IFST2.
                                                             Features of the representation of TFN or TFI
                                                        in terms of IFST2 are as follows:
    To formalize the knowledge of UAV flight                 – the left and right boundaries of fuzzy
route planning, it is advisable to use interval fuzzy   quantities in terms of IFST2 are not points but
sets of type 2 (IFST2). For IFST2, the values of        uncertainty intervals;
the membership functions of the second order are             – the extreme values of the uncertainty
constant. That is, the membership function is           intervals, in turn, are the boundaries of the two
unified (homogeneous) in contrast to the general        FST1. They are defined by the upper membership
fuzzy sets of type 2 (FST2).                            function 𝜇̅ 𝐴̃ and the lower membership function
    Іnterval fuzzy sets of type 2 allow you to use
                                                        𝜇𝐴̃ . These functions limit the occupied area of
all the tools of interval calculations and are          ¯
expressed by the degree of truth of the                 uncertainty (FOU) TFNIFST2 or TFIIFST2 above
uncertainty. It reflects the vagueness and              and below, respectively;
inaccuracy of the element belonging to a given             – the upper 𝜇̅𝐴̃ and lower 𝜇𝐴̃ membership
                                                                                                      ¯
set. IFST2 (𝐴̃) are characterized by the                functions determine the normal convex FST1 on a
membership function of the second type (order)          non-empty carrier. Moreover, in the case of TFN
𝜇𝐴̃ (𝑥, 𝑢), where 𝑥 ∈ 𝑋 and 𝑢 ∈ 𝐽𝑥𝑢 ⊆ [0,1], 0 ≤        IFST2 it will be unimodal normal convex FST1.
𝜇𝐴̃ (𝑥, 𝑢) ≤ 1,which is expressed                          Thus, it is proposed to formally present the
FOU TFNIFST2 𝐴̃𝛥 in the form of a tuple with                   SISO – a structure that implements one input and
parameters [18-22]                                             one output; MISO – a structure that implements
   𝐹𝑂𝑈(𝐴̃𝛥 ) = 〈𝛼𝜇̅ , 𝛼𝜇 , 𝑎𝜇̅ , 𝑎𝜇 , 𝛽𝜇̅ , 𝛽𝜇 〉, (4)          many inputs and one output; MIMO is a structure
                           ¯           ¯               ¯       that implements many inputs and many outputs.
where 𝛼𝜇̅ – left fuzzy coefficient 𝜇̅ 𝐴̃ ∆;                        When formalizing knowledge about the
      𝛼𝜇 – left fuzzy coefficient 𝜇𝐴̃ ;                        process of planning the route of the UAV flight in
                                                   ∆
        a  – center (modal value) 𝜇̅𝐴̃ ∆;                     the form of a fuzzy production rule that describes
                                                               a predetermined version of the UAV routes, we
       а𝜇 – center (modal value) 𝜇𝐴̃                           will use the rules with MISO-structure.
                                                   ∆
       𝛽𝜇̅ – right fuzzy coefficient 𝜇̅ 𝐴̃ ∆;                      These conditions are factors that take into
       𝛽𝜇 – right fuzzy coefficient 𝜇𝐴̃ .                      account the conditions of monitoring, the impact
                                                       ∆       of the external environment, and the conclusions
    In this case, the triangular upper membership              – recommendations on the appropriate route of the
function 𝜇̅ 𝐴̃ ∆; 𝐹𝑂𝑈(𝐴̃𝛥 ) generates a normal                 UAV flight in specific conditions.
unimodal convex FST1 on a nonempty carrier –                       When developing a method of formalizing
an open interval [𝑎𝜇̅ − 𝛼𝜇̅ , 𝑎𝜇̅ + 𝛽𝜇̅ ], and the             knowledge about the planning of UAV flight
triangular function 𝜇𝐴̃ 𝐹𝑂𝑈(𝐴̃𝛥 ) generates a                  routes on the basis of interval fuzzy sets, the
                               ∆                               following limitations and assumptions are taken
normal unimodal convex FST1 on a nonempty                      into account:
carrier – open interval [𝑎𝜇 − 𝛼𝜇 , 𝑎𝜇 + 𝛽𝜇 ].                      - issues related to the assessment of the
                                   ¯       ¯   ¯           ¯
                                                               adequacy and informativeness of the parameters
    It is also proposed to formally represent FOU
                                                               used to describe the projected situation are
TFI IFST2 in the form of a tuple with the
                                                               considered resolved and are not considered in this
following parameters:
                                                               study;
                   𝐹𝑂𝑈(𝐴̃𝛱 ) =                                     - construction of membership functions for
                                                        (5)
        = 〈𝛼𝜇̅ , 𝛼𝜇 , 𝑎𝜇̅ , 𝑎𝜇 , 𝑏𝜇̅ , 𝑏𝜇 , 𝛽𝜇̅ , 𝛽𝜇 〉,        conditions and conclusions of fuzzy production
where 𝛼𝜇̅ – left fuzzy coefficient 𝜇̅ 𝐴̃п ;                    rules begins with the use of the simplest forms of
      𝛼𝜇 – left fuzzy coefficient 𝜇𝐴̃п ;                       membership functions – piecewise linear
                                                               functions. Subsequently, their nature can be
       𝑎𝜇̅ – lower modal value 𝜇̅ 𝐴̃п ;
                                                               clarified and taken into account during the
       𝑎𝜇 – lower modal value 𝜇𝐴̃п ;                           adjustment of the rules (for example, at the stage
       𝑏𝜇̅ – upper modal value 𝜇̅ 𝐴̃п ;                        of learning a fuzzy logical system);
       𝑏𝜇 – upper modal value 𝜇𝐴̃п ;                               - issues of ensuring the completeness and
        𝛽𝜇̅ – right fuzzy coefficient 𝜇̅𝐴̃п ;                  consistency of a set of fuzzy production rules in
                                                               this study are not considered.
        𝛽𝜇 – right fuzzy coefficient 𝜇𝐴̃п .
                                                                   The method of formalizing knowledge about
    In this case, the trapezoidal upper membership             the process of planning a reconnaissance flight of
function 𝜇̅ 𝐴̃п 𝐹𝑂𝑈(𝐴̃𝛱 ) generates a normal                   a UAV based on IFST2 includes the following
convex FST1 on a nonempty carrier – an open                    main stages:
interval [𝑎𝜇̅ − 𝛼𝜇̅ , 𝑏𝜇̅ + 𝛽𝜇̅ ], and the trapezoidal             - presentation of factors that take into account
lower function 𝜇𝐴̃п 𝐹𝑂𝑈(𝐴̃𝛱 ) generates a normal               the conditions of monitoring, exploration,
                                                               environmental impact in the form of linguistic
unimodal convex FST1 on a non-empty carrier –
                                                               variables for each projected option;
open interval.
                                                                   - formation of the area of definition of
    In this case, the set of fuzzy production rules
                                                               linguistic variables used to describe the conditions
will be called the base of rules (BR). It is intended
                                                               of monitoring, exploration and environmental
for the formal presentation of empirical
                                                               impact;
knowledge or expert knowledge (DM) on a
                                                                   - formation for each linguistic variable of the
subject area based on IFST2 [22]. In the general
                                                               term set, as elements of which use the names of
case, there are the following BP:
                                                               fuzzy variables that describe the linguistic
    • by type of fuzzy production rules [17]
                                                               meanings of the conditions of monitoring, the
(depending on the formal representation of the
                                                               impact of the external environment;
derivation of the rule): fuzzy statements; clear
                                                                   - description of UAV flight route options;
statements; functions;
                                                                   - formation of many of the most important
    • by the structure of fuzzy production rules:
                                                               objects of monitoring, intelligence based on the
assessment of the degree of non-dominance of the        information preparation and direct planning of
elements;                                               UAV routes is up to 66% of the total time for
    - presentation of options for the location of       making a decision [10, 19, 22].
ground objects, the impact of the external                  The mathematical expectation of the total time
environment, the appropriate variant of the UAV         for making a decision is 𝑀∗ [𝑇̅𝑡 ]=211,59 s; the
flight route in the form of fuzzy production rules,     time spent on entering the initial data –
where as an antecedent, a follower use fuzzy            𝑀∗ [𝑇̅𝑒 ]=67 s (up to 31% from 𝑀∗ [𝑇̅𝑡 ]) the waiting
linguistic statements.                                  time for the result of solving the problem –
    Thus, it is investigated that for the task of UAV   𝑀∗ [𝑇̅𝑟 ]=73,63 s (up to 35% from 𝑀∗ [𝑇̅𝑡 ]).
flight route planning at the planning and               Efficiency of decision-making by a decision-
reconnaissance planning stage it is expedient to        maker at the stage of planning UAV flight routes
use heuristic methods. They are looking for             may turn out to be unacceptably low (P=0.47 ...
solutions within some subspace of possible              0.9). To increase the efficiency of decision-
acceptable solutions. They are the best in terms of     making, it is necessary to reduce the time for
taking into account the practice, experience,           preparation and the direct solution of the problem.
intuition, knowledge of ATS. The values of                  In the proposed approach to planning the
individual predicted factors should be represented      routes of the UAV reconnaissance flight, the
using the mathematical apparatus of fuzzy sets. A       mathematical expectation of the total time for
method for formalizing knowledge about UAV              making a decision was 𝑀∗ [𝑇̅𝑡 ]=103,59 s, the time
flight route planning based on interval fuzzy sets      spent by the decision-maker for entering the initial
in conditions of uncertainty has been developed.        data was – 𝑀∗ [𝑇̅𝑒 ]=13,74 s (up to 13%
With its help it is possible to formalize the factors   from 𝑀∗ [𝑇̅𝑡 ]), the waiting time for the decision
that take into account the conditions of                result was – 𝑀∗ [𝑇̅𝑟 ]=33,71 s (up to 32% from
monitoring, search, detection and destruction of        𝑀∗ [𝑇̅𝑡 ]).
objects, the impact of the external environment on          The proposed approach to planning UAV
the range of UAVs.                                      flight routes under conditions of uncertainty
    They are presented in the form of linguistic        makes it possible to reduce the total decision-
and interval-estimated parameters for each option.      making time by up to 2 times.
This approach allows:
    - take into account uncertainty;
    - to form the area of definition of linguistic      4. References
variables that are used to describe the conditions
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