Abstract We consider the problem of estimating the impulse characteristic of a linear time-invariant discrete-time dynamical system, using data on its input and output signals. We propose versions of estimation methods for asymptotically stable dynamical systems in the context of various approaches to the presentation of parametric uncertainty, including approaches based on the interval analysis and

Abstract This paper considers the problem of determining the position of the center-of-mass and inertia tensor of a microsatellite mockup on an air-bearing testbed by using optical measurements. The position of the mockup’s center of mass can be shifted relative to the suspension’s center by using a system of electrodynamic linear actuators and loads fixed on them. Using the equations of motion of

Abstract A problem of the synthesis of programmed motions of mechanical systems based on the use of time polynomials is considered. The programmed trajectory is selected in the class of monotonic third-order polynomials on the given time interval based on the initial and final states of the system, as well as constraints on the state and control variables. The problem of taking into account the restrictions

Abstract The problem of constructing all simple paths in an undirected graph that pairwise connect vertices from the given set is interpreted as constructing a graph that is a union of these paths. This construction relies on the computation of biconnected components and bridges of the source graph. A new algorithm which makes this computation more transparent and controllable is proposed. Its idea

Abstract Mathematical models for the deployment and adjustment of a large-sized space-based reflector are presented. Optimal control algorithms are developed for the automatic deployment of antenna elements and tuning of a radio-reflecting mesh. The results of numerical modeling are presented, showing the advantage of using the algorithm for correcting the parameters of the control structure in comparison

Abstract A method of overcoming obstacles by a hexapod robot is developed. The obstacles are formed by single cylinders of large radii or by a set of spaced cylinders of small radii that lie on a horizontal plane under the action of the gravity force; the Coulomb friction and rolling friction are taken into account. It is proved that, if the radius of a single cylinder is comparable with the robot’s

Abstract In 1973 E.W. Dijkstra introduced the notion of self-stabilization in the context of mutual exclusion. Considering the same problem on an array, we present a game theoretic analysis of self-stabilizing systems with three- ‎or four-state machines. We give a formalized definition of the problem as a game where each player’s strategy represents the state of its corresponding machine. For the three-state

Abstract Orbits that are unfavorable for the observer, whose plane passes near the orbital plane, are considered. Replacing the observer’s motion with an approximately equivalent motion in the orbital plane leads to a simple two-dimensional model to measure the motion. The Rao–Cramer bounds for the estimates of the orbital parameters are determined. The observation elevation angles are related to true

Abstract In this paper, we consider a compensation-type quartz pendulum accelerometer, a feature of which is the use of a digital feedback amplifier in the control loop (for the implementation of a discrete controller and algorithmic compensation for errors from the pendulum unbalance and temperature dependences of the zero offset and scale factor). The problem is related to the construction of a digital

Abstract The results of studies of the effectiveness of the optimal radar altimeter when tracking targets moving along trajectories of varying complexity are presented. The tracking system of the altimeter is obtained in the first part of this article by the local minimization of the quadratic-biquadratic quality functional.

Abstract This paper considers the design problem of a stochastic linear-quadratic controller over an infinite time-horizon with dynamic scaling of the coefficients in the state equation and the cost criterion. Dynamic scaling means multiplying the coefficients by a positive time-varying function. The optimality criteria used are extensions of the long-term average cost and pathwise long-term average

Abstract Generative adversarial neural networks are used to increase the resolution of satellite images of a certain class without additional data. The quality of the obtained high-resolution images is assessed by the signal-to-noise ratio and the measure of structural similarity. Based on the known loss functions used in generative adversarial neural networks, a function specific to the problem being

Abstract In this paper, an approach to numerical integration of equations governing motion of constrained mechanical systems is suggested. In this approach, unknown reaction forces acting on the system are treated as controls, and the algebraic equations that these reactions satisfy, as control goals. Based on the suggested approach, an algorithm for numerical solving rolling equations is developed

Abstract The problem of the functional diagnostics of engineering systems described by nonlinear differential equations with constant coefficients in the presence of disturbances is considered. To solve the problem of fault identification, the sliding-mode observers are used. The proposed approach is based on the idea of constructing a reduced model of the original system (a model with a lower dimension)

Abstract A sweep method is proposed for solving the optimal control problem with unseparated boundary conditions. This model reduces the boundary conditions to the initial condition. Using the properties of the J-symmetry of the corresponding Hamiltonian matrix and Euler–Lagrange equations, it is shown that linear algebraic equations for determining the missing initial data of the system being solved

Abstract We consider a small device for converting the medium’s flow energy, which is designed based on the use of a crank mechanism. A blade interacting with the flow is fixed on the connecting rod of the mechanism and the crank shaft is connected to the electric generator’s rotor. The system has a control input that allows us to control how much of the energy taken from the flow is converted into

Abstract The problems of artificial intelligence, control and decision-making with incomplete or unreliable information include a wide class of problems of abductive explanation of the observed, including cause–effect problems. The study is devoted to the substantiation of the method of logical formation of hypotheses explaining the observed. Means of knowledge representation and derivation of hypotheses

Abstract In this paper, we analyze the problems of using two-beam laser-ranging systems (often called lidars) on unmanned vehicles to ensure traffic safety and ways to solve them. A cost-effective way to implement a lidar system with controlled (adaptive) scanning of the road surface is proposed. Algorithms for processing information and controlling the inclination angle of laser beams for sounding

Abstract Iris-based identification is a well-known and widely used technology. However, its use in mobile devices is limited due to the algorithmic complexity of the existing methods and their low universality with respect to various capturing conditions. A method for finding the iris area by approximating its boundaries by two circles is proposed. The relative error of determining the circle parameters

Abstract The features of the functioning of the systems of automatic tracking of air objects, optimized according to the classical quadratic functionals, are considered, and their shortcomings are noted when tracking objects moving along complex trajectories. A variant of the solution of the problem of the local optimization of automatic tracking systems based on minimizing quadratic-biquadratic quality

Abstract The use of stochastic gradient algorithms for nonlinear optimization is of considerable interest, especially in the case of high dimensions. In this case, the choice of the step size is of key importance for the convergence rate. In this paper, we propose two new stochastic gradient algorithms that use an improved Barzilai–Borwein step size formula. Convergence analysis shows that these algorithms

Abstract In the kinematic formulation, two problems are considered for the time-optimal control of the position of a single-link pendulum fixed on a movable base that can move along the horizontal axis. In the first problem, the initial position of the pendulum is the lower, stable position of the pendulum; it is required to transfer it to the upper, unstable position resting either in an arbitrary

Abstract Recently, unmanned aerial vehicles are being used more often for reconnaissance in combat conditions. Communication with unmanned aerial vehicles must be carried out in a confidential mode to protect against the interception of control, while being fast and resistant to attacks from outside. A new algorithm for transferring confidential data, based on the properties of extremal uniform hypergraphs

Abstract We consider a system with two degrees of freedom (a pendulum on a trolley) in the case where one restricted control force is applied to the trolley. The task of a time-optimal horizontal movement to the required distance from the given equilibrium position to another identical state with the suppression of oscillations is solved. Trajectories that meet the necessary optimality conditions for

Abstract We consider a methodology for organizing hybrid computing structures to simulate abrupt changes in controlled natural processes and analyzing phases of extreme environmental phenomena. Systems of differential equations with the dynamically redefinable right-hand side at special moments (events) are used. The truth conditions for transitions are obtained from computing other equations for additional

Abstract A telematics device is modeled as a two-stream Markov one-channel priority queuing system of finite capacity equipped with a probabilistic pushing out mechanism. Its probability, \(0 \leqslant \alpha \leqslant 1\), of pushing out is the control parameter of the queuing system. It is experimentally and theoretically proved that on the plane of the load factors for high-priority and low-priority

Abstract The calculation of the set of all simple paths connecting two vertices of an undirected graph is considered. The more general problems of connecting vertices which belong to disjoint sets of vertices in a graph by all simple paths are also investigated. The connection between these problems and finding vertex biconnected components and graph bridges is established, and based on this their

Abstract The problem of logical recognition of the operating mode and dynamic estimation of the intra-mode state vector of a discrete-time stochastic Markov system with a random structure is considered. To develop an estimation algorithm implemented at the pace of system time on a computer of limited power, a method for designing a new finite-dimensional optimal structure filter is proposed. Its state

Abstract The problem is to formalize the solution of a two-person zero-sum multicriteria (MC) game, providing a payoff to both players with respect to their MC best guaranteed results. As the basic concept of the solution of the MC game, the Shapley equilibrium is selected. It is parametrized by the inverse logical convolution based on scalarization in the Germeyer sense, i.e., on the weighted maximin

Abstract As all computational programs, derivation sequences of functional dependences are twice partially ordered sets: by following the instructions in the program and by their execution in time. Order consistency is achieved by the theoretical multiple embedding of one into another. Hereinafter, such sets are referred to as cascade ordered, and there is no need to resort to the terminology of the

Abstract The concept of the Artificial Dispatcher autonomous intelligent control system for integrating into modern automatic control systems of electric networks in order to improve the efficiency of managing the modes of electric power systems is proposed. This intelligent control system is implemented based on the deep machine learning technology and joint use of the Monte Carlo tree search method

Abstract A description of the software designed for controlling robotic observatories is given. Its main features and functional capabilities are described. Special attention is paid to approaches to improving the utilization of the telescope observation time, which is its main resource. A solution for the automation of routine observational tasks the execution of which directly affects the efficiency

Abstract This paper considers the basic constructs and semantics of the action description language designed for defining and computing transformations of situation model relations (relational transformations). The main difference between this language and traditional action description languages (STRIPS, ADL, etc.) lies in the use of—in addition to the traditional (STRIPS-like) rules—their set-theoretic

Abstract An autonomous mechanical system with two rotational degrees of freedom, undergoing the action of conservative and nonconservative forces, is considered. The corresponding dynamical system contains changeable parameters that can be treated as amplifying coefficients for control actions. It is required to select the values of these parameters in order to form an autorotation mode in the system

Abstract We propose an algorithm of a dynamical model for the search-detection-recognition of objects by the onboard thermal-imaging systems operating in the wavelength ranges from 3 to 5 µm and 8 to 12 µm. We provide the main simulation results under the action with respect to ground objects, analyzing the influence of the main agents on the probabilistic-range characteristics of the scene–optical

Abstract A linear stationary system of differential-algebraic equations of an arbitrarily high unsolvability index with interval coefficients is considered. Sufficient conditions under which the general solution of the perturbed system has the same structure as the solution of the original system are obtained. These conditions are formulated as finite relations to be satisfied by the interval coefficients

Abstract An approach is proposed to identify abnormal modes of a power system in real time, using only the data of synchronized vector measurements and that does not require a priori information about the parameters of its mathematical model. The algorithmic base of the method is the algebraic criterion of consistency of the linear matrix equation for the identification of the mathematical model of

Abstract In the computational experiments on a model of a multiuser communication and control network, changes in the system’s performance under destructive effects are studied. The vector of the maximal flows that can be transmitted independently between all nodes is used for the multicriteria assessment of the system’s functionality. The set of damage of various types is considered, consisting of

Abstract The classical assignment problem is considered. A third index is introduced, which can characterize, for example, the location of the work carried out. An iterative decomposition algorithm is proposed. At each step, a problem is solved with three constraints from different groups of conditions and with one connecting variable. The triples of problems are also solved with one restriction, and

Abstract An effective (performance- and accuracy-wise) computational method for pattern recognition in a continuous video stream using deep neural networks for access control systems is proposed. The class of recognition problems solved by the method using a sequence of video stream frames is identified: the vehicle itself and the characters on its license plate (LP), faces of people, and abnormal

Abstract In this paper, we develop structural solutions of the selectively invariant electromechanical systems (SI EMSs) that adapt the regulators presented in the canonical form of controllability (CFC) and in the canonical form of observability (CFO) to changes in the velocity level. Their capabilities to provide the specified quality indicators in a wide velocity range are comparatively analyzed

Abstract The problem of increasing the maneuverability of a spacecraft (SC) by minimizing the duration of rotations around the center of mass is solved. The case is studied when the orientation is controlled using inertial actuators (power gyroscopes, gyrodynamics). The problem of the fastest possible turn of an SC using gyrodynes from an arbitrary initial angular position to the desired final angular

Abstract We model movements of a person swinging on a swing. We consider a flat three-link hinged mechanism as the main mechanical model of the person sitting on the swing. The first, second, and third links model the human body, two hips that are rigidly connected to the swing, and two shins, respectively. The hinge between the first and second links models two hip joints, while the hinge between

Abstract This paper demonstrates the technology for calculating spacecraft’s (SC’s) programmed laws of orientation that does not generate special, singular, states of the control moment gyro systems and consists of two collinear gyrodyne pairs. The calculation of the programmed orientation laws that do not contain singular states for two pairs of gyrodynes is possible due to the use of the kinematic

Abstract In the paper, the requirements for aircraft guidance methods are considered. It is noted that the existing methods of optimization of linear control systems based mainly on the minimization of quadratic functionals of quality do not allow providing the set of requirements for interception systems of aerial objects. It is proposed to use new local quadratic-biquadratic quality functionals,

Abstract In the computational experiments on a flow model of a communication and control network, changes in the system’s functional characteristics under destructive effects are studied. The removal of a subset of edges is considered to be critical damage if it results in the absence of connection paths for at least one pair of source-sink nodes. For each case of damage, both the total number of disconnected

Abstract The development of the theory of absolute stability, the theory of bifurcations, the theory of chaos, theory of robust control, and new computing technologies has made it possible to take a fresh look at a number of well-known theoretical and practical problems in the analysis of multidimensional control systems, which led to the emergence of the theory of hidden oscillations, which represents

Abstract The height of a building is a basic characteristic needed for analytical services. It can be used to evaluate the population and functional zoning of a region. The analysis of the height structure of urban territories can be useful for understanding the population dynamics. In this paper, a novel method for determining a building’s height from a single-shot Earth remote sensing oblique image

Abstract Cryptography and biometry are important components of contemporary access control systems. Cryptographic systems themselves are highly reliable but they require the exact reproduction of access keys; this cannot be done by humans, while the corresponding devices might be lost or stolen. Biometric data are always with the person; however, they vary: it is impossible to obtain the same feature

Abstract An approach to test the diagnostics of distributed computing systems based on the introduction of redundancy in the system in order to simplify the test construction process and the diagnostic process is investigated. The introduced redundancy is a diagnostic model of the system, which runs in parallel with the main software of the system. For this model, sufficient conditions for controllability

AbstractA constructive solution of the optimal energy-efficient programmed control problem for distributed parameter systems with a given-precision uniform approximation of the space distribution of the controlled variable with respect to the desired state is proposed. The computational algorithm developed below involves a special-form preliminary parametrization procedure for control actions on finite-dimensional

AbstractThe work is devoted to studying the dynamics of unstable oscillating systems (in the form of an inverted pendulum) controlled by the action of a hysteretic type. The results for different types of motion of a suspension point are presented, in particular, for vertical and horizontal motion. A mathematical model of the inverted pendulum with an oscillating suspension is considered. For this

AbstractWe consider the problem of refining the evolving Earth Orientation Parameters (EOP) used during the converting from the inertial coordinate system to the Earth’s coordinate system, including ephemerides computations onboard spacecraft (SC). We discuss the approaches and technologies used to refine these parameters. We propose a concept to refine EOP by ground stations and SC, based on processing

AbstractThe optimal control problem of the random-jump structure of an object under counteraction conditions is considered. The counteracting parties observe any changes in the object’s structure using special indicators that operate with errors. The optimality criterion of the controls is a certain functional of the object’s state. One of the opponents seeks to minimize this criterion, whereas the

AbstractWe propose a method for obtaining the implication conditions of the properties of a mathematical model of a system from the structurally close properties of a model of another system related to the former one by cross-model linking objects. This method is applicable to various models and their properties. Any implication conditions for the properties are not required to be given a priori. They

AbstractIn this study, we consider a flat rotation of an electric rectilinear rod controlled by an electric drive, loaded at the free end by a point mass. The problem is to optimally control the voltage in the motor’s winding, which transfers the system to the final state with the damping of the elastic vibrations. A generalized formulation of the equations of the rod’s state and a method for approximating

AbstractThe identification of attempts to substitute images plays an important role in protecting biometric systems (authorization in mobile devices, access control systems for premises, terminals with automatic access by face recognition, etc.). This study presents a new method for detecting falsified images based on processing the multimodal data from a camera. A new neural network architecture is

AbstractA hybrid simulation method applied for developing and testing the process of spacecraft berthing (i.e., docking using a space manipulator) is described. In this method, the manipulator’s dynamics and the relative motion of the objects to be docked are computed using a mathematical model and the docking units are real-life copies. The relative motion of these units is reproduced on a 6-degrees

AbstractThe problem of the functional diagnosis of critical systems, described by a nondeterministic finite state machine model, is considered. A new method for solving the problem is proposed, the distinguishing feature of which is the use of the mathematical apparatus of the algebra’s covers. The features and advantages of the method are illustrated by the example of the problem of monitoring the

AbstractWe consider a mathematical model of a horizontal-axis wind-energy unit in which Savonius rotors are used instead of classical blades. The Magnus force formed due to the autorotation of Savonius rotors creates a momentum supporting the rotation of the central turbine shaft. The main difference of this study from earlier investigations in this area is as follows: we take into account the variation