### INFORMATION TECHNOLOGIES AND SYSTEMS, COMPUTER TECHNIQUE

SYNTHESIS OF BUILT-IN CONTROL CIRCUITS FOR COMBINATIONAL DIGITAL DEVICES
BY THE METHOD OF SELF-DUAL COMPLEMENT TO THE BERGER CODE
Ephanov Dmitry V., Sapozhnikov Valery V., Sapozhnikov Vladimir V.

697

A new structure is presented for a self-checking combinational device with a built-in control circuit implemented according to self-dual complement method for summation codes. In contrast to the known ones, the proposed structure uses a summation code encoder, which makes it possible to reduce the number of controlled functions. The considered method is a development of the known control methods - self-dual parity and self-dual duplication. No malfunctions that distort the outputs of the encoder on direct and inverse combinations are found in the object of diagnostics. The probability of the existence of such faults is low, and therefore a sharp increase in the percentage of error coverage can be expected compared to using the parity code and, quite possibly, compared to duplication with self-dual complement. The use of the method makes it possible to synthesize simpler devices than with the duplication method, as well as to build completely self-checking devices, even in the case when this is impossible during duplication. It is possible to optimize indicators of the technical implementation of the built-in control scheme complexity by choosing the simplest blocks for calculating correcting functions from their entire variety.

METHOD OF INTELLIGENT QUASI-INDIFFERENT DATA AGGREGATION
IN HETEROGENEOUS WIRELESS SENSOR NETWORKS
Aleхey M. Pavlov

709

A new method for intelligent quasi-indifferent data aggregation of heterogeneous wireless sensor networks is presented. The essence of the method consists in converting the initial vectors of values recorded by the sensor nodes to vectors of values of the coefficients of piecewise polynomial regression containing a smaller number of elements, as well as in forming them into groups by calculating the Chebyshev distance with subsequent comparison with a threshold value. The developed method includes the stage of data adaptation to anomalies, which is provided by calculating and comparing with the threshold value of the scaled mean absolute deviation. The method is focused on the use in the hardware and software logic of local computing devices — sensor nodes — and can serve as a basis when designing various routing protocols for heterogeneous wireless sensor networks.

ALGORITHM FOR SYNTHESIZING VIRTUAL ANTENNA ARRAY APERTURE
BY EXTRAPOLATING THE APERTURE FUNCTION BASED ON SEQUENTIAL SIGNAL PROCESSING
Andrey P. Aleoshkin , Vladislav V. Vlaimirov

720

The ways of increasing a radar station detecting ability are analyzed and a promising software and hardware architecture are presented. As an original solution, a principle of synthesizing a virtual aperture is substantiated. The principle is based on extrapolation of the antenna array aperture function as applied to solving the problem of detecting stationary objects in condition of reliable background and target setting. The algorithm for virtual aperture synthesizing is considered in detail and a variant of its implementation is described. The main calculation ratios are formulated, and simulation data are presented.

### INSTRUMENTS AND SYSTEMS OF AUTOMATIC CONTROL

NUMERICAL METHODS OF OPTIMIZATION FOR ROBUST CONTROL
OF ROBOTIC AND MECHATRONIC SYSTEMS
Teresa Orłowska-Kowalska, Sergey Yu. Lovlin, Madina Tsvetkova, Musalimov Victor M, Abramchuk Mikhail V.

728

A new numerical method is developed for optimization of robust control over robotic and mechatronic systems. The method is based on minimizing the maximum of control system frequency response to disturbance in coordinate under regulation. The system stability is ensured by a new method of limiting the search area for the regulator parameters, based on the stability margin radius. This optimization method consists of parametric and structural tuning of the control system. Correctness of the proposed method is confirmed by presented results of numerical experiments.

### ELECTRONIC AND ELECTROMAGNETIC DEVICES

EVALUATING THE EFFECTIVENESS OF REDUNDANCY METHODS
FOR LINE MODULAR SOURCES OF SECONDARY POWER SUPPLY
Valery V. Zhadnov, Arina S. Lukina, Ivan S. Tselishchev

741

The issues of ensuring operational reliability of modular sources of secondary power supply by applying redundancy of their power channels are considered. Methods of the theory of reliability and simulation are used. An analysis of main ways of redundancy of modular secondary power supply sources (loaded, unloaded, mixed) and the features of their power channels functioning (time schedules of channel operation, change in the load of operating channels, channel failures during their switching) is presented. With the use of a specialized program implementing the Monte Carlo method, computational experiments are carried out to assess the probability of failure-free operation with various methods of redundancy. It is shown that for a modular secondary power supply source, it is impossible to pre-assign a redundancy method providing the highest probability of failure-free operation, since the same method can give both better and worse results in comparison with other methods of redundancy, depending on the power channels functioning. Based on presented analysis of obtained results, conclusions are drawn about the effectiveness of various redundancy methods and recommendations for their application are given.

### OPTICAL AND OPTO-ELECTRONIC INSTRUMENTS AND SYSTEMS

CHARACTERISTICS OF THE FIELD CAMERA UNIT FOR THE SPECTRUM-UV PROJECT
Nataliya F. Erkhova, Evgenу N. Sechak, Vladimir E. Shmagin

752

Results of development of optical scheme of the field camera unit (FCU) for the Spectrum-UV project are presented. The FCU is intended to work in the UV spectral range, it provides a sufficiently high image quality, and is used in space-based optoelectronic devices. The main technical and operational characteristics of the field camera unit are presented and the impact of manufacturing and assembly defects of optical elements in the unit on the image quality is assessed.

### INSTRUMENT-MAKING TECHNOLOGY

APPLICATION OF AN ARTIFICIAL NEURAL NETWORK
FOR SOLVING PROBLEMS OF PRODUCTION OPTIMIZATION BASED ON DIGITAL TWINS
Alexey N. Sochnev

759

An approach to solving the problem of operational scheduling of production based on the use of a simulation model controlled by an artificial neural network is proposed. The implemented production simulation model uses the Tecnomatix Plant Simulation software. An example of the proposed approach application for production planning in a typical production system is presented, and the achieved effect is experimentally confirmed for various quality criteria of production plans. The main advantages and disadvantages of the developed approach are revealed, the possibility of implementing the of the approach elements with other types of simulation models is analyzed.

DEVICE FOR RAPID PROTOTYPING
Pavel S. Toporkov, Fedosov Yury V , Afanasiev Maksim Ya

767

The issues of creation and control of a device for rapid prototyping as a part of unified information environment are considered. The research is aimed at development, adjustment and commissioning of a device for rapid prototyping of electrical products using a rational technology. The main tasks and methods of their solution are formulated. Several similar existing devices are analyzed, and their advantages and disadvantages are indicated. The device composition and diagram are described, the principles of its functioning are explained. The choice of materials used is substantiated.

### SCIENTIFIC AND PRACTICAL DEVELOPMENTS

THEORETICAL BASES OF DEVELOPMENT AND RESEARCH OF ELECTRONIC SENSOR
OF SMALL-SIZED AIRCRAFT SPEED VECTOR PARAMETERS
Elena S. Efremova, Nikitin Alexander V. , Soldatkin Vyacheslav V. , Soldatkin Vladimir М.

774

Information on aircraft speed vector module and direction relative to the aircraft's longitudinal axis, determined by the aerodynamic angles of attack and slip, is noted to be of importance for the aircraft piloting and ensuring safety of its movement in the atmosphere. An analysis of available means for determining the airspeed vector, which include the aerodynamic, vane, vortex and ion-beacon methods for measuring the incoming air flow parameters, is carried out. Restrictions on the methods application in the case of a small aircraft are considered. A functional diagram of an integrated electronic sensor of air velocity vector parameters of a small aircraft with ultrasonic measuring channels is presented. Distinctive feature of the sensor is the use of two pairs of combined emitters and receivers of ultrasonic vibrations propagating in the directions of the incoming air flow and against the flow and registered by an electronic measuring circuit with two measuring channels. Analytical models are developed for formation and processing of informative signals, for determining the air speed vector parameters of a small aircraft by frequency, time-pulse and phase informative signals of ultrasonic measuring channels. The competitive advantages and prospects of using the electronic sensor of airspeed vector parameters on small manned and unmanned aircraft are described.

NONLINEAR EXOGENEOUS SYSTEM AND INTERNAL MODELS DESIGN
Alberto Isidori, Pyrkin Anton Alexandrovich, Islam A. Bzhikhatlov, Gromov Vladislav S.

782

The problem of output regulation of plants affected by nonlinear exogenous systems is addressed. The new approach of designing the controller having an internal model, which repeats the dynamics of the disturbance is presented. Two realizable controllers which using measurements of the output and guarantees the achievement of a control goal are proposed: the one for known parameters and the adaptive one.

### BRIEF NOTES

ALGORITHM FOR ESTIMATING THE VARIABLE FREQUENCY OF SINUSOIDAL SIGNAL
Sergey I. Nizovtsev, Shavetov Sergey V, Pyrkin Anton Alexandrovich

789

The problem of identifying time-varying frequency of sinusoidal signal is considered. Using the iterative parameterization procedure, dynamic regressor extension and mixing technique, and Luenberger observer, estimations of non-stationary parameters are designed. Presented results of numerical simulation, the proposed algorithm efficiency is demonstrated.