The features of the application of two-module sum codes in the synthesis of self-checking digital devices are considered. It is shown that the use of two-module sum codes significantly expands the number of ways to synthesize concurrent error-detection circuit both according to the traditional structure with the addition of data vectors with test ones, and according to an alternative one based on the principle of Boolean signals correction. Previously unknown characteristics of error detection by two-module sum codes in the residue ring modulo M = 4 with a “half division” of data symbols into two subsets have been established. It is shown that the number of potential undetectable errors in the codewords of two-module sum codes is ten times greater than the number of undetectable errors that occur exclusively in the data symbols of codewords. It is advisable to use this feature in the synthesis of concurrent error-detection circuit based on the Boolean signals correction by selecting a group of outputs, the signals from which are corrected in the concurrent error-detection circuit. The rule of allocation of functionally independent groups of outputs of the diagnostic object is applied. A generalized algorithm for the synthesis of concurrent error-detection circuit based on the Boolean signal’s correction using two-module weight-based sum codes has been formed. The experiment shows that using two-module weight-based sum codes, it is possible to obtain less redundant self-checking devices than using classical approaches. The results obtained in the course of the study can be effectively used in the development of self-checking digital devices and computing systems.

An algorithm for terminal control of the approach of a space robot to an orbital object located in a coplanar orbit is proposed. The range, relative approach velocity, and angular velocity of the line of sight are selected as input parameters of the algorithm. The results of numerical modeling of the approach process of a space robot to an orbital object, performed according to the proposed algorithm, are presented.

The problem of adaptive control of multichannel nonlinear systems with unaccounted input dynamics under parametrically uncertain disturbances is considered. It is shown how the approach based on a “post-processing” adjustable internal model can be used to provide compensation for harmonic external disturbances. The adaptation algorithm is synthesized based on the stability analysis of the closed system using Lyapunov functions.

The optical losses in the intersection region of a gold electrode and a thin-film lithium niobate optical waveguide are investigated. It is possible to reduce the absorption of optical radiation in the waveguide by selecting the buffer layer thickness. Using the finite element method and the Mueller and Newton–Raphson numerical methods, the dependence of the optical losses in the waveguide on the buffer layer thickness is determined. It is shown that when the buffer layer thickness changes from zero to one micrometer, the optical losses in the intersection region of the waveguide and the electrode decrease from 6·102 to 10–3 dB/cm for the fundamental TM mode and from 102 to 10–3 dB/cm for the fundamental TE mode. The correctness of the calculation is confirmed by the consistency of the data obtained by three different methods. The results can be used in designing functional elements of photonic integrated circuits (phase, amplitude modulators, etc.) with minimal optical losses due to absorption of gold electrodes.

An algorithm for determining the distance between observed objects and their linear dimensions in the field of view of an active-pulse television measuring system (AP TMS) using depth maps obtained by the multi-area range measurement method (MARMM) has been developed and experimentally studied. The possibility of using AP TMS and MARMM for the task of remotely measuring distances between observed objects and their linear dimensions has been assessed. The proposed algorithm allows determining the dimensions of objects and the distances between them based on known AP TMS parameters and information on the location of pixels on the matrix of the photodetector. The objects dimensions are understood as their linear quantities — width and height, determined in the metric coordinate system. Information on the location of pixels on the matrix includes the coordinates of pixels (row and column numbers of the matrix), which correspond to certain points of objects, in the coordinate system of the photodetector matrix (row and column numbers of the matrix). The algorithm adapts the known relationships of geometric optics for MARMM used in AP TMS. An experiment performed in laboratory conditions with an AP TMS prototype is used to test the algorithm. Results of the measurements show that the use of MARMM with 50 ns duration of the electron-optical converter strobing pulse provides the standart deviation (SD) of the calculated values relative to the reference (measured): for the objects sizes, SD = 0.01 m (no more than 5%); for distances between objects, SD = 0.12 m. Thus, the proposed algorithm can be used in practice for remote determination of linear dimensions of objects and distances between them using AP TMS.

Amethodology for studying the dependence of LED system radiation parameters on temperature is proposed. The design of the developed experimental stand is presented. Measurements of LED radiation intensity at various temperature values are performed.

Quasi-static oscillations of a piezoelectric disk with several electrodes are studied in order to determine their optimal configuration during operation of the piezoelectric element as part of a device. The first criterion of optimality is the value of axial deformations of the geometric center of the piezoelectric element surface. The second criterion is the value of the response voltage taken from the feedback electrode of the piezoelectric element. A finite element model of the piezoelectric transducer is built in the Ansys Workbench software product. The values of the response voltage and the amplitude of axial deformations are calculated for various electrode configurations. Experimental studies of the response voltage at various frequencies of the transducer are carried out: at a resonance frequency of 1200 Hz and far from the resonance frequency at 300 Hz. Using laser interferometry methods, the values of axial deformation are experimentally studied at a frequency of 400 Hz. The results of modeling and experimental studies show similar trends. The discrepancy between the simulation results and the experimental data is due to the discrepancy between the actual values of the piezomodules and the manufacturer’s reference data. The results obtained allow us to formulate recommendations on the location and purpose of the electrodes of disk piezoelectric transducers.

Amethod of optical alignment of photomask and blank for installing direct exposure of PCB on a liquid crystal matrix to form a desired topology on the photosensitive material is presented. In particular, the processes of calibrating the video camera position relative to the working field of the installation and positioning the image with the transferred topology relative to the workpiece position are considered. Implementation algorithms are compiled for each process and experimental testing is performed to confirm their operability. Statistical analysis shows an error in alignment the photomask topology with the blank of ± 300 microns. The developed algorithms and corresponding software implementations can be used as a methodological and programmatic basis for a study of methods for evaluating and compensating for PCB deformation during its manufacture.

The problem of reducing the difference in the values of reliability indicators of products in the electronic and instrument-making industries, in particular, failure-free operation, between the predicted data and the actual ones obtained from the results of testing and operation is considered. It is shown that the efficiency of the quality management system of the performing organization affects the provision of the target level of reliability of electronic modules. A method is proposed that takes into account the quality of the implementation of mandatory procedures and a questionnaire structure is developed for expert assessment with the possibility of ontological study of the organization's strengths and weaknesses in the implementation of the technological process. The developed method allows for a numerical assessment of the degree of implementation of procedures and operations at each stage of the life cycle, which enables timely feedback to eliminate errors or violations identified by the audit results with localization of the organization's structure and personnel category. A new differentiated quality coefficient of the technological process is introduced to replace the integral quality coefficient of production.