Articles de revues : « Interference diagram »

1

Avin, Chen, Asaf Cohen, Yoram Haddad, Erez Kantor, Zvi Lotker, Merav Parter et David Peleg. « SINR diagram with interference cancellation ». Ad Hoc Networks 54 (janvier 2017) : 1–16. http://dx.doi.org/10.1016/j.adhoc.2016.08.003.

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Singh, M. P., et J. J. Vargo. « Reliability Evaluation of Shrouded Blading Using the SAFE Interference Diagram ». Journal of Engineering for Gas Turbines and Power 111, n^o 4 (1 octobre 1989) : 601–9. http://dx.doi.org/10.1115/1.3240296.

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The SAFE Interference Diagram is shown to be useful in the design reliability evaluation of shrouded blading, including long-arc shrouding construction. This method provides an alternate method to the widely used Campbell diagram and also brings in more information for easier design evaluation. The SAFE diagram uses the natural frequencies of an entire bladed disk rather than individual blade or packet frequencies. In addition, it compares frequencies, mode shapes, and speed to evaluate whether a resonance occurs. Theoretical arguments are provided for the validity of the SAFE Diagram and its usefulness is shown by practical examples. This method provides an easier means to show why long-arc shrouding works and also when it might not.

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Falci, G., R. Fazio, V. Scalia et G. Giaquinta. « Pair interference and the phase diagram of granular superconductors ». Physica B : Condensed Matter 165-166 (août 1990) : 965–66. http://dx.doi.org/10.1016/s0921-4526(09)80068-9.

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Hu, Zhikang, Xinxin Ji, Buyin Li et Yuanzheng Luo. « A self-assembled graphene/polyurethane sponge for excellent electromagnetic interference shielding performance ». RSC Advances 9, n^o 44 (2019) : 25829–35. http://dx.doi.org/10.1039/c9ra02059d.

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Wei, Ke Xin, Rui Xia Duan et Bin Liang. « Research on Differential-Mode Conducted EMI of Three-Phase PWM Rectifier AC Side ». Applied Mechanics and Materials 130-134 (octobre 2011) : 3289–92. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3289.

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Taking three phase PWM rectifier as the research object, according to interference mechanism of the rectifier bridge, this paper describes the equivalent circuit of AC side differential mode interference and calculates the interference source voltage and differential mode interference voltage of the three phase PWM rectifier AC side in 150KHz-30MHz frequency band. Then we analyze the model of the equivalent circuit diagram using the Saber software and verify the validity of the model and the accuracy of the calculation through experiments.

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Zhang, Kai, et Kun Shang. « The Experimental Data Analysis of Vector Hydrophone ». Advanced Materials Research 204-210 (février 2011) : 1427–30. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1427.

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The paper gives out the calibration method of the sensitivity and phase to a vector hydrophone; it analysed the data from the lake trial and the sea trial. The results indicate that, in the isotropic noise field, the sound pressure and the velocity are not related, but the signals are completely relevant. When there is no coherent interference, both the average sound intensity device and the diagram of the target orientation estimation can efficiently estimate the target orientation; when there is the interference of a strong line spectrum, the average sound intensity device cannot work properly, but the diagram can still effectively estimate the target position; when the target radiates spectrum, the line spectrum of the target orientation estimation can still have very good performance.

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Sikanen, Eerik, Janne E. Heikkinen et Jussi Sopanen. « Shrink-fitted joint behavior using three-dimensional solid finite elements in rotor dynamics with inclusion of stress-stiffening effect ». Advances in Mechanical Engineering 10, n^o 6 (juin 2018) : 168781401878005. http://dx.doi.org/10.1177/1687814018780054.

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In this article, the contact behavior of a shrink-fitted joint in a rotor assembly at different spin speeds is studied, using the three-dimensional solid finite element approach. A custom frictionless contact model is proposed and extensively tested by means of simulation. The theory for solving pre-stressed damped eigenvalue problem is presented and implemented, and the results are presented in Campbell diagram form. Two sample rotor assemblies are studied. In addition, experimental modal analysis results of a shrink-fitted joint with various interferences are presented and numerically studied. The reduction of the interference of the shrink-fitted joint due to centrifugal forces at high-speed operation as well as the contact status are updated at each rotational speed step. The inclusion of stress-stiffening effect is studied in detail. The comparison of the Campbell diagram results with the results obtained using a commercial finite element software (Ansys) shows a good agreement.

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Mazin, A. V., et M. Yu Aliyev. « METHODS OF JAMMING INTERFERENCE ». Issues of radio electronics, n^o 11 (20 novembre 2018) : 80–84. http://dx.doi.org/10.21778/2218-5453-2018-11-80-84.

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The article investigates the problem of providing high noise immunity radar under the influence of passive and intentional interference. The purpose of radio operation of the radar is to create conditions that would impede the operation of systems and minimize its effectiveness. The main method of radio transmission is still creating (staging) interference. Modern radar systems must solve the tasks in terms of electronic suppression using, including intentional interference and under severe time constraints. It is shown that the most effective way to improve the noise immunity of radar systems designed to operate in multipoint space, including non-stationary, interference is adaptive space-time processing of the received signals, based on the angular selection of targets, due to the formation of zeros in the directional diagram in the direction of interference sources. This problem is solved by determining the accuracy of the direction finding of interference sources and is achieved by the joint operation of the antenna array and multi-channel signal processing devices, namely the separation of interference signals on different receiving channels.

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Piza, D. M., et S. N. Romanenko. « ADVANCED GRAM-SCHMIDT METHOD FOR RADAR SIGNAL PROCESSING ». Radio Electronics, Computer Science, Control, n^o 4 (5 janvier 2022) : 26–33. http://dx.doi.org/10.15588/1607-3274-2021-4-3.

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Context. When protecting radar stations from active noise interference acting along the side lobes of the antenna directional pattern, spatial filtering of signals is used, which is realized by using antennas that are spaced apart in space. In this case, the difference in the directions of reception of the useful signal and the interference makes it possible to form the optimal value of the weighting coefficients of the adaptive spatial filters to suppress the interference. However, if the interfering source moves into the main beam region, then the spatial differences between the wanted signal and the interference are reduced. This leads to significant distortion of the main antenna radiation pattern. As a result, the accuracy of measuring the angular coordinates deteriorates, as well as the sensitivity of the radar receiver. The article proposes a structural-parametric method for adapting a spatial filter, which ensures effective operation of the radar when exposed to the active noise interference both from the direction of the side lobes and from the direction of the main beam. Goal. Improving the efficiency of the radar when the active noise interference source is shifted from the direction to the side lobes to the direction of the main beam. Method. The proposed method makes it possible, due to the structural adaptation of the multichannel spatial filter, to exclude the distortion of the main beam of the radiation pattern of the radar antenna and to ensure its operation under conditions of possible interference from the main beam. Structural adaptation of the spatial filter is realized by the current analysis of the weighting coefficients of the compensation blocks. Results. The structural diagram of the multichannel spatial filter by the Gram-Schmidt method with structural-parametric adaptation, as well as the structural diagram of the compensation block, has been improved. As a result of the simulation, the possibility of eliminating distortions of the radiation pattern of the main antenna of the radar in conditions of the possible impact of the active noise interference along the main beam of the radiation pattern of the radar has been confirmed. Conclusions. The scientific novelty of the work consists in the improvement of the signal-processing algorithm at spatial filtering both when exposed to the active noise interference from the direction of the side lobes, and when the interference source is shifted to the direction of the main beam of radar. The practical novelty of the work lies in the development of a structural diagram and a mathematical model of an improved spatial filter with structural-parametric adaptation.

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Elsayed, M. A., R. L. Wells, D. W. Dareing et K. Nagirimadugu. « Effect of Process Damping on Longitudinal Vibrations in Drillstrings ». Journal of Energy Resources Technology 116, n^o 2 (1 juin 1994) : 129–35. http://dx.doi.org/10.1115/1.2906017.

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This paper shows the effect of process damping—caused by the interference between the cutter and the previously cut surface—on the stability of drillstrings. The method of including process damping in the calculation of the stability diagram is outlined. Previously published stability diagrams of drillstrings equipped with drag bits showed decreased stability at low cutting speeds, and that the addition of a shock absorber decreased the size of stability pockets. In this paper, we show that the introduction of process damping confirms field observations of increased stability at low speeds. We also show that a properly designed shock absorber produces large stability pockets where drilling is most effective.

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Табаков, Yu Tabakov, Лавлинский et V. Lavlinskiy. « TECHNIQUE OF APPLICATION FOR PROCESSING OF LOW PASS FILTER LF SIGNALS ». Modeling of systems and processes 7, n^o 4 (24 février 2015) : 35–38. http://dx.doi.org/10.12737/7905.

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The article includes a block diagram and the mathematical model for low pass filter designed for processing low frequency signal with a frequency of 10-40 Hz in order of eliminate various noises and interference.

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Rosolen, Carlo, Alain Lecacheux, Eric Gerard, Vincent Clerc et Laurent Denis. « High dynamic range, Interferences Tolerant, Digital Receivers for Radioastronomy : Results and Projects at Paris and Nanay Observatory ». Symposium - International Astronomical Union 199 (2002) : 506–7. http://dx.doi.org/10.1017/s0074180900169670.

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Radio astronomy in the decameter to centimeter wavelength range is facing new challenges because of man made interferences due to increasing needs in telecommunications. At the Radioastronomy department of Paris Meudon Observatory, we have been working since four years on high dynamic range digital receivers based on Digital Signal Processors (DSP). The first achievement is a digital spectro- polarimeter devoted to spectroscopy of astrophysical radiation in decameter range, now in operation at the Nancay Decameter array. The block diagram of the receiver includes a high dynamic range analogue section followed by a 12 bits analogue to digital converter. The digital part makes use of high power, programmable digital circuits for signal processing, arranged in a dedicated parallel architecture, able to compute in real time the power spectrum and the correlation of the input signals. This receiver was also used, as spectrometer backend, at Nancay decimetric radiotelescope and has performed very well in the presence of very strong interferences. We are presently working on a new digital receiver with broader bandwidth. The objective is 2 × 25 MHz band with at least 60 dB dynamic range. This new receiver will use additional computation power in order to recognise and avoid man made interferences which corrupt the radio astronomical signal. At the Nancay Radioastronomy Observatory, we have started to develop a new digital configurable receiver with 8 times 25 MHz band and ten thousand channels. For low frequency radioastronomy, direct spectrum computation technique is really powerful and offers new capabilities for real time interferences excision. Fig. 1 shows pulsar observations in the presence of interference made with the DSP receiver on the UTR-2 radiotelescope. Fig. 2 shows the effect of satellite interfernce on OH observations made with the Nancay telescope. Fig. 3 shows the block diagram of the DSP system and demonstrates how offline excision of interference in the frequency time-domain enables recovery of the signal. The final spectrum had 960 minutes integration on and off source and took 8045 minutes of procession on a 450 MHz Pentium II.

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Demirbas¸, Kerim. « Trellis Representation and State Estimation for Dynamic Systems With a Kth Order Memory and Nonlinear Interference ». Journal of Dynamic Systems, Measurement, and Control 112, n^o 3 (1 septembre 1990) : 517–19. http://dx.doi.org/10.1115/1.2896175.

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A fast state estimation scheme is presented for dynamic systems with a Kth order memory and nonlinear interference. This new scheme is based upon a trellis diagram representation of dynamic models and stack sequential algorithm of Information Theory.

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Волосюк, Валерій Костянтинович, Володимир Володимирович Павліков, Семен Сергійович Жила, Анатолій Владиславович Попов, Володимир Віталійович Кошарський, Олексій Володимирович Одокієнко, Віталій Георгійович Яковлєв, Едуард Олексійович Церне, Дмитро Сергійович Власенко et Антон Дмитрович Собколов. « Оптимізація поляризаційно-доплерівської селекції малорозмірних об’єктів на тлі підстильної поверхні ». Aerospace technic and technology, n^o 6 (29 novembre 2021) : 49–61. http://dx.doi.org/10.32620/aktt.2021.6.06.

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Using the method of maximum likelihood, the optimal algorithm of polarization-Doppler selection of objects on the background of the underlying surface, hydrometeors, urban buildings from aerospace carriers of radio electronic equipment has been synthesized. To solve the problem polarimetric properties of the scattered electromagnetic radiation of natural environments and anthropogenic objects were analyzed.The functional-deterministic mathematical model of the useful signalis determined. When solving the optimization problem, the method of maximum likelihood functionality and likelihood functionality for correlated processes were used, which contains the inverse matrix of inverse correlation functions of the observation equation. The obtained signal processing algorithm includes operations of spectral resection of passive interference. Polarization compensation of passive interference is performed by a combination of interchannel subtraction of the reflected signals of different polarizations. The quasi-optimal features of the synthesized algorithm, which has an obvious physical value and is optimal in the absence of internal noise, are considered. Based on the obtained results, a block diagram of the polarization-Doppler noise compensator and selection of useful signals against the background of noise reflections from the earth's surface has been developed. The study of the physical characteristics of the elements of the polarization covariance matrix of interferences at a high level of correlation of reflections of passive interferences of different polarizations is conducted.Based on the obtained results, it is proposed to introduce indicators of efficiency of passive interference compensation and selection of useful signals. The results of the analysis of the obtained indicators depending on the coefficient of the ratio of variances of passive interference indicate the need to use the polarization differences between signals and interference for selecting objects against the background of the underlying surface. The results obtained can be used to create ground-based and aerospace-based radar systems for detecting moving objects and objects with pronounced polarization features.

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Antonov, A. S., et E. L. Kapylov. « Simulation of operation of dual-frequency antenna array of GLONASS consumer navigation equipment under influence of simulated interference ». Issues of radio electronics, n^o 3 (25 juin 2021) : 14–25. http://dx.doi.org/10.21778/2218-5453-2021-3-14-25.

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The article deals with the methods of increasing the noise immunity of the navigation equipment of the consumer under the influence of deliberate imitation interference (spoofing). The main differences between imitation interference and powerful noiselike interference are highlighted. The initial data for computer modeling of various signal-interference conditions are formed, with makes it possible to conduct a comparative analysis of various methods of interference suppression. The created model allows us to take into account the real coordinates of navigation satellites relative to the selected observation point, the geometry of the antenna array of the navigation receiver and its main functional characteristics. The possibility of using antenna arrays with a controlled diagram-forming scheme for focusing the radiation pattern in the directional of arrival of satellite navigation signals and creating a «zero» in the direction of arrival of interference is investigate. The dependence of the potential level of interference suppression on the elevation of interference arrival is analyzed. A comparison of two optimization methods used as an interference reduction algorithm is presented.

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Shadrin, B. G., V. A. Dvoryanchikov et B. S. Bogankov. « METHOD FOR INCREASING TRANSFER RATE IN HF RADIO SYSTEMS AND ITS IMPLEMENTATION (part 1) ». RADIO COMMUNICATION TECHNOLOGY, n^o 47 (23 novembre 2020) : 7–22. http://dx.doi.org/10.33286/2075-8693-2020-47-7-22.

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A method for increasing the transfer rate in HF radio communication systems is proposed, which, in comparison with existing methods, allows it to be doubled without expanding the frequency band occupied by the communication channel. The block diagram of one of the variants of the HF radio communication system that implements the proposed method is presented. The analysis of the operation of the communication system in the absence of external interference and the influence of interference concentrated over the spectrum is carried out.

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Pavlov, V. I., S. V. Artemova, T. Yu Dorokhova et V. V. Aksenov. « The Information Processing Algorithm in a Semi-Passive Homing System for Movable Objects ». Vestnik Tambovskogo gosudarstvennogo tehnicheskogo universiteta 27, n^o 2 (2021) : 185–94. http://dx.doi.org/10.17277/vestnik.2021.02.pp.185-194.

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In addition to the existing methods, a new semi-passive homing method for mobile objects is proposed; the advantages and the prospects of the developed method are discussed. A structural diagram of a semi-passive homing control system for a mobile object has been developed and the features of its functioning have been noted. A structural diagram and an algorithm for the functioning of a new block for recognizing signal-interference situations have been developed. The results of the study confirming the feasibility of developing a semi-passive homing method for mobile objects are presented.

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Popov, D. I. « The adaptive notch filter with complex weights ». Journal of «Almaz – Antey» Air and Space Defence Corporation, n^o 2 (30 juin 2015) : 21–26. http://dx.doi.org/10.38013/2542-0542-2015-2-21-26.

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Considered the criteria and algorithms to adapt FIR notch filters to the unknown spectral-correlation characteristics of clutter. On the basis of approximate models obtained clutter stable computationally adaptive algorithms of filtration data interference. The block diagram of adaptive notch filters and sliding batch processing.

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ACHASOV, N. N., et A. A. KOZHEVNIKOV. « NEW PROPOSALS FOR THE REACTION e+e−→π+π−π0 ». International Journal of Modern Physics A 09, n^o 04 (10 février 1994) : 527–45. http://dx.doi.org/10.1142/s0217751x94000261.

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The influence of the singularity of the triangle diagram on patterns of ρω interference in the π+π− mass spectrum of the reaction e+e−→π+π−π0 is considered at energies in the range [Formula: see text]. This influence arises due to the difference between the phases of the ω→ρπ and ρ→ωπ transition amplitudes implied by the imaginary part of this diagram. The decay kinematics of the triangle diagram results in the distortion of the π+π− mass spectrum. Taking this diagram into account at energies in between ω and φ peaks implies the measurable decrease of the cross section. Experimental studies of the effect of the imaginary part of the triangle diagram at e+e− colliders with the luminosity L=1031 cm −2 s −1 or higher could be of great interest as a tool for testing the self-consistency of calculations going beyond the tree approximation and as the possibility of obtaining additional information on the mechanism of breaking of the OZI rule and G parity.

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Parshutkin, Andrey, et Dmitriy Buchinskiy. « Model of Satellite Communication Channel Functioning under Conditions of Disturbances of Service Part of Frames by Unsteady Interference ». Informatics and Automation 19, n^o 5 (13 octobre 2020) : 967–90. http://dx.doi.org/10.15622/ia.2020.19.5.3.

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The paper describes the main ways of organizing modern satellite communication systems and the methods of synchronization and transmission of service information used in them, the frame synchronization mechanism from the view point of noise immunity. Based on the analysis, a block diagram of a simulation model is proposed for studying the influence of unintentional interference on the channels of modern satellite communication systems. The proposed model of the impact of non-stationary interference on a satellite communication channel takes into account the effect of interference on symbolic, frame synchronization, mechanisms for extracting frame boundaries, as well as the effect of modern error correction codes. The model allows evaluating the impact of non-stationary interference on both the information and the service side of the frame of modern systems of broadband satellite communications. As an indicator of the noise immunity of a satellite communication channel, there was used probability of frame loss, i.e. frame skipping due to a violation in the frame synchronization system, incorrect allocation of frame boundaries, or the presence of errors in the frame that were not repaired by corrective codes. Using this model, we studied the effect of non-stationary interference of various durations on the information and service parts of the frame, compared the results of the impact of non-stationary interferences of various durations with the effect of white Gaussian noise. It is shown that non-stationary interference, which are short noise pulses that do not affect the information part of the frame due to reparation by correction codes, can significantly reduce the reception quality due to disruption of frame synchronization and distortion of service information about the signal-code structure and frame length.

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Pan, Zhong Liang, et Ling Chen. « Test Method for Crosstalk Faults in VLSI Circuits Based on Multiple-Valued Decision Diagrams ». Applied Mechanics and Materials 20-23 (janvier 2010) : 641–46. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.641.

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The crosstalk fault in VLSI circuits is one of the interference effects being caused by parasitic capacitance and inductance coupling, it can lead to functional errors of circuits. It is necessary to detect the crosstalk faults in order to insure the functions of circuits. A new test method for crosstalk faults in VLSI circuits based on multiple-valued decision diagrams is presented in this paper, the test vectors of crosstalk faults are generated by building a multiple-valued decision diagram that is a difference operation of the two multiple-valued decision diagrams corresponding to the normal circuit and faulty circuit, respectively. One advantage of the test method is that it can get all test vectors of a given crosstalk fault, therefore for a digital circuit, the test set with minimal number of test vectors can be obtained. Experimental results on a lot of digital circuits demonstrate the feasibility of the method proposed in this paper.

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Kondo, Yoshiyuki, H. Eda et Masanobu Kubota. « Fatigue Failure under Varying Loading within Fatigue Limit Diagram ». Materials Science Forum 567-568 (décembre 2007) : 1–8. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.1.

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Although fatigue limit diagram is defined in principle for constant stress amplitude condition, it is often considered that fatigue failure would not occur even in varying loading if applied stresses were kept within the fatigue limit diagram. However, it was shown in the case of small-notched specimen and fretting fatigue that fatigue failure occurred in some special case of variable amplitude loading condition even when all stress amplitudes were kept within the fatigue limit diagram. The cause of this phenomenon was examined using two-step and repeated two-step stress patterns in which the first step stress was with zero mean stress and the second step stress had a high mean stress. A non-propagating crack was formed by the first step stress. This crack functioned as a pre-crack for the second step stress with high mean stress. Consequently, fatigue failure occurred even when all stress amplitudes were kept within the fatigue limit diagram. It was an unexpected fracture caused by the interference effect of non-propagating crack and mean stress change.

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Dwi Ajiatmo, Imam Robandi et Machrus Ali. « Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator ». Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan 10, n^o 1 (22 avril 2019) : 35–41. http://dx.doi.org/10.48056/jintake.v10i1.50.

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Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.

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Ajiatmo, Dwi, Imam Robandi, Machrus Ali et Betta Aidya Suroya. « Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator ». Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan 10, n^o 1 (22 avril 2019) : 35–41. http://dx.doi.org/10.32492/jintake.v10i1.793.

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Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.

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Bakhtiiarov, Denys, Oleksandr Lavrynenko, Nataliia Lishchynovska, Ivan Basiuk et Tetiana Prykhodko. « METHODS FOR ASSESSMENT AND FORECASTING OF ELECTROMAGNETIC RADIATION LEVELS IN URBAN ENVIRONMENTS ». Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska 11, n^o 1 (31 mars 2021) : 24–27. http://dx.doi.org/10.35784/iapgos.2430.

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Methods for synthesis a structural diagram of the processes for detecting and locating technical information leakage channels are analysed. Software for defining a controlled room zone was also presented. A proprietary approach to search the electromagnetic environment under radio interference has been developed to detect devices for unauthorized control of acoustic information using microphones and transmission of this information using a radio channel.

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Bucher, Manfred, et Duane P. Siemens. « Unified diagram for Fraunhofer diffraction and interference patterns from single, double, and multiple slits ». American Journal of Physics 57, n^o 10 (octobre 1989) : 902–7. http://dx.doi.org/10.1119/1.15844.

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Xu, Jiachao, Hao Shi, Fei Sun, Zehuan Tang, Shuanghuizhi Li, Dudu Chen, Tingfeng Ma, Iren Kuznetsova, Ilya Nedospasov et Chao Zhang. « High-Frequency Vibration Analysis of Piezoelectric Array Sensor under Lateral-Field-Excitation Based on Crystals with 3 m Point Group ». Sensors 22, n^o 9 (9 mai 2022) : 3596. http://dx.doi.org/10.3390/s22093596.

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Based on Mindlin’s first-order plate theory, the high-frequency vibrations of piezoelectric bulk acoustic wave array sensors under lateral-field-excitation based on crystals with 3 m point group are analyzed, and the spectral-frequency relationships are solved, based on which, the optimal length–thickness ratio of the piezoelectric crystal plate is determined. Then, the dynamic capacitance diagram is obtained by a forced vibration analysis of the piezoelectric crystal plate. The resonant mode conforming to good energy trapping is further obtained. The frequency interferences between different resonator units are calculated, and the influences of the spacing between two resonant units on the frequency interference with different electrode widths and spacings are analyzed. Finally, the safe spacings between resonator units are obtained. As the electrode spacing value of the left unit increases, the safe spacing d0 between the two resonator units decreases, and the frequency interference curve tends to zero faster. When the electrode spacings of two resonator units are equal, the safe distance is largest, and the frequency interference curve tends to zero slowest. The theoretical results are verified further by finite element method. The analysis model of high frequency vibrations of strongly coupled piezoelectric bulk acoustic array device based on LiTaO3 crystals with 3 m point group proposed in this paper can provide reliable theoretical guidance for size optimization designs of strongly coupled piezoelectric array sensors under lateral-field-excitation.

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FU, ZHIJIAN, LIZHONG YANG, PING RAO et TAOLIN ZHANG. « INTERACTIONS OF PEDESTRIANS INTERLACED IN T-SHAPED STRUCTURE USING A MODIFIED MULTI-FIELD CELLULAR AUTOMATON ». International Journal of Modern Physics C 24, n^o 04 (avril 2013) : 1350024. http://dx.doi.org/10.1142/s0129183113500241.

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Little work has been done before in the study of separating pedestrian flow interlaced. Under open boundaries, the interaction of separating pedestrian flow interlaced in a T-shaped structure was simulated, using a modified multi-field cellular automaton updating synchronously. The free-jammed phase transition diagram of pedestrian flow and principles of the pedestrian interference were obtained. The movement of pedestrians is free flow in the low entrance density. While it is a complete jammed flow with the entrance density increasing to a certain level and little difference existing between the left moving probability and the right moving probability. Thus, the dominant factor influencing pedestrian flow is the interference of opposite pedestrian flows due to changing movement directions. And it is changing to an incomplete jammed flow with this difference increasing. Thus, the dominant factor is changing to the interference of the coincident pedestrian flow and the limitation of the bottleneck.

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Zhou, Mingjian, Yuqin Wang et Haibing Wu. « Control Design of the Wave Compensation System Based on the Genetic PID Algorithm ». Advances in Materials Science and Engineering 2019 (17 septembre 2019) : 1–13. http://dx.doi.org/10.1155/2019/2152914.

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The transfer function of the wave compensation system is deduced. The interference signal acting on the system is eliminated by the feed-forward compensation correction method. The pole assignment of the system is carried out after eliminating the interference signal. The genetic PID algorithm is proposed, and the genetic PID controller is designed. The control block diagram of the wave compensation system based on the genetic PID control algorithm is established, and the optimal index and PID parameters are optimized by the crossover and mutation operators of the genetic particle swarm optimization algorithm. The simulations and experiments of the system show that the control performance of the wave compensation system based on the genetic PID algorithm is greatly improved. The higher control precision is obtained. The anti-interference ability and the robustness of the system are increased. The accuracy of the control method is verified.

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Mao, Jian Guo, et Han Quan Wang. « Development on an Acquisition and Analysis System for Indicator Diagram of Piston Engine ». Applied Mechanics and Materials 475-476 (décembre 2013) : 268–72. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.268.

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An acquisition and analysis system for indicator diagram (ID) of piston engine is developed for monitoring the cylinder pressure in engine development. The hardware component of the data acquisition system is introduced. The method of the determination of the TDC, the method of filtering the interference signal of ID and the method of implementation with Visual C++ are presented. The system can provide ID online through the experiment on Honda 125 engine. It can directly and conveniently display the information about combustion. Therefore it has a high potential value in engineering applications.

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BOIKO, JULIY, ILYA PYATIN et IGOR PARKHOMEY. « SIGNAL PROCESSING AND SYNCHRONIZATION TECHNIQUE IN SOFTWARE-DEFINED RADIO SYSTEMS WITH OFDM ». Herald of Khmelnytskyi National University. Technical sciences 307, n^o 2 (2 mai 2022) : 123–32. http://dx.doi.org/10.31891/2307-5732-2022-307-2-123-132.

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The article describes modern concepts for the development of Software-defined Radio (SDR) technology. A functional diagram of a software-defined radio station using the method of transmitting information with modulation based on Orthogonal Frequency Division Multiplexing (OFDM) is proposed. The conditions for ensuring symbol synchronization of OFDM signals are investigated. It is determined that the disruption of the orthogonality of OFDM symbols is accompanied by such phenomena as the occurrence of inter-symbol interference and inter-channel interference. The method of constellation diagrams was used to study the effect of errors caused by interference on the quality of processing of multiposition signals. The effect of interference in a channel from OFDM on the phase of signals during their processing is estimated. Mathematical models of signals with OFDM in the presence of interference effects are obtained. Two types of errors are considered, which are caused by carrier distortion. In particular, the occurrence of phase noise is possible, the cause of which is associated with the instability of the generating equipment of the carrier signals both on the transmitting and on the receiving side. Another factor is carrier offset due to Doppler frequency. The proposed SDR receiver structure is based on the digital IF architecture. This architecture has more flexibility than traditional RF architectures and is not sensitive to DC offset, LO leakage, etc. Moreover, since the I/Q up/down conversion is done digitally in the IF stage, the negative effects caused by I/Q imbalance will be minimized. The SDR consists of a small piece of hardware at the RF input, i.e., an antenna and a high-rate ADC capable of capturing and digitizing broadband radio signals. To increase the communication range in SDR, we use amplifiers in front of two DAC/ADC stages. The receiver has a low-noise amplifier to reduce the quantization noise of the transducer and increase the Signal-to-noise Ratio (SNR). The data is then processed on specialized computational units within the embedded system, enabling important demodulation, synchronization, and decoding techniques to be implemented.

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Wu, Chun Li, Han Bing Liu et Yan Li. « Sensor Optimal Placement for Structural Health Monitoring Based on Stabilization Diagram ». Key Engineering Materials 540 (janvier 2013) : 47–54. http://dx.doi.org/10.4028/www.scientific.net/kem.540.47.

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A novel stabilization diagram method was presented for sensor placement in structural health monitoring of bridges. The aim of the method is to select the optimal locations which can achieve the best identification of modal frequencies and mode shapes. A single parents genetic algorithm was adopted to optimize the sensor locations from a set of coordinate positions. Five fitness functions taken as the objective function are proposed based on effective independence, modal assurance and modal energy criterion, in which the combined fitness functions can obtain more comprehensive properties to reduce the noise interference. The proposed method puts forward a universal way for sensor placement of the civil engineering structure. The effectiveness of the method was proved by a simply supported beam and a continuous beam bridge in the An Longquan interchange overpass.

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Mondal, Subhadip, Sayan Ganguly, Mostafizur Rahaman, Ali Aldalbahi, Tapan K. Chaki, Dipak Khastgir et Narayan Ch Das. « A strategy to achieve enhanced electromagnetic interference shielding at low concentration with a new generation of conductive carbon black in a chlorinated polyethylene elastomeric matrix ». Physical Chemistry Chemical Physics 18, n^o 35 (2016) : 24591–99. http://dx.doi.org/10.1039/c6cp04274k.

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Khudov, Hennadii, Igor Ruban, Oleksandr Makoveichuk, Yevhen Stepanenko, Irina Khizhnyak, Sergey Glukhov, Olesya Symkanych et al. « Improved Imaging Model in the Presence of Multiplicative Spatially Extended Cloaking Interference ». International Journal of Emerging Technology and Advanced Engineering 11, n^o 11 (13 novembre 2021) : 189–98. http://dx.doi.org/10.46338/ijetae1121_22.

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The paper proposes an improved imaging model in the presence of multiplicative spatially extended cloaking interference. The model take into account the effect of multiplicative masking interference. To simplify the calculations of the image brightness in the distorted region the diagram technique is used. Unlike the known ones, the model takes into account the concentration of the distorting medium in a narrow squat layer, the primary reflection of solar radiation from the upper boundary of the distorting layer and subsequent multiple re-reflections of the transmitted radiation of the visible wavelength range from the earth’s surface and the upper boundary of the distorting medium layer. A technique for finding and taking into account the reflection and re-reflection coefficients of radiation to restore distorted images is proposed. The results of experimental studies are presented. For the experiment, the image of the territory of Iraq during the 2003 "Freedom for Iraq" hostilities was selected. Keywords— image, model, multiplicative, extended cloaking interference, spacecraft, reflection, coefficient

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Upadhyay, R. K. « Chaotic Dynamics in a Three Species Aquatic Population Model with Holling Type II Functional Response ». Nonlinear Analysis : Modelling and Control 13, n^o 1 (25 janvier 2008) : 103–15. http://dx.doi.org/10.15388/na.2008.13.1.14592.

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A three-trophic model for marine community is proposed and investigated by means of numerical bifurcation analysis. The proposed model based on a modified version of the Leslie-Gower scheme, incorporates mutual interference in all the three populations and generalizes several other known models in the ecological literature. We investigate the dynamical behavior of the model system by considering the Holling type II functional response of toxin liberation process. Bifurcation diagram and two-dimensional parameter scan suggest that chaotic dynamics is robust to variations in toxin production by phytoplankton. Our study suggests that toxic substances released by TPP population may act as bio-control by changing the state of chaos to order. The mutual interference also induces chaos and acts as both stabilizing and destabilizing factors.

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Chen, Min, Wen Bing Lu, Chong Zhang et Liang Zhang. « Research on TWACS Interference Suppression Based on the RLS Algorithm ». Applied Mechanics and Materials 229-231 (novembre 2012) : 1560–63. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1560.

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TWACS (Two Way Automatic Communication System) has advantages such as economical and practical use, strong interference capability, long transmission distance and so on. But the noise in China's industrial distribution power grid owns the characters of strong interference randomness and even annihilation of the modulated signal. So the noise has a negative impact on power line communication performance. While the adaptive filter does not need to know in advance on the statistical characteristics of the input signal and noise, and has nothing to do with the spectral characteristics of the input signal. Based on this, it’s premised that the modulation signal is basically known, and the signal beyond modulation domain is regarded as reference signal to design an adaptive filter applied to TWACS by referring to the block diagram of the adaptive filter model to adjust the variable parameters of the RLS algorithm. Finally, the field test signal simulations show good effect of the adaptive filter design

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Sadchenko, A. V., O. A. Kushnirenko et E. K. Koshelev. « Anti-interference pulsed laser ranging system ». Технология и конструирование в электронной аппаратуре, n^o 1-2 (2020) : 8–14. http://dx.doi.org/10.15222/tkea2020.1-2.08.

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Pulsed laser rangefinders prove to be cost-effective and practical devices when used at distances of several tens of kilometers due to their compactness, portability and energy efficiency. However, the measurement accuracy is significantly reduced by the presence of pulsed interference affecting the input of the optical receiver both during the sensing period and when the reflected signal is being received. Using the algorithms with the accumulation and subsequent processing of the results of several successive measurements reduces the speed of decision-making and does not guarantee the convergence of the results to the real value of the distance. The paper proposes a structural diagram of a laser rangefinder with the ability to detect pulsed interference in the range interval and correct errors that occur in the structure of the signal reflected from the target. The basis of the rangefinder circuit is a logical consistent filter, the structure of which contains multipliers (multiplication operations). The following requirements were formulated for the structure of the probe signal: — the first element should always be set to +1 to synchronize the receiver decider; — the weight of the coding sequence is equal to half its length; — the length of the coding sequence is even. Based on the requirements for coding sequences, the optimal structures of binary probing signals of length 8 were found, providing the best corrective ability. Comparison of the correlation properties of the found sequences and the sequences that are constructed using the Walsh functions showed the advantage of the optimal sequences by the criterion of the minimum level of the ACF side lobes. The simulation of the rangefinder under pulsed noise conditions has shown that the logical filter is advisable to use for those cases when the duration of the obstacle does not exceed 1/3 of the duration of the probing signal.

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Fakher, Abolqassem, Falih Alnahwi et Majid Alwan. « Performance Evaluation of OFDM System with Insufficient CP Using LMS Equalizer under Harsh Multipath Conditions ». Iraqi Journal for Electrical and Electronic Engineering 15, n^o 2 (1 décembre 2019) : 122–29. http://dx.doi.org/10.37917/ijeee.15.2.13.

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This paper presents an insufficient cyclic prefix (CP) Orthogonal Frequency Division Multiplexing (OFDM) system with equalizer whose coefficients are calculated using Least Mean Square (LMS) algorithm. The OFDM signal is passed through a channel with four multipath signals which cause the OFDM signal to be under high inter-symbol interference (ISI) and inter-carrier interference (ICI).8-QAM and 16-QAM digital modulation techniques are used to evaluate the performance of the proposed system. The simulation results have accentuated the high performance of the LMS equalizer via comparing its Bit Error Rate (BER) and constellation diagram with those of the Minimum Mean Square Error and Zero Forcing equalizers. Moreover, the results also reveal that the LMS equalizer provides BER performance close to that of the OFDM system with a hypothetical sufficient CP.

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Garkusha, V. V., S. S. Zhuravlev, S. R. Shakirov et V. V. Yakovlev. « Debugging Complex with Simulation of Conductive Interference for Testing Automated Control System Controllers ». Vestnik NSU. Series : Information Technologies 20, n^o 3 (12 février 2023) : 14–28. http://dx.doi.org/10.25205/1818-7900-2022-20-3-14-28.

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The paper presents a full-featured simulation debugging system designed to test programmable controllers for automated process control systems in the laboratory. This system imitates the operating conditions of the automated process control system, as close as possible to the real operating conditions at the automation object. The presented system can form various levels of interference of input signals, inﬂuencing the automatic process control system with high-intensity network and impulse noise. The system also allows one to vary the parameters of the communication line. The structure of the conducted interference generator and the variator of the communication line parameters have been developed. A description of all elements necessary for modeling the main types of interference is given. In this work, an analysis of the existing electromagnetic interference in the signal circuits of process control systems was carried out, and the most typical interference was identifed. A block diagram of a conducted interference generator and a variator of communication line parameters has been developed. Both functional blocks are part of the modeling and debugging complex. They allow one to simulate the interference environment for the controller under test by introducing the generated interference into the signal communication lines in a conductive way. The structure of the adapter-former of interference for analog signals is worked out in detail with a description of its main components. Recommendations for choosing the element base are given. The practical signifcance of the performed work lies in the fact that it may improve the efciency of the complex of control and laboratory tests of the systems being created. This allows one to achieve a reduction in complexity and in setup time during implementation at the automation facility

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Welti, R. « Interaction between sources and the superposition principle in interference phenomena ». Journal of Optics 23, n^o 12 (3 novembre 2021) : 125603. http://dx.doi.org/10.1088/2040-8986/ac2fd1.

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Abstract In the explanations of the double slit experiment it is usually assumed that the superposition of the diffracted waves by two separate slits (one open and another closed) is the same as superimposing the diffracted waves when both slits are open at the same time. This naïve use of the superposition principle is generally not valid in either classical electromagnetism or quantum mechanics. As we will see, the diffraction diagram of one of the slits is altered when the other is open and when the slits are closer, the interaction between them is greater. In this work we will analyse the interaction between different types of sources (antennas, loudspeakers and, of course, slits) and we will show how this interaction explains the apparent anomalies in energy conservation and also the recent results of Young’s interference that show that the total diffracted intensity is reduced or increased depending on the distance between the slits. We also make a brief comment on the contributions of our work to the supposed looped trajectories of energy in interference phenomena.

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Wang, Weilin, Keyan Li, Zhihao Yang, Jun Chen, Linliang Miao, Jun Ouyang et Xiaofei Yang. « An Adaptive Alternating Magnetic Interference Suppression (AAIS) Algorithm for Geomagnetic Vector Measurement ». Sensors 22, n^o 10 (10 mai 2022) : 3642. http://dx.doi.org/10.3390/s22103642.

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To achieve high-precision vector measurement values in a geomagnetic field, it is necessary to develop methods for overcoming alternating magnetic interference (AMI), which is generated by electrical equipment. This paper proposes the adaptive alternating magnetic interference suppression (AAIS) algorithm. In this algorithm, first, only a triaxial fluxgate sensor measures the magnetic field data. The time–frequency diagram of the total magnetic field is obtained quickly through short-time Fourier transform and wavelet transform. Additionally, the time and frequency of AMI appearance are analyzed. Then, the triaxial adaptive notch filter suppresses the three-component related magnetic interference. Herein, simulation and actual experiments are performed to verify the effectiveness of AAIS. The results indicate that the algorithm can quickly detect the frequencies of AMI from the total magnetic field and adaptively fit their amplitude and phase on the vector magnetic field. Finally, AAIS can suppress the interference effectively. The AAIS algorithm realizes error compensation for the vector measurement values by the total magnetic field, which effectively improves the vector measurement accuracy of the geomagnetic field. We highlight that the AAIS algorithm is effective for AMIs of different frequencies, numbers, and intensities without reference sensors. Our work has practical implications in airborne, vehicle-mounted, and shipborne geomagnetic vector detection.

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Panchenko, Sergii, Olha Ananieva, Mykhailo Babaiev, Mykhailo Davidenko et Vladyslav Panchenko. « Synthesis of a device for anti-jamming reception of signals of tonal rail circuits on the background of additive five-component interference ». Eastern-European Journal of Enterprise Technologies 3, n^o 9(111) (30 juin 2021) : 94–102. http://dx.doi.org/10.15587/1729-4061.2021.235835.

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An optimal receiving device for information signals of tonal rail circuits has been synthesized. The signals are observed against the background of an additive five-component interference. The first component of the interference is broadband Gaussian noise. The other four components of the interference are structurally determined: single impulse interference, interference from an adjacent tonal rail circuit, and multiharmonic interference from alternating traction current combined with the power line and from the locomotive traction converter. The presence of a complex of interference leads to errors in decision-making regarding the regulation of train traffic. This puts the participants in this movement before the danger of threatening emergencies. Therefore, it is necessary to develop and study means of noise-immune reception of information signals and the formation of dispatch decisions. The decision on the presence or absence of a signal is made by comparing two values of the mean square of the approximation error. This error is understood as the difference between the input voltage of the receiver and the sum of the signal with structurally determined interference. The first value of the error is calculated assuming the presence of a signal in a mixture with structurally determined noise. The second error value is calculated on the assumption that there is no signal in this mixture. The noise component is assumed to be present in both cases. The solution corresponds to a channel with a lower mean squared error. The block diagram of the device is presented. Analytically, it has been shown that the average value of the error in recognizing situations of presence or absence of a signal is two orders of magnitude less than the admissible value according to regulatory requirements. High noise immunity of the developed device will improve the safety of train traffic

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Yi, Yang, Xiaojun Liu, Zhonghua Ni, Xia Tang et Xiaokang Xu. « Research Method of Assembly Sequence Planning Based on Assembly Constraint Relationship Analysis ». MATEC Web of Conferences 237 (2018) : 03005. http://dx.doi.org/10.1051/matecconf/201823703005.

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In order to effectively reduce the human-computer interaction (HCI) workload before the assembly process simulation in the digital assembly environment, and to enhance the intelligence of assembly sequence planning, we introduce the assembly constraint relationship into the automatic generation of assembly sequences and propose a practical assembly sequence planning method for intelligent assembly. Firstly, starting from the assembly geometry model, an assembly model liaison graph is constructed by combining the analysis of assembly constraint relationship and the definition of disassembly direction rules. Then, according to the liaison graph, disassembly priority constraint matrix based on constraint relationship is constructed, and the automatic generation and dynamic update of the disassembly priority diagram can be realized by the definition of disassembly doubly linked list. According to the diagram, the rationality of the disassembly sequence is determined through the interference check analysis, and then the assembly sequence is automatically generated from the reversed disassembly sequence. Finally, the method in the text is verified by an example case study.

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Peiyong, Li, Cui Jin, Gao Feng, Wang Chengfang, Mao Yunsheng et Liao Guohong. « Research on the Assembly Sequence of a Ship Block Based on the Disassembly Interference Matrix ». Journal of Ship Production and Design 31, n^o 04 (1 novembre 2015) : 230–40. http://dx.doi.org/10.5957/jspd.2015.31.4.230.

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Reasonable optimized block assembly sequence has vital practical significance for ship construction, and the research has been done in this article at the aim of obtaining optimal assembly sequence. First, taking a double-bottom block as the object of study, by analyzing the connection relationship between each part, a disassembly network diagram and disassembly interference matrix can be generated by applying the demolition method. Based on the disassembly interference matrix, disassembly sequence can be generated according to certain rules, then the assembly sequence is the invert of disassembly sequence; next, considering comprehensively the part's physical attribute affecting the assembly sequence, the final assembly sequence can be obtained for two assembly ways using the analytic hierarchy process; lastly, DELMIA software is applied to implement the virtual simulation of the assembly process in accordance with the assembly sequence. The work of the article is of certain guidance significance to parts assembly in ship production and can lay a good foundation for realizing the ship block's digital assembly.

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Liu, Tong. « Research on stability of hydraulic system based on nonlinear PID control ». Nonlinear Engineering 11, n^o 1 (1 janvier 2022) : 494–99. http://dx.doi.org/10.1515/nleng-2022-0222.

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Abstract In order to avoid the interference of the excavator hydraulic control system by external factors, the output stability of the hydraulic control system has to be improved. The method introduces a nonlinear Proportional integral differentiation (PID) controller with deviation correction parameters through the simulation verification of the control effect and the creation of excavator hydraulic drive diagram. PID, whose full English name is proportional integral derivative, is a mathematical and physical term. The controller is modeled in Matlab/Simulink. Finally, the whole hydraulic system is co-simulated by the interface of AMESim and Matlab. The simulation results show that the system model realizes the co-simulation through the interface combination of the two software, which is more accurate than the traditional PID control, and the pressure and flow fluctuation are smaller, which can suppress the interference of external load mutation, and improve the stability of the hydraulic drive output of the excavator. The validity of the experiment is verified.

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Ma, Hong Jiao, Meng Li, Kang Wang et Zai Ming He. « Adaptive Beam Forming Algorithm of Anti-Jamming GNSS Terminal Research ». Advanced Materials Research 905 (avril 2014) : 591–94. http://dx.doi.org/10.4028/www.scientific.net/amr.905.591.

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A variety of high-density and strong signal electromagnetic jamming and interference effect is one of the difficult problems which have bad effects on the accuracy of GNSS Satellite navigation receivers. For different types of jamming and interference effect, this paper will analyze their corresponding coping strategies on GNSS satellite navigation terminal. On the structure basis of the smart antenna array, the algorithm flow of LMS, RLS and CMA are analyzed and the simulation of these three classic beam forming algorithm are also performed. The comparison result of the convergence curves output and convergent beam directional diagram shows that all of them can extract the useful signal from the interfering signals. RLS algorithm has a better setup speed and convergence rate, and also has a strong adaptability to non-stationary signals. Therefore, its filtering performance is significantly better than LMS and CMA. But due to its high computational complexity, real-time processing is very hard to achieve.

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Narytnik, Teodor, Volodymyr Prysiazhnyi, Segii Kapshtyk, Maksym Denysenko et Oleksandra Narushkevych. « IMPROVEMENT OF THE GPS SIGNAL RECEIVING RESISTANCE AGAINST ELECTROMAGNETIC INTERFERENCE, JAMMING, AND SPOOFING IS BASED ON THE USE OF THE ANTENNA ARRAY SYSTEM WITH DIGITAL BEAMFORMING AND NORAD TLE INFORMATION ». Information and Telecommunication Sciences, n^o 2 (19 décembre 2022) : 4–14. http://dx.doi.org/10.20535/2411-2976.22022.4-14.

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Background. Currently, in radio navigation systems of the various purposes, the urgent issue is stability increase of the GPS signal reception under such a jamming and spoofing types of the interference influence. In this article, the authors propose a new solution to the stability increase problem of the GPS signal reception against the jamming and spoofing interference based on the spatial selectivity of the receiver antenna. Spatial selectivity is provided through the integrated application of phased array digital beamforming technology and the use of the TLE NORAD information. Objective. The research goal is to develop a methodology for the integrated identification of interference sources to the radio navigation system and to increase the noise immunity for receiving radio navigation signals via spatial selection through the digital beamforming technologies utilization. Methods. For the research process, theoretical methods for the digital beamforming of receiving phased antenna system were used as well as the description of a two-line NORAD information element content, and calculation algorithms for the spacecraft current position. Results. As a result of the research, the GPS signal reception model was formed using spatial selection of GPS signal sources and interference sources, the technique to increase the stability of GPS signal reception under the jamming and spoofing types of interference influence was developed, the block diagram was suggested for the receiving device that implements the developed technique through the integrated application of the digital beamforming technology of the phased array antenna and the TLE NORAD information utilization. Conclusion. A conceptual idea of the method and a technical solution for the proposed method implementation were submitted. The method implementation will improve the stability of GPS signal reception under the influence of jamming and spoofing types of interference.

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Ye, Yuan, Ling Fu, Zhang Junhua, Wei Wang, Liu Yanbin et Bin Wu. « Research on Precise Flow Control and Anti-interference Performance of Load Sensitive Multi-way Valve with After-valve Compensation ». Journal of Physics : Conference Series 2419, n^o 1 (1 janvier 2023) : 012065. http://dx.doi.org/10.1088/1742-6596/2419/1/012065.

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Abstract Regarding a load-sensitive system with after-valve compensation, in the case of a single action or composite action, theoretically, the flow of each channel neither varies with the load pressure of this channel, nor is it affected by the flow of other channels, and the anti-interference performance is good. In fact, due to the influence of factors such as the flow passage of the valve body, the matching between the pressure compensation valve and the main spool, its flow control and anti-interference performance are difficult to achieve good results, which has a great impact on the synchronization, rapid action impact and micro motion characteristics of the main engine of construction machinery. This paper studies the simplification and analysis of the system pressure drop diagram, the matching characteristics between the pressure compensation valve and the main valve, accurate modeling and simulation technology, solves the problems of flow fine control and anti-interference performance, improves the flow control accuracy of a single action and compound action, and enhances the anti-interference performance. The real vehicle test shows that the self-developed multi-way valve for compensating for load sensitivity behind the valve is installed on the 6T small excavation. The initial position of the excavator’s track is aligned along a straight line. After the test runs for 20 meters, the track offset is measured. The fast forward offset is only 20mm, and the slow forward offset is only 7mm.

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Lin, Yue-Der, Ya-Hsuech Chien, Shih-Fan Wang, Cheng-Lun Tsai, Hen-Hong Chang et Kang-Ping Lin. « IMPLEMENTATION OF MULTIPLE-CHANNEL CAPACITIVE ECG MEASUREMENT BASED ON CONDUCTIVE FABRIC ». Biomedical Engineering : Applications, Basis and Communications 25, n^o 06 (décembre 2013) : 1350052. http://dx.doi.org/10.4015/s101623721350052x.

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Capacitive electrocardiogram (cECG) measurement is an attractive approach for long-term health monitoring. However, there is little literature available for the implementation of multiple-channel cECG system in standard limb leads. The circuit diagram for such a system is also rarely available in literature. This paper presents a multiple-channel limb-lead cECG system that utilized conductive fabrics as the capacitive sensors. The design criteria and the corresponding circuit diagram are described in detail. The proposed system also incorporates the capacitive driven-body (CDB) circuit to reduce the common-mode power-line interference (PLI). The presented system is verified to be stable by theoretic analysis and long-term experiments. The signals acquired by the presented system are competitive with those by commercially available electrocardiogram (ECG) machines. The feasible size and distance to the subject for the sensor made by conductive fabric have also been evaluated by a series of tests. From the test results, the sensor is suggested to be of greater than 60 cm2 in area and not more than 3 mm in distance for cECG measurement.

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Mytsenko, I., et D. Khalameyda. « Experimental study of a frequency discriminator with input signal level compensation ». RADIOFIZIKA I ELEKTRONIKA 25, n^o 4 (2020) : 80–85. http://dx.doi.org/10.15407/rej2020.04.080.

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Subject and Purpose. Answering the need for powerful high-frequency signal generation and desired radar range provision, pulsed magnetrons hold the current lead as part of radar transmitters. Yet there are some disadvantages, such as significant noise level and technological difficulties concerning the frequency tuning implementation. In this connection, a direct control of the pulsed magnetron frequency with the use of the Automatic Frequency Control (AFC) causes problems. And in the receiver, the AFC of the heterodyne rather than of the magnetron is more frequently used. The heterodyne frequency is maintained at such a level that the receiver is always tuned to the frequency of signal to receive. For various signal generation arrangements, the existing methods of frequency tuning with a frequency discriminator will be analyzed towards the following development of a principal electrical schematic diagram with gaining the operating characteristics of the frequency discriminator prototype on that diagram basis. Methods and methodology. The electrical schematic diagram is developed in terms of intuitive approach and analyzed by the mathematical modeling method. Results. The functional scheme of a frequency discriminator combining advantages of both single-cycle circuit (design simplicity and ease of tuning) and two-cycle circuit (null output voltage at a given frequency of the input signal and compensation possibilities as to the input voltage amplitude varying and interference) has been developed. The principal electrical schematic diagram of this new frequency discriminator has been reported together with the measured amplitude and frequency characteristics, dynamical figures, etc. Conclusions. The novelty of the proposed concept of a heterodyne AFC system built around a frequency discriminator has been confirmed. Its advantages over the known solutions have been shown.

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