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The ladder filters based on microelectronic BAW resonators with a Bragg reflector are designed. The BAW resonator represents a piezoelectric transducer based on zinc oxide films with thin-film electrodes of aluminum films and a Bragg reflector consisting of four pairs Mo-Al and one pair Mo-SiO2. The ladder filter topology based on the single T-shaped link consisting of three SMR is presented. The...
The method of adaptive compensation of echoes in the range of significant delay values of telecommunication systems of loudspeaker communication is investigated. It is shown that it is possible to ensure a high rate of convergence and a high degree of echo cancellation in the formation of adaptive filtering in a localized neighborhood of delays.
The method of realization log-periodic vibrator antennas in asymmetrical execution is shown in the work. The method is based on a two-wire collecting line of four conductors with alternating polarity. The proposed construction of a log-periodic antenna made it possible to form a plane of symmetry and a connection of vibrators on each of the conductors of the same polarity. Thus formed the structure...
This paper describes the possibility of developing the gradient meter of magnetic field strength. N-germanium oscillistor is used as the magnetically sensitive converter. The experimental and theoretical studies results of the threshold value of magnetic field strength and dependence the oscillistor oscillation frequency on magnetic field strength are described in the paper. The scheme of the magnetically...
In this paper we overview the modern forecast methods of monthly sunspot numbers, such as McNish-Lincoln and Hathaway-Wilson-Reichmann standard curve-fitting. Their disadvantages are presented, leading us to the necessity of researching a new technique for the solar activity prediction. For the long-term forecast we propose to use the established nonlinear dynamo model based on negative effective...
The mathematical model of an acoustic field formed in an acoustic chamber with a noise-protective baffle is proposed. According to the experimental data, an analytic function that approximates the signal power spectrum at the receiving point is found. The parameters of the function that provide the best approximation for the given geometric dimensions of the resonator and the source signal frequency...
The paper deals with the estimation method of a carrier and time of arrival by chirp-like phase-coded sequence. The developed estimation method of the carrier and time of arrival is suitable for primary synchronization upon signal detection in phase and frequency modulation modems. This method is of less computational complexity relative to the realization of matched filter assembly. To implement...
The article compares the centrifugal pumping units electric drive dynamic characteristics at different rotational speeds of the main magnetic field. The tooth harmonics order is determined by the number of stator slots, which depends on the main magnetic field rotation frequency. Proposed mathematical model takes into account the tooth harmonics of the electric motor and the hydraulic parameters of...
We present Geographic Information System model, which is developed on the basis of metasystem approach and it is focused on application as monitoring system of complex object. The model is described on the basis of set-theoretic approach, functions according to scenarios, integrates, processes and monitors the space-time and coordinate information. The problem of acquisition and reversible compression...
The paper deals with the issues of measurement traceability based on uncertainty of measurements as an integral part of specific measurement technologies based of new information system. A short review of papers devoted to measurement traceability problem in modern conditions is described. It is proposed to further expand a concept of "special technical means" in carrying out of measurements...
The comparative analysis of the efficiency of processing of signals information parameters by the discriminators of tracking meters when exposed non-Gaussian broadband and band-limited noise is carried out. It is shown that when band-limited noise influences the discriminator, the efficiency of non-linear processing is higher and it the band-limited path and it increases with the increase of the signal/noise...
This article presents the results of the magneto-electric machine's research of the wind energy conversion systems' (WECS) alternating current. Calculation of the researched machine was carried out with the latest version of the programs "Elcut 6.2 Professional" complex using. The operation's purpose was creation of the researched object's adequate geometric model, obtaining the machine's...
The article describes the hardware architecture of computational units for the construction of GLONASS / GPS navigation user equipment. The described possible route to improve of some architectures based on field programmable gate arrays (FPGAs).
This paper describes the experimental study of a synchronous magnetoelectric generator which magnetic system is based on the asynchronous motor: the stator of magnetoelectric generator is made up of induction machine with a number of poles pairs 2p=12, a cylindrical inductor (rotor) is composed of permanent magnets distributed on the rotor surface. The modeling of magnetic system was carried out using...
Results of the investigations of the turn of meander microstrip delay line in the frequency domain are presented. Computational and full-scale experiments were used as the methods for investigation. Firstly, the results of the preliminary optimization of the geometrical parameters of the turn for the matching with measuring channel are presented. Secondly, the simulation of the frequency dependence...
The development of element base and manufacturing technologies is always one of the important scientific and technological issues. Both the search for the latest technical solutions and the improvement of known devices remain relevant. These trends are also true for permanent magnet motors used as a propulsion system for an unmanned aerial vehicle. The purpose of the research is to calculate and model...
The paper presents a continuous comparison comparator as an IP block. The comparator is developed in a standard semiconductor manufacturing process of 180 nm and can be applied in the design of system-on-a-chip devices, a dual-slope ADC in particular. This ADC can be used in the design of multimeters, digital thermometers, and other devices. The comparator is modeled in Cadence software. The result...
In the study both of the screen conductive ink multilayer printing process on polymer substrates, and layers parameters dynamics at a curing production stage for portable communication devices and solar batteries manufacturing are presented. The multipurpose "conductivity-adhesion" estimation method for polymer compositions prints with special test object exemplified by graphite dispersion...
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