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scientific edition of Bauman MSTUSCIENCE & EDUCATIONBauman Moscow State Technical University. El № FS 77  48211. ISSN 19940408
Radio Engineering and Communication
Formation of the Synchronous Chaotic Response to a Phaselocked Loop
# 07, July 2012 DOI: 10.7463/0712.0420444 The authors investigated the possibility of obtaining a synchronous chaotic response to the signal generated by PLL using extended Kalman filter. The mechanism of onset of chaos in PLL system with 2nd order astaticism was studied. The domains of stable generation of chaotic signal were obtained. By varying time update equation parameters for various SNR and sampling periods, the quality of signal recovery was investigated by using extended Kalman filter.
7730569/400050 Research of influence of smart jamming on error probability of directsequence spreadspectrum systems at coherent reception
# 04, April 2012 The aim of the study was analysis of error probability of directsequence spreadspectrum systems under condition of smart jamming and noise in communication channel. The research was based on broadband systems of coherent reception with opposite and orthogonal signals. In the total the authors obtained expressions for definition of error probability at reception of signals depending on the degree of mutual correlation of smart jamming and a useful signal, parity of their powers and noise level in the channel. The results of the research can be used for analyzing and calculating error probability of directsequence spreadspectrum systems with smart jamming and noise.
7730569/373951 High efficient pumping sources for pulse semiconductor laser bars
# 04, April 2012 Nowadays progress in laser technology is determined by the progress in laser diode pumping. Modern power supply for diode lasers must provide stable output impulses, suppress reverse current surges and maintain stable temperatures of diode arrays. Interchannel interference and noise immunity problems arising during generation of current impulses were solved. An automated laser test bench was developed; it included a special microprocessorbased circuit to control operation of the pumping source. A scheme of a temperature maintenance channel was developed along with s special regulation algorithm, which allowed to stable laser radiation at frequencies from 30 to 50 Hz with the longest possible impulse lengths. The developed multichannel pulseperiodic pumping source for diode bars generates current impulses with frequencies up to 50 Hz and durations between 60 and 500 microseconds. The running current of laser diodes can be as high as 250 Amps. Instability of current from impulse to impulse is lower than 0,5 %. Several implemented protection features (both hardware and softwarebased) along with modular design increase reliability of the pumping source. The pumping source was used to conduct experimental researches of new laser quantrons with semiconductor pumping developed at The Radioelectronic Technology Research Institute. The latter experiments resulted in some unique findings.
7730569/352332 Influence of RLC laser parameters on data transmission speed in highpower optical transmitters
# 03, March 2012 This article describes a method of increasing the data transmission speed in open optical communication lines, namely the method of increasing the current modulation frequency of a powerful semiconductor laser. In this paper it is shown how the laser case influences the speed of data transmission; the advantage in transmission speed when using the laser in a smaller package is also shown. The authors propose new methods of measurement and calculation of the RLC laser emitter parameters; equations for calculation of the RLCparameters with known values of the impedance, as well as the calculated values of RLC parameters for two investigated lasers are also given in the article. Quantitative estimations of the influence of RLC parameters on the bandwidth of the laser are included in the conclusion.
7730569/293090 Algorithm of maintainability of maneuvering targets with account taken of signal preprocessing
# 01, January 2012 The authors present an algorithm of maneuvering targets maintainability; the algorithm uses signal preprocessing data of radartracking information for detection of the beginning and the end of the maneuver. Information about the beginning and the end of the maneuver consists in changing the spectrum width of the received signal. The authors propose an algorithm for estimation of spectrum width of the maneuvering target, and study its characteristics. The authors draw a comparison of characteristics of the offered algorithm with a wellknown algorithm which uses information about discrepancy between measured and filtered parameters for maneuver detection. Simulation results characterizing efficiency of algorithm are presented. Research methods are: mathematical synthesis and mathematical simulation. Application domain – pulseDoppler radar stations.
7730569/293307 Modified algorithm of compensation of interferences for pulsedDoppler BRLS on the basis of direct calculation of weight coefficients
# 01, January 2012 The article describes an algorithm for compensation distortions in sidelobes of a beamformer. Due to using received signal redundancy in frequency domain the algorithm doesn’t need any extra time for adaptation when the signaldistortion situation changes. The algorithm could be applied in multichannel pulse Doppler radars. The research was based on linear algebra and mathematical modeling.
7730569/293828 Ensembles of GMW sequences for systems with code channel separation
# 01, January 2012 The article considers software implementation and evaluation of properties of one of the classs of nonlinear sequences  GMW sequences for use in CDMA communication systems with code division multiplexing.
7730569/290967 Research of interference immunity of communication system with frequency modulated signal and modulation index mismatch in case of coherent reception
# 01, January 2012 Influence of error in modulation index on error performance of a communication system is studied when continuous phase modulation is used. An error performance calculation method is presented in case of modulation index error.
7730569/290478 Sequential algorithm application for solving navigation signal accelerated search problem
# 01, January 2012 This article considers a satellite navigation signal sequential search algorithm with complex statistics, which is optimal for average search duration minimum criterion in condition of weak signal receipt. Matched filtering in frequency domain, based on Fast Fourier Transform (FFT) is used in order to increase speed of signal acquisition. Signal detection block characteristics are researched in MATLAB. In addition, the considered algorithm and decision algorithm based on NeimanPirson criteria are compared.
7730569/291354 Code sequences for communication system based on UWBCDMA technology
# 01, January 2012 The authors consider a method of creating ensembles of code sequences obtained on the basis of Legendre sequences, for use in communication systems with ultra wideband signals (UWB).
7730569/293597 Algorithm of interference space compensation for sidelooking airborne radar with phased array
# 01, January 2012 The aim of this work was the development of adaptive algorithm for antenna array (AA) for sidelooking airborne radar; the characteristics of this algorithm were independent of reflection from underlying surface, including that from the main lobe of antenna directivity diagram. Proposed algorithm provided an operation of interference canceler of point sources with intensive reflection from local objects in “review” mode, that is the case of restricted time of radiolocating contact between sidelooking airborne radar and target. The following investigation methods were used: mathematical synthesis, mathematical simulation. Application domain was the following: adaptive antenna arrays in sidelooking airborne radars.
7730569/255100 The development of algoritm for decisionmaking process quality estimation when using heterogeneous information sources simultaneously.
# 01, January 2012 The new method of estimation of the decisionmaking process based on usage of heterogeneous information sources is proposed in this article. The results of mathematical simulation of this method are analyzed.
7730569/253104 The development of clarifying targeting algorithm in radar systems with millimeter waves, used for detecting low earth orbit satellites.
# 02, February 2012 This article deals with the synthesis of clarifying targeting algorithms in radar systems with millimeter waves and beam antennas, used for detecting low earth orbit satellites. The synthesis of the clarifying algorithm is carried out using the prior information about target trajectory, and also considers the constrained beam movement trajectory of real systems.
7730569/254905 Development of software for effecency simulation of technical solutions, used in radars.
# 03, March 2012 The article describes development of multipurpose software package for computer simulation which allows to objectively evaluate the effectiveness of any technical solution used in radars. The authors consider a structural scheme of the developed software and its components and describe the results of a simple simulation.
7730569/253065 Experimental research of different target types radar pictures in milieter wave range.
# 01, January 2012 In this article the results of experimental research works of composing data bank of radar pictures for different target types in millimeter wave range. The comparative analysis of produced radar pictures depending on angle of the object and wavelength range is included. To solve the detecting and recognizing problems, the possibility of using the oscillating components from Doppler’s images of targets was considered.
7730569/248250 Monopulse irradiator for receiving and trasmitting system with fourchannel receiver.
# 01, January 2012 In this article the development of monopulse millimeter wave irradiator is described. This irradiator works with circular polarization of electromagnetic waves and was proposed to be used in receiving and transmitting system with digital fourchannel receiver. The main advantages of the developed construction were analyzed; the plan of construction is included.



