INFORMATION TECHNOLOGIES AND SYSTEMS
TRAINING PROCEDURE IN DEVELOPMENT OF MODELS FOR COMPLEX SYSTEM
TECHNICAL STATE CONTROL
Valentin I. Senchenkov
3
Existing technologies of training in development of mathematical models of complex systems as objects under control are analyzed. A new training technology is proposed which implies a special grouping of images used in the training procedure and ranging of the groups to increase the procedure convergence rate. Some advantages and peculiarities of training procedures using orthonormal trigonometrical basis in models of control over correctness of complex system operation are considered
SYNTHESIS OF ITERATIVE ALGORITHMS OF SOLUTION OF BOUNDARY VALUE
PROBLEMS AND NONLINEAR EQUATIONS
Viacheslav I. Mironov, Yury V. Mironov, Rafael M. Yusupov
9
A method is proposed for synthesis of iterative algorithms of solution of nonlinear boundary value problems and equations. The method employs approximated solutions for several simplified model problems. Application of the method for the problem of pulsed control over a space vehicle flight is presented.
15
Possible approaches to realization of system securing aircraft approach and landing with the use of GLONASS technologies are considered. An improvement of accuracy of navigating support due to combination of differential station with additional ground emitter of GLONASS-type signal. Results of modeling of errors in navigation data for various stages of approach and landing are presented.
PROCESSING OF WIND COHERENT DOPPLER LIDAR DATA ON THE BASE OF GAUSSIAN
APPROXIMATION METHOD
Valery R. Akhmetianov, Olga A. Mishina
20
Gaussian approximation method for determination of parameters of Doppler spectrum from wind coherent Doppler lidar data is described. The formulas for implementation of the method are given. Basic characteristics of the proposed method are determined with the use of mathematical modeling. Comparison with known methods of wind velocity estimation is carried out.
COMPUTING TECHNIQUE
COMPUTING DEVICE FOR RADAR SIGNAL PROCESSING
Anatoly I. Grushin, Maxim L. Remizov, Artem V. Rostovtsev, Nikolaev Dmitry D., Chin Kuang Kien
27
Hardware realization is proposed for recursion algorithm of 6464 complex-valued matrix evaluation in real-time processing of radar data. Initial formula is analyzed and transformed, functional models are developed, accuracy of calculations is investigated. A method of data presentation is proposed to facilitate hardware design process. Special computing device realizing the algorithm is developed, prototype synthesis and debugging is performed.
HARNESSING OF SELF-ADJUSTED ENVIRONMENTS FOR PROACTIVE SECURITY OF
COMPUTER SYSTEMS
Oleg V. Kazarin, Vladimir Yu. Skiba
34
An approach is proposed to the problem of computer system proactive security. The approach is based on application of algorithmic instruments using methodology of self-testing and self-correcting programs. Along with development of self-corrected schemes, this approach is expected to become one of fundamental principle in proactive safe computer systems design.
ELECTRONIC AND ELECTROMAGNETIC DEVICES
ELECTRIC BRIDGE WITH EXPANDED FUNCTIONAL CAPABILITIES
Gennady I. Peredelskiy, Vladimir I. Ivanov
40
A four-armed pulse-powered bridge circuit is developed to measure parameters of various multi-element R-C, R-L and R-L-C two-terminal networks. Extended capabilities of the bridge are provided by replacing single resistor in compensating arm of the bridge with a multi-element two-terminal network, and does not call for additional
HIGH-SENSITIVITY DIGITAL GENERATING CONVERTER
Dmitry A. Nagaev, Victor K. Shakursky
45
An example of program module of digital generating converter is described. The problems of digital filters selection, choice of control method, stability of generated oscillations in high-sensitivity mode, information input / output, and the converter linearity range are considered. Results of computer modeling of the converter are presented.
DIGITAL NANOTESLOMETER
Anton A. Golubev, Vyacheslav K. Ignatiev
49
A digital Hall magnetometer with remaining voltage compensation is described. The magnetometer sensitivity limit is 3·10–9 Tl s . A four-pulse compensation algorithm is implemented to reduce the error in absolute magnet field measurement.
CODE-TO-VOLTAGE CONVERTER WITH WEIGHTED CURRENTS SUMMATION AT
LADDER-TYPE ATTENUATOR
Valentine G. Galalu
54
A generalized structure of code-to-voltage with weighted current summation at a ladder-type attenuator is described. The possibility of reduction of number of precision resistors in the converter is analyzed. Results of experimental study of 15—16-bit converters suitable for microelectronic devices are presented.
OPTICAL AND OPTO-ELECTRONIC INSTRUMENTS AND SYSTEMS
ВЛИЯНИЕ НАЧАЛЬНЫХ ФАЗ СВЕТОВЫХ ВОЛН
ПРИ ГЕНЕРАЦИИ ГАРМОНИК И ФОТОВОЛЬТАИЧЕСКОМ ЭФФЕКТЕ
Lev Andreev, Alexey V. Bakholdin, Пруненко Ю. К.
59
Requirements to optical systems of digital cinema are considered. The basic characteristics of projective and movie optics for digital cinema are defined.
65
Generation of optical harmonics in nonlinear optical crystal under the influence of broadband radiation is considered. Effect of phase difference of wave components mixed at the crystal is analyzed.
HEAT REGIMES AND RELIABILITY OF INSTRUMENTS AND SYSTEMS
THERMAL RESISTANCE OF PERMANENT JOINT OF STRUCTURAL COMPONENTS
Anton Sokolov, Nicolay N. Tarnovsky
70
Thermo physical and mathematical models are developed for joint of structural components. Thermal fields in elements are taken to be one-dimensional, coefficients of thermal conductivity of materials and heat transfer are supposed to be independent of temperature and coordinates; heat transfer through external surfaces of the elements is neglected. Exact expressions and approximate formulas in particular cases are derived for thermal resistance of the joint at coinciding and opposite directions of input and output thermal flows.
