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Baums A.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2011

The mini-max method is designed for the analysis and optimization of energy consumption in single-processor real-time systems and offers several advantages over alternative methods when used in single-task and multitask systems. There has been no research, however, dedicated to its use in real-time systems with several processing elements. This work deals with the use of the mini-max method in subsystems with two executive elements. Two methods for the organization of systems processing sequential task threads are proposed. The first method is a synchronous one with an allotted time period for each task, and the second method involves an asynchronous task stream. The analysis and comparison of these methods are performed, and their efficiency in solving the problem of energy consumption is shown. © Allerton Press, Inc., 2011.


Kruminsh K.,Institute of Electronics and Computer Engineering | Plotsinsh V.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2013

Based on the example of the conversion of noisy UWB radar signals, the speed of operation of comparator-type methods for equivalent time conversion of signals is compared. As a signal model, a sine monocycle is used. The obtained results are also compared with the efficiency of noise suppression in gated equivalent time converters. As a measure of the speed of operation of comparator-type converters, the minimal number of comparison operations of the signal and the threshold required for reaching the specified sensitivity and dynamic range is used. As a measure of the speed of operation, the number of averagings required for reaching the specified sensitivity is used for gated converters. © 2013 Allerton Press, Inc.


Baums A.,Institute of Electronics and Computer Engineering | Gordyushin A.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2013

The response time of an autonomous mobile robot is presented as an internal performance index that characterizes a robot regardless of a particular task. The response time is defined as the time between the occurrence of an event, its detection by a robot, its recognition, the decision making, and the response. For fully autonomous robots and robots that are controlled by and interact with a human, analytical expressions for estimating the response time are presented. An analysis of the robotreconfiguration time when overcoming obstacles is presented. The analytical expressions are supported by numerical examples. © 2013 Allerton Press, Inc.


Hermanis E.,Institute of Electronics and Computer Engineering | Greitans M.,Institute of Electronics and Computer Engineering | Aristov V.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2015

A possibility of determining active and reactive components of a two-terminal network using the Fourier transform is studied. The initial time dependencies of the current and voltage pulses are approximated by Gaussian wavelets and power series of different orders. Restrictions on the computation accuracy and time are determined. © 2015, Allerton Press, Inc.


Krumin'sh K.,Institute of Electronics and Computer Engineering | Peterson V.,Institute of Electronics and Computer Engineering | Plotsin'sh V.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2015

The influence of thermal hysteresis of a clocked comparator on the quality of operation of a comparator type equivalent time sampling converter has been studied. The influence of thermal hysteresis is characterized by the noise and distortion of the converter zero line. The studies are carried out based on physical experiments and computer simulation. For physical experiments clocked comparator, based on tunnel diodes, is used. The up-and-down method is used as a sampling conversion method. © 2015, Allerton Press, Inc.


Baums A.,Institute of Electronics and Computer Engineering | Gordyushins A.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2015

Evaluation of the motion of a reconfigurable mobile robot over areas with different types of terrain and different positions of obstacles of two types is based on the analysis of movement of a simplified, i.e., abstract, robot between the two extreme points of the investigated terrain. The main correlations of the analysis have been successfully used in evaluating an expanded model of the robot during its motion over the area with a variety of different investigated objects, as well as in building a map of this terrain. © 2015, Allerton Press, Inc.


Rybakov A.S.,Institute of Electronics and Computer Engineering | Vedin V.Y.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2015

The features of discrete signal processing during the timing of events with interpolation based on phase measurements of harmonic oscillations are considered. It is shown that the parametric identification of the interpolator using methods of spectral estimation and linear algorithms of estimation of coefficients of the regression model provides picosecond accuracy in the measurement of time instants and intervals. The accuracy potential of the interpolation method based on the phase measurement results is illustrated by the results of actual calibration measurements and computer simulations. © 2015, Allerton Press, Inc.


Lorencs A.A.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2010

Linear regression models for the response, which depends on several controlled variables, are considered. The method of constructing such a plan of observations that provides the nondegeneracy of the information matrix of the regression model is substantiated. © Allerton Press, Inc., 2010.


Rybakov A.S.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2012

The possibilities are studied for improving the accuracy of the interpolation method for measuring the event occurrence time based on the digital processing of signals associated with the events. The problem of estimating the time of the analog signal arrival is formulated and solved as a problem of finding a fixed point of some contraction mapping. The compression function is constructed on the basis of spectral coefficients of a trigonometric series that approximates the shape of the analog signal. The accuracy potential of the interpolation measurement technique is illustrated by the results of computer simulation. © Allerton Press, Inc., 2012.


Greitans M.,Institute of Electronics and Computer Engineering | Aristov V.,Institute of Electronics and Computer Engineering | Laimina T.,Institute of Electronics and Computer Engineering
Automatic Control and Computer Sciences | Year: 2012

An application of the Karhunen-Loeve transformation (principal component analysis) to the extraction of the signal corresponding to small breathing displacements of the human chest is illustrated by the example of the ultrabandwidth impulse reflected from a simple human target. The reduction in the dimensions of the original signals from 256 to 5 is shown by experiments to take place in the case of small displacements and the mean-square error not exceeding 10%. © 2012 Allerton Press, Inc.

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