scholarly journals Improving the precision of the selection of piecewise linear useful signal component under conditions of a priori uncertainty

2021 ◽  
Vol 1029 ◽  
pp. 012102
Author(s):  
I S Shrayfel ◽  
V I Marchuk ◽  
A B Mihailov ◽  
I M Malcev ◽  
A V Fisunov
Keyword(s):  
Piecewise Linear ◽  
A Priori ◽  
Signal Component ◽  
Useful Signal ◽  
A Priori Uncertainty ◽  
Selection Of

scholarly journals Special aspects of using a new non-stationary random processes analysis approach in the conditions of a priori uncertainty of the useful signal function

2019 ◽  
Vol 30 ◽  
pp. 03002
Author(s):  
Vladimir Marchuk
Keyword(s):  
Additive Noise ◽  
High Efficiency ◽  
A Priori ◽  
Statistical Characteristics ◽  
Signal Function ◽  
Useful Signal ◽  
Priori Information ◽  
The Time Domain ◽  
A Priori Uncertainty ◽  
Stationary Random Processes

The paper considers the use of a new method of signal processing in the time domain under conditions of a limited amount of a priori information about the useful signal function and the statistical characteristics of additive noise. Research have shown its high efficiency in processing signals both local and global, using it to detect anomalous measurements, eliminating the systematic component in the case of a onesided law of the distribution of additive noise and a number of others.

Parameter Calibration in Dynamic Simulations of Power Cables in Shallow Water to Improve Fatigue Damage Estimation

2017 ◽  
Author(s):  
Charles Spraul ◽  
Vincent Arnal ◽  
Patrice Cartraud ◽  
Christian Berhault
Keyword(s):  
Fatigue Damage ◽  
A Priori ◽  
Power Cable ◽  
Power Cables ◽  
Dynamic Simulations ◽  
State Of Stress ◽  
A Priori Uncertainty ◽  
Selection Of ◽  
Improve Fatigue

The purpose of this work is to use in situ measurements during service to adjust the estimation of the cumulated damage, and achieve an increased accuracy in predicting the remaining life span of the power cable. Direct monitoring of fatigue damage is not feasible, nor is it possible to completely measure the power cable response along all its length. Measurements can though be obtained concerning environmental conditions and the floater motion, as well as the cable response in a few points. However numerical simulations are still required to compute the state of stress of the cable. Therefore the intended monitoring methodology aims at calibrating several parameters from the numerical model with respect to available measurements, in order to reduce the uncertainty on these parameters, and thus the uncertainty on the model output. Selection of these parameters must therefore be based on their influence on damage and on their a priori uncertainty. In this respect marine growth influence on cable characteristics is of particular interest.

RESEARCH OF THE ADAPTIVE FINITE-TIME SIGNAL FILTERING METHOD AND COMPARISON WITH THE ADAPTIVE KALMAN FILTERING

2021 ◽  
Vol 2 (28) ◽  
pp. 9-14
Author(s):  
I. V. Svetlov ◽  
◽  
Yu. P. Ivanov ◽  
Keyword(s):  
Key Words ◽  
Kalman Filtering ◽  
Correlation Functions ◽  
Finite Time ◽  
High Stability ◽  
A Priori ◽  
Time Signal ◽  
Filtering Method ◽  
Useful Signal ◽  
A Priori Uncertainty

The method of optimal characteristics, high stability and simplicity of the algorithm is presented. The method under consideration is compared with Kalman filtering. Cases of a priori uncertainty with unknown correlation functions of the noise and the useful signal are considered. Key words: finite-time filtering, Kalman filtering, a priori uncertainty.

scholarly journals Increasing the accuracy of signal extraction by correcting the approximating function under conditions of a priori uncertainty

2021 ◽  
Vol 279 ◽  
pp. 02003
Author(s):  
Ivan Nikishin ◽  
Vladimir Marchuk ◽  
Igor Shrayfel ◽  
Ilya Sadrtdinov
Keyword(s):  
Additive Noise ◽  
A Priori ◽  
Signal Extraction ◽  
Statistical Characteristics ◽  
Practical Implementation ◽  
Sample Length ◽  
Complex Signals ◽  
Useful Signal ◽  
A Priori Uncertainty ◽  
Measured Process

The paper discusses the issues of practical implementation of increasing the accuracy of signal extraction, which is achieved by eliminating the «flip» of the approximating function when dividing the measured process into intervals under conditions of a priori uncertainty about the signal function, which significantly increases the error of allocating a useful signal. The probability of a «flip» of the approximating function depends significantly on the variance of the additive noise and the sample length. The use of the proposed methods and their software implementation makes it possible to increase the accuracy of the useful signal extraction up to 30 percent in the absence of a priori information about the function of the measured process for complex signals and at least 20% for simpler ones. The use of the proposed methods will significantly increase the processing efficiency in the conditions of a priori uncertainty about the function of the measured process (useful signal) and the statistical characteristics of the additive noise components.

Method for measuring distortions of a speech signal during its transmission over a communication channel to a biometric identification system

2020 ◽  
pp. 65-72
Author(s):  
V. V. Savchenko ◽  
A. V. Savchenko
Keyword(s):  
Speech Signal ◽  
Communication Channel ◽  
Speaker Identification ◽  
A Priori ◽  
Small Samples ◽  
Practical Implementation ◽  
Identification System ◽  
New Information ◽  
Discrimination Criterion ◽  
A Priori Uncertainty

This paper is devoted to the presence of distortions in a speech signal transmitted over a communication channel to a biometric system during voice-based remote identification. We propose to preliminary correct the frequency spectrum of the received signal based on the pre-distortion principle. Taking into account a priori uncertainty, a new information indicator of speech signal distortions and a method for measuring it in conditions of small samples of observations are proposed. An example of fast practical implementation of the method based on a parametric spectral analysis algorithm is considered. Experimental results of our approach are provided for three different versions of communication channel. It is shown that the usage of the proposed method makes it possible to transform the initially distorted speech signal into compliance on the registered voice template by using acceptable information discrimination criterion. It is demonstrated that our approach may be used in existing biometric systems and technologies of speaker identification.

Innovative Approach to Information Search by Example of a Patent Analysis of an Important Substitution Plan

2020 ◽  
pp. 143-157
Author(s):  
Maria A. Milkova
Keyword(s):  
Information Search ◽  
Topic Modeling ◽  
Cognitive Biases ◽  
A Priori ◽  
Import Substitution ◽  
Innovative Approach ◽  
Iterative Search ◽  
Comprehensive Picture ◽  
Priori Information ◽  
Selection Of

Nowadays the process of information accumulation is so rapid that the concept of the usual iterative search requires revision. Being in the world of oversaturated information in order to comprehensively cover and analyze the problem under study, it is necessary to make high demands on the search methods. An innovative approach to search should flexibly take into account the large amount of already accumulated knowledge and a priori requirements for results. The results, in turn, should immediately provide a roadmap of the direction being studied with the possibility of as much detail as possible. The approach to search based on topic modeling, the so-called topic search, allows you to take into account all these requirements and thereby streamline the nature of working with information, increase the efficiency of knowledge production, avoid cognitive biases in the perception of information, which is important both on micro and macro level. In order to demonstrate an example of applying topic search, the article considers the task of analyzing an import substitution program based on patent data. The program includes plans for 22 industries and contains more than 1,500 products and technologies for the proposed import substitution. The use of patent search based on topic modeling allows to search immediately by the blocks of a priori information – terms of industrial plans for import substitution and at the output get a selection of relevant documents for each of the industries. This approach allows not only to provide a comprehensive picture of the effectiveness of the program as a whole, but also to visually obtain more detailed information about which groups of products and technologies have been patented.

Detection of Changes in the Random Signal Properties by Spectral Methods Under the Conditions of A Priori Uncertainty

1999 ◽  
Vol 53 (9-10) ◽  
pp. 1-10
Author(s):  
V. A. Omel'chenko ◽  
V. V. Balabanov ◽  
B. M. Bezruk ◽  
Yu. N. Goloborod'ko
Keyword(s):  
Spectral Methods ◽  
A Priori ◽  
Random Signal ◽  
A Priori Uncertainty

TAKING INTO CONSIDERATION OF THE MULTIPLE MODE OF THE FUNCTIONING AND CHARACTERISTICS OF THE CONTROL IN RELIABILITY MODELS OF REPLACEMENT TIME SYSTEMS

2019 ◽  
Author(s):  
Iryna Kononova
Keyword(s):  
A Priori ◽  
Telecommunication System ◽  
Structural Element ◽  
Reliability Models ◽  
Quick Recovery ◽  
Reliability Indicators ◽  
A Priori Uncertainty ◽  
Control Of Parameters ◽  
Time Systems ◽  
Time Reserve

The article evaluates the reliability indicators of telecommunication system equipment, which can be represented by multi-mode objects of continuous and episodic use with a time reserve operating under conditions of a priori uncertainty. Particular attention is paid to consideration of the process of functioning of the system with a replenished time reserve. The telecommunication system includes an object represented by one structural element and used in different modes of operation. In each mode, the object can be used continuously or episodically (the object performs tasks that occur at random times), herewith only a certain part of its equipment is operating. The restoration of the facility's operation in each mode is based on the "quick" recovery scheme ("quick" recovery means that the repair time is much less than the average working time of the element between failures). Also, some cases of the transition of an object from one mode to another are considered, and the control system operates according to the method of sequential control of parameters. In this case, the system, after waiting mode, begins to analyze the first parameter of the monitored complex, then the second and so on. After analyzing the parameters, the system enters the waiting mode. These calculated ratios allow for a comprehensive assessment of the reliability of telecommunication equipment, taking into account the totality of the main factors that significantly affect the reliability of the equipment in real conditions of operation, make it possible to solve important practical problems which arise from the improvement of existing equipment and development of existing equipment.

Spatial filtering of signals with spectrum overlapping

2019 ◽  
pp. 27-33
Author(s):  
M. E. Shevchenko ◽  
A. V. Gorovoy ◽  
S. N. Solovyov
Keyword(s):  
Antenna Arrays ◽  
A Priori ◽  
Spatial Filtering ◽  
Spatial Filter ◽  
Radio Sources ◽  
Probability Of Error ◽  
Shift Keying ◽  
A Priori Uncertainty

The paper considers the spatial filtering methods of signals with spectrum overlapping under conditions of a priori uncertainty of the directions of arrival from radio sources. The estimates of the directions of signals arrival obtained by ESPRIT or MUSIC are used in order to build a spatial filter. It is shown that when using ESPRIT, unlike MUSIC, an additional calculations of filter coefficients based on estimates of the directions of signals arrival are not required, and the quadrature components of the signals are formed simultaneously with estimates of the direction of their arrival. The probability of error performances of minimum shift keying signals which were divided by spatial filtering on the basis of ESPRIT and MUSIC using seven-element circular and angular antenna arrays are given.

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