Means of Improving the Quality of Service of the Computer Network of the Forensic Information System

Abstract

The relevance of research. In modern forensic practice, computer networks (CN) are an integral part of computer-technical examination, therefore, ensuring their normal functioning becomes a vitally important task. In this regard, the theory of the construction, modification and operation of digital telecommunication systems raises a fairly general problem of digital signal processing, network synchronization and its stability. A solution to this problem was devoted to research, which analyzed the characteristics of the stability of the network and proposed methods for measuring the physical parameters that determine it. Many of the studies conducted were based on the use of frequency measurements in communication channels of computer networks for transmitting information. Acousto-optic spectrum analyzers (AOSAs) are widely used in forensic information system networks improving the QoS of forensic computer networks. The subject of the research: resolution of acousto-optical spectrum analyzers. The purpose of the research to improve the quality of diagnostics of parameters of computer information transmission networks based on the use of the developed signal processing technique in acousto-optic spectrum analyzers, which allows increasing the resolution of AOSA by increasing the frequency resolution of two non-simultaneous long-duration radio pulses. The results of the research. The research presents analysis of the influence of the frequency parameters of the computer network on the implementation of the relevant requirements for quality of service. Studies have been carried out on possible ways to increase the resolution of AOAC in frequency. The nonlinear characteristics of AOSA were studied, which made it possible to modernize methods for increasing the frequency resolution. The classical method of processing radar signals is used, which allows determining the delay time of arrival of a sufficiently long pulse with an accuracy significantly exceeding the pulse size. When analyzing the operation of AOSA, it is taken into account that the signal photoelectron flux in the acousto-optical spectrum analyzer is known to be described by the Poisson distribution. But one of the main properties of random variables distributed according to Poisson's law is the lack of cross-correlation of the components of the Poisson stream. This assumption can significantly increase the frequency resolution of AOSA. Conclusions. The research ascertains analytical relationship for the dispersion of the signal frequency measurement. The research proposes a technique for processing signals in AOSA, allowing to increase the resolution of AOSA by increasing the frequency resolution of two non-simultaneous radio pulses of long duration.

A Method for Improving the Quality Indicators of a Distributed Forensic Information System

“…This is due to the specific capabilities of such methods: parallelism, high speed and frequency of optical signal processing, etc. [4,17,18].…”

“…2020. № 4 (14) ISSN 2524-2296 (online) practically in real time [4]. The advantages of using AOSA for solving spectral analysis problems and expanding the bandwidth of simultaneously analyzed frequencies necessitate a deeper analysis of the resolution of these devices.…”

“…The advantages of using AOSA for solving spectral analysis problems and expanding the bandwidth of simultaneously analyzed frequencies necessitate a deeper analysis of the resolution of these devices. Analysis of a number of works [4,7,14,17,18] devoted to the theory of development of devices for acousto-optic conversion and signal processing allows stating the contiguity of such characteristics of frequency accuracy as the accuracy of reading the radio signal frequency and resolution for the class of devices under consideration. In this case, the resolving power of an acousto-optic spectrum analyzer is understood to be its ability to resolve two close frequency components of the analyzed spectrum or two adjacent in frequency radio emission [7,14,17].…”

“…The distributed nature of forensic information systems and the importance of information processed by the system impose increased requirements both on the structure of the system itself and on the quality of data transfer between various subsystems. A large number of studies have been devoted to overcoming these problems [1][2][3][4][5][6][7][8][9][10][11][12].…”

Modeling Nonlinear Elements of Critical Computer Network

“…One of the main parameters affecting the quality of service is the stability and robustness of the frequency of a signal over which data is transmitted. In [1,21], methods and techniques for improvement of the accuracy of carrier frequency measurement in computer networks, reducing the jitter effect and increasing synchronization in communication channels, are analyzed. However, the studies were conducted without taking into account the nonlinear properties of either the signal source or the propagation medium.…”