127

The problems related to advancements in signal processing, mathematical tools and new analysis methods applied in investigations into different industrial fields have been intensively explored over the last few years.  In the Scientific Journal of Gdynia Maritime University, this issue is addressed to widely-treated problems occurring in a newly-defined discipline of science: automation, electronic, electrical engineering and space technology. The issue comprises six research papers, specifically dedicated to a subject as a mobile application using Augmented Reality (AR) (1), reconstructing damaged data in telecommunication systems (2), authenticated Wifi-based wireless data transmission from multiple sensors (3), improved performance of Wifi-based communication with multiple sensors (4), assessment of the accuracy of a virtual multi-channel temperature measuring instrument (5) and decision parameters used in project financing and their implications for offshore wind farm projects (6).

The first paper (1) presents and discusses the operation of mobile application using  Augmented Reality (AR) to visualise the electromagnetic (EM) radiation from a horn antenna. The EM radiation visualisation data were obtained through numerical simulation using the CST Studio Suite software.

The second paper (2) contains a review of machine learning based methods for reconstruction of damaged Automatic Identification System (AIS) data as well as inspirations from other telecommunication system for dealing with this kind of
a problem.

In the third paper (3), a novel technique to perform authenticated wireless Wifi data transmission from multiple sensors to the control station is discussed.
This control station is based on a laboratory stand for the purpose of analysing the principle of coexistence between wireless technologies dedicated to industrial automation, such as wireless HART, and general purpose technologies, such as Wifi and Bluetooth Low Energy (BLE).

The fourth paper (4) is a continuation of the research conducted in (3), in which the importance of coexistence between different wireless technologies in the instrumentation field is discussed. In order to increase the range of wireless communication, the Wifi based ESP-NOW protocol has been presented as an alternative to performing such a task from the perspective of possible future application in maritime engineering.

Papers (5) is dedicated to the problems of theoretical and empirical evaluation of accuracy obtained in a multi-channel temperature measurement system which works with NTC thermistors. Two different methods were used to theoretically estimate this accuracy: Gauss’s method and The Monte Carlo method. The empirical assessment of accuracy is supported by measurement data collected during the calibration procedures for the device developed and the results of verification measurement performed on the working device.

The last paper, (6), is addressed to solving a problem of wind farm project financing. Since a large part of offshore wind farms is financed by debt capital,
it was examined which criteria currently prevail on the market. The main finding is that cover ratios are the most important key figures for the decision-making process and during the term.

Janusz Mindykowski