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Article 6_4_2020

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Dmitry S. Koptev, Federal State Budgetary Educational Institution of Higher Education «Southwest State University» (FSBEI of Higher Education «SWSU»), Kursk, Russia, d.s.koptev@mail.ru

According to the strategy for aircraft industry development up until 2023, the main efforts of the aviation industry are aimed at creating high-speed and maneuverable aircraft by means of increasing the power of propulsion units, implementing complex flight control systems, navigation, and improving the details of technical equipment [1]. However, the physiological capabilities of an aircraft operator (pilot) are beginning to lag behind the technological capabilities of state-of-the-art aircraft technology in terms of effective and operational management of it, carrying out military tasks and significant overload capacity. More than 70% of aviation accidents are related to the flight activity of crews, a third of which is caused by breakdown of the functional status of a pilot due to the impact of extreme flight factors. The system of medical operational monitoring (SMOM) is designed to register physiological indicators of the pilot’s health.
The goal of the present paper is to develop a variant of organizing a wireless network for transmitting data about the physiological status of a pilot on board aircraft in a high interference signaling environment. The research methods are based upon a sequential analysis of the mechanisms of wireless technologies operation for transmitting data over short distances (Bluetooth (IEEE 802.15.1), UWB (IEEE 802.15.4 z), IrDA), using various principles of information exchange (frequency range, signal-code structures, level of radiated power). Evaluating the possibility of using a particular technology was carried out in order to ensure correct operation directly during the flight on board aircraft affected by electromagnetic interference, noise, vibrations, and interference from devices operating in the adjacent frequency range. We used common methods of spectral analysis of signals, as well as the methods for evaluating the potential interference immunity of optical radiation reception.
Results. A variant of the wireless network for transmitting physiological indicators of the pilot’s health based on middle infrared band laser radiation has been developed in the given paper. The source of radiation used is a semiconductor laser based on the InGaAsP heterostructure with monochromatic emission at a wavelength of 1.55 micrometers, high- power output of optical radiation, and narrow (1-3 nm) spectral band width, which minimizes the influence of interference from natural and artificial light sources on the transmitted optical signal. The choice of emission wavelength is due to the lower amount of scattering and absorption, as well as safety for the operator’s eyes. The emission direction is maintained by equipping the laser with a thin spreading lens that increases the area of possible reception. The elimination of side emission is carried out using a multi — layer interference filter made of GaSb gallium antimonide films which has a high refractive index, high wear resistance, and narrow bandwidth (1.25-2.1 micrometers). The evaluation of interference immunity of wireless optical transmission line being carried out in the final part of the paper has shown that the use of such a filter does allow one to increase a signal-to-noise ratio at the input of photodiode.

Keywords: medical operational monitoring, physiological indicators of the pilot’s health, wireless data transmission, optical radiation, ultra-wideband signal, electromagnetic interference, interference immunity, semiconductor laser, signal spectrum.


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Information about authors:

Dmitry S. Koptev, post-graduate student, Federal State Budgetary Educational Institution of Higher Education «Southwest State University» (FSBEI of Higher Education «SWSU»), Kursk, Russia