Effects of fire and fire extinguishing on wireless communications in the 2.4 GHz ISM band
Lebaric, Jovan E.
Adler, Richard William
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The objective of this research was to quantify the effects of fuel fire and the follow-on fire extinguishing actions on wireless shipboard communications in the 2.4 GHz ISM band. The attenuation of 2.4 - 2.485 GHz signals transmitted through diesel and heptane fire, water mist created by the fire extinguishing system, and subsequently developed steam, using directional and non-directional antennas with horizontal and vertical polarization, was measured onboard ex-USS SHADWELL using a PC-controlled scalar network analyzer. Statistical analysis of the measured data was performed using a code developed in MATLAB. Whereas, the attenuation for directional antennas exhibits relatively small variations with time and frequency, for nondirectional antennas fire and the follow-on fire-extinguishing phases create severe non-stationary frequency selective fading. Therefore standard communication techniques effective against frequency selective fading (non-stationary but slowly varying with time) are recommended for use with communication systems intended for shipboard indoors use. Even in normal conditions, without fire or water mist/steam, we have determined that frequency selective fading would be a problem for non-directional antennas used in shipboard compartments and thus a system with anti-fading capability should be considered for shipboard indoors use.
NPS Report NumberNPS-EC-00-007
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