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In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]
Easy approximations for calculating the path loss over distances significantly shorter than the distance to the radio horizon: In free space the path loss increases with 20 dB per decade (one decade is when the distance between the transmitter and the receiver increases ten times) or 6 dB per octave (one octave is when the distance between the ...
The European Union defines any passenger flight between city pairs separated by a great circle distance between 1,500 and 3,500 km (800 and 1,900 nmi) to be medium-haul, below as short-haul, and above as long-haul routes. [17]
HYSPLIT is also capable of calculating air pollutant dispersion, chemical transformation, and deposition. [2] The HYSPLIT model was developed by the National Oceanic and Atmospheric Administration (NOAA) Air Resources Laboratory and the Australian Bureau of Meteorology Research Centere in 1998. [ 3 ]
Fuel calculation must take many factors into account. Weather forecasts; The air temperature affects the efficiency/fuel consumption of aircraft engines. The wind may provide a head- or tailwind component, which in turn will increase or decrease the fuel consumption by increasing or decreasing the air distance to be flown.
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