A Modern Trans-Ionospheric Propagation Sensing System,
GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
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One of the most important potential problems with modern military systems which utilize spacecraft in various ways is the effect of the ionosphere on the radio signals which pass to and from the spacecraft. Such systems include active communications and navigation satellites as well as both ground-based and potential space-based ranging systems. The major effects the ionosphere can have on such systems are the additional time delay the electrons in the earths ionosphere add to the free space path delay, the short term rate of change of this additional delay, amplitude scintillation or fading effects the signal encounters due to irregularities in the ionosphere, and Faraday rotation of linearly polarized radio waves transmitted through the ionosphere. The US Air Forces Air Weather Service is procuring a modern trans-ionospheric sensing system, called TISS, which will consist of a number of stations located throughout the world, making real time measurements of the time delay of the ionosphere, and its rate of change, as well as amplitude scintillation, along several different viewing directions from each station.
- Radio Communications
- Atmospheric Physics