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Radio propagation: Difference between revisions
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→Using Flightgear as a general purpose, 3D, radio signal propagation and terrain analysis tool
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A common point of these applications is the usage of the Irregular Terrain Model (also known as Longley-Rice)<ref>https://webcache.googleusercontent.com/search?q=cache:FqVjcDsXaPQJ:http://www.iucaf.org/sschool/darrel/propagat.ppt%2Blongley+rice+for+lower+frequencies&oe=utf-8&rls=org.mozilla%3Aen-US%3Aunofficial | A common point of these applications is the usage of the Irregular Terrain Model (also known as Longley-Rice)<ref>https://webcache.googleusercontent.com/search?q=cache:FqVjcDsXaPQJ:http://www.iucaf.org/sschool/darrel/propagat.ppt%2Blongley+rice+for+lower+frequencies&oe=utf-8&rls=org.mozilla%3Aen-US%3Aunofficial&hl=en&ct=clnk</ref> which is a propagation model developed by the U.S. Department of Commerce NTIA/ITS - Institute for Telecommunication Sciences and improved by several others (notably ITWOM <ref>http://bts.ieee.org/ieee-broadcast-technology-society-newsletter.html</ref> by Sidney E. Shumate, code available to the public on a limited usage license, copyright Givens-Bell <ref>http://www.its.bldrdoc.gov/isart/art08/slides08/shu_s-08.pdf</ref>). | ||
It is a general purpose model that can be applied to a large variety of engineering problems. The model, which is based on electromagnetic theory and on statistical analysis of both terrain features and radio measurements, predicts the median attenuation of a radio signal as a function of distance and the variability of the signal in time and in space.<ref>http://www.its.bldrdoc.gov/resources/radio-propagation-software/itm/itm.aspx</ref> <ref>http://web.archive.org/web/20110721032828/http://flattop.its.bldrdoc.gov/itm.html</ref> | It is a general purpose model that can be applied to a large variety of engineering problems. The model, which is based on electromagnetic theory and on statistical analysis of both terrain features and radio measurements, predicts the median attenuation of a radio signal as a function of distance and the variability of the signal in time and in space.<ref>http://www.its.bldrdoc.gov/resources/radio-propagation-software/itm/itm.aspx</ref> <ref>http://web.archive.org/web/20110721032828/http://flattop.its.bldrdoc.gov/itm.html</ref> | ||