clutter reflectivity

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• Weather radar — in Norman, Oklahoma with rainshaft …   Wikipedia

• Radar — For other uses, see Radar (disambiguation). A long range radar antenna, known as ALTAIR, used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on Kwajalein Atoll …   Wikipedia

• Radar MASINT — is one of the subdisciplines of Measurement and Signature Intelligence (MASINT) and refers to intelligence gathering activities that bring together disparate elements that do not fit within the definitions of Signals Intelligence (SIGINT),… …   Wikipedia

• warning system — ▪ military technology Introduction       in military science, any method used to detect the situation or intention of an enemy so that warning can be given.       Because military tactics from time immemorial have stressed the value of surprise… …   Universalium

• NEXRAD — Radar at the WSR 88D Radar Operations Center NEXRAD or Nexrad (Next Generation Radar) is a network of 159 high resolution Doppler weather radars operated by the National Weather Service, an agency of the National Oceanic and Atmospheric… …   Wikipedia

• Bande brillante — En haut, CAPPI de 1,5 km d altitude montrent de forts échos radar, en jaune, parmi des échos plus faibles en vert. Dans la partie du bas, la coupe verticale à travers les données radar montre que ces intensités sont dues à la présence d une zone… …   Wikipédia en Français

• Bright band — Bande brillante En haut, CAPPI de 1,5 km d altitude montrent de forts échos radar, en jaune, parmi des échos plus faibles en vert. Dans la partie du bas, la coupe verticale à travers les données radar montre que ces intensités sont dues à la… …   Wikipédia en Français

• Radar météorologique — Un radar météorologique est un type de radar utilisé en météorologie pour repérer les précipitations, calculer leur déplacement et déterminer leur type (pluie, neige, grêle, etc.). La structure tridimensionnelle des données obtenues permet… …   Wikipédia en Français

• History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

• Types and uses of radar — Radar has many different types and applications: * Search radars scan a wide area with pulses of short radio waves. They usually scan the area two to four times a minute. The waves are usually less than a meter long. Ships and planes are metal,… …   Wikipedia

• David L. Fried — is a scientist, best known for his contributions to optics. Fried described what has come to be known as Fried s seeing diameter, or r0 (usually pronounced r naught). The seeing diameter is effectively a limiting aperture due to atmospheric… …   Wikipedia