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  "lead": ") s (curved lines) A plan position indicator (PPI) is a type of radar display that represents the radar antenna in the center of the display, with the distance from it and height above ground drawn as concentric circles. As the radar antenna rotates, a radial trace on the PPI sweeps in unison with it about the center point. It is the most common type of radar display.",
  "body": ")]] s (curved lines)]] A plan position indicator (PPI) is a type of radar display that represents the radar antenna in the center of the display, with the distance from it and height above ground drawn as concentric circles. As the radar antenna rotates, a radial trace on the PPI sweeps in unison with it about the center point. It is the most common type of radar display. ==Bibliography== Sir Bernard Lovell ECHOES OF WAR : The Story of H2S Radar Adapted from . There is an open source verification for this text on the home page . A. P. Rowe: One Story of Radar - Camb Univ Press - 1948 Dudley Saward, Bernard Lovell: A Biography - Robert Hale - 1984 Norman Longmate The Bombers: the RAF offensive against Germany, 1939-1945, Hutchins & Co, (1983), E. G. Bowen Radar Days David Atlas, Radar in Meteorology: Battan Memorial and 40th Anniversary Radar Meteorology Conference, published by American Meteorological Society, Boston, 1990, 806 pages, , AMS Code RADMET. Yves Blanchard, Le radar, 1904-2004: histoire d'un siècle d'innovations techniques et opérationnelles , published by Ellipses, Paris, France, 2004 Brown, Louis. A Radar History of World War II: Technical and Military Imperatives, Philadelphia, Pa.: Institute of Physics Publishing, 1999. R. J. Doviak et D. S. Zrnic, Doppler Radar and Weather Observations, Academic Press. Seconde Edition, San Diego Cal., 1993 p. 562. Roger M. Wakimoto and Ramesh Srivastava, Radar and Atmospheric Science: A Collection of Essays in Honor of David Atlas, publié par l'American Meteorological Society, Boston, August 2003. Series: Meteorological Monograph, Volume 30, number 52, 270 pages, ; AMS Code MM52. ==References==",
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