"' FuG 224 " Berlin A " "'was a German airborne radar of World War II . It used rotating antennae and a PPI ( Plan Position Indicator ) display to allow its use for ground mapping.
32.
Echos or " returns " are received by the hydrophone, routed through the sonar cable, processed in the aircraft and displayed on a cathode ray tube ( CRT ) in a plan position indicator ( PPI ) format.
33.
The master plan positions the airport in Lake Erie Watershed, north of Walnut Creek Sub-watershed, west of Cascade Creek Sub-watershed, and five miles ( 8 km ) west of Mill Creek Sub-watershed, which is part of the Presque Isle Bay Watershed.
34.
It was clear even at this point that a Plan Position Indicator ( PPI ) display would be desirable, but this would require a complex scanning parabolic antenna, compared to the very simple set of fixed antennas used in the A-scope system.
35.
The solution to night intercepts would be provided by Dr . W . B . " Ben " Lewis, who proposed a new, more accurate ground control display, the Plan Position Indicator ( PPI ), a new Ground-Controlled Interception ( GCI ) radar, and reliable AI radar.
36.
In 1957 after a short spell as Deputy Director of the Department of Tropical Architecture of the Architectural Association under Otto K�nigsberger, during which time he did some work assisting William Holford, Roger Johnson was appointed to a Colombo Plan position to establish a School of Architecture in Rangoon.
37.
In a typical plan position indicator ( PPI ) radar with a rotating antenna, this will usually be seen as a " sun " or " sunburst " in the centre of the display as the receiver responds to echoes from dust particles and misguided RF in the waveguide.
38.
"' Jagdschloss "', officially the "'FuG 404 "', was the designation of a early warning and battle control radar developed just prior to the start of World War II . Although it was built in limited numbers, Jadgschloss is historically important as the first radar system to feature a plan position indicator display, or " PPI ".
39.
Usually they operate pointing to the zenith, but an increasing number of them have nowadays scanning units, that allow to retrieve additional information such as volume information when performing various Range Height Indicator ( RHI ) scans at different angles and at a relatively high speed, and vertical wind profiles, when performing Plan Position Indicator ( PPI ) at few degrees from the zenith.
