Making a display system, the " Plan Position Indicator " ( PPI ), that displayed a 360 degree pattern proved surprisingly easy, and test systems were available by late 1940.
22.
Called " plan position indicators " ( " PPI " ), these simplified the amount of work needed to track a target on the operator's part.
23.
Instead of fixed aerials there was a rotary scanner, and thus the return signals gave a visual trace through 360 degrees on a CRT known as the Plan Position Indicator ( PPI ).
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A Plan Position Indicator ( PPI ) display was used to keep track of ships and enabled a multi-carrier force to maintain a high-speed formation at night or in foul weather.
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Other modes include Plan position indicator ( PPI ) display, RHI displays, etc . Up to 99 weapon locations can be stored and tracked at any time and can be transmitted to the command centre.
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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.
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Since the radar returns from ground closer to the aircraft would be received first, a display being drawn outward from the center, the classic Plan Position Indicator, would naturally decode the signal back into a 2D display.
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"' 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.
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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.
30.
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.
