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عمومی::
نشانگر (اندیکاتور) موقعیت نقشه
The area near the center of the scope on the plan position indicator (PPI) will be brighter because the angle of reflection is almost perpendicular.
The many reflecting surfaces in a city or town redirect the radar energy back toward the aircraft, resulting in a bright image on the PPI.
When a large number of tracks are close together, as in a marshalling yard, the radar potential is increased enough to produce a bright return on the PPI.
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