Refer to figure.
Primary Surveillance Radar (PSR)
The PSR output data uses polar coordinate system - it provides range and bearing of the targets found in respect of the antenna position, these are acquired simultaneously. Note that the range is the slant distance from the antenna and not the horizontal distance.
The range is determined by the time difference of the emitted and received pulse (the speed of propagation is the speed of light) and the bearing is obtained from the antenna azimuth. The rotation speed of the antenna is usually between 5 and 12 rpm.
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