7 / 20
Which of the following statements in reference to the display of aircraft on a primary ATC radar is correct?
  • A
    Both the range and bearing to the aircraft can be estimated but NOT simultaneously.
  • B
    Both the range and bearing to the aircraft can be estimated simultaneously.
  • C
    Only the bearing to the aircraft can be estimated.
  • D
    Only the range to the aircraft can be estimated.

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.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.