- i. Atmospheric scatterers like water droplets in the form of clouds or rain, which cause clutter on the radar. These give the impression of targets with considerable depth, sometimes moving at quite high velocities. This is due to abnormal reflections, which return the radar beam to the ground and provide images of ground spots that appear to move at a velocity twice that of the atmosphere or wind velocity. Large numbers of angels are observed under conditions of abnormal propagation.ii. A term used in military air traffic control to indicate height in thousands of feet above mean sea level. Angels 5 means the aircraft is flying at 5000 ft. Angels “three two” means 32,000 ft. The height is given in angels if QNH (atmospheric pressure reduced to sea level pressure) is set on the altimeter and in flight levels when there is a standard altimeter setting.
Aviation dictionary. 2014.
Look at other dictionaries:
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