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sector scan[′sek·tər ‚skan]
A radar scan through a limited angle, as distinguished from complete rotation.
A scan pattern in which the radar beam is made to rotate in the horizontal plane about the transmitter through a selected angle. This pattern is used in fire control, airborne interception, and the precision approach radars.
i. A method of searching for a ground target in a given sector. This method is used when the area of search is restricted. If the area is bigger, the creeping-line-ahead search method is used for the outer zone, whereas the sector search is used for the inner zone. The method involves flying along a radial and returning to base along a slightly different radial. The distance between the two radials, at the farthest place, is determined by the sweep width.
ii. Searching for an aerial target in a given sector. The radar aerial in this case looks and transmits within the given sector.