单词	sector scan
释义	sector scan sector scan Scan in which the antenna oscillates through a selected angle. sector scan sector scan [′sek·tər ‚skan] (electronics) A radar scan through a limited angle, as distinguished from complete rotation. sector scan Sector scan.Sectional aeronautical charts.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. sector search 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. sector scan sec·tor scan in ultrasonography, a system in which the transducer or transmitted ultrasound beam is rotated through an angle, resulting in a wedge-shaped image. sec·tor scan (sek'tŏr skan) ultrasonography A system in which the transducer or transmitted ultrasound beam is rotated through an angle, resulting in a wedge shaped image.
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