| 单词 | sector scan |
| 释义 | > as lemmassector scan sector scan n. (frequently attributive with hyphen). ΚΠ 1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Sector scan, motion of the scanner reflector back and forth through a limited angle, instead of through 360°. 1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 387 Radar installations used for air-traffic control are sometimes required to operate on demand in sector-scan mode, the area of scan usually not exceeding 20° and the rate of scan approximately 20 scans per minute. 1978 Nature 9 Nov. 174/1 A simple sector scan mode is used, at a frequency of 1 Hz, with the target coupled acoustically to the transducer with water. < as lemmas |
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