| 单词 | primary radar |
| 释义 | > as lemmasprimary radar primary radar n. see sense A. 30. primary radar 30. Esp. in primary radar. Designating radar in which the transmitted signal is reflected by the target (in contrast to secondary radar, in which receipt of the transmitted signal by the target triggers the generation of a return signal). Cf. secondary adj. 3x. ΘΚΠ society > communication > telecommunication > radio communications > [adjective] > radar > types of sideways-looking1832 primary radar1945 shoran1946 passive1954 monopulse1955 back scatter1957 monostatic1957 side-looking1959 side scan1961 lookdown1968 1945 R. Watson-Watt in Nature 15 Sept. 323/2 Primary radar is that form of radar which ‘does not require the co-operation of the object to be located’. 1960 T. J. Morgan Radar xii. 137 The measurement of the wind direction and velocity was carried out by means of direction finding stations, then later by primary radar. 2004 9/11 Comm. Rep. (National Comm. Terrorist Attacks U.S.) i. 29 At 9:41, Cleveland Center lost United 93's transponder signal. The controller located it on primary radar, matched its position with visual sightings from other aircraft, and tracked the flight as it turned east, then south. < as lemmas |
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