| 单词 | range gate |
| 释义 | > as lemmasrange gate range gate n. Electronics an electronic switch which restricts the signals accepted by radar to those returned after a time appropriate to the distance of the targets sought; a means of analogously restricting the range of signals accepted by an ultrasound device; (also) the restricted region represented by such signals. ΚΠ 1956 Electr. Communic. 33 11 To prevent interference by replies to other interrogating aircraft, the p.r.f. of each aircraft's transmission is jittered and the replies are strobed by a narrow range gate. 1984 European Jrnl. Obstetr. & Gynecol. 17 399 The range-gate facility of the pulsed Doppler instrument enables selection of a specific region..without interference of echos..from the placenta. 1990 Daily Tel. 29 Oct. 32/5 ‘Range gate stealing’..involves copying the characteristics of the enemy radar beam and sending out a signal resembling the natural echo. 2005 Measurem. Sci. & Technol. 16 1686/2 The sample volume, or range gate, in these measurements can be described as a region from which the scattered waves are received over the same time interval. < as lemmas |
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