| 单词 | angel echo |
| 释义 | > as lemmasangel echo 15. An unexplained radar echo; also angel echo. Chiefly in plural. ΘΚΠ society > communication > telecommunication > radio communications > radio equipment > [noun] > radar apparatus > marks or signals on radar screen range mark1942 ghost1943 pip1944 range marker1944 blip1945 clutter1945 sea return1945 sea clutter1946 angel1947 1947 W. B. Gould in Proc. IRE 35 1105/1 Radar equipment..has given fairly consistent unexplainable echoes at altitudes between approximately 300 and 3000 yards. For want of a better term, these echoes have been dubbed ‘Angels’ by Signal Corps personnel. 1958 Proc. Royal Soc. B. 149 506 With the approach of a belt of rain, the angel echoes appear to die away in front of it. 2003 G. P. Kulemin Millimeter-wave Radar Targets & Clutter v. 251 The number of angel-echoes increases with increasing radar energy where angels with smaller RCS [= radar cross-section] will be observed. < as lemmas |
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