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单词 angel echo
释义

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angel echo
15. An unexplained radar echo; also angel echo. Chiefly in plural.
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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.
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