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摘要
En 中文
In the years following World War II, as radars became larger and more sensitive, echoes were occasionally observed, which did not appear to correspond with targets or clutter. These became known as “angels.” Several people attempted to find explanations for these, and in some cases they were found to be due to weather phenomena, in other cases they were ascribed to birds.
Keyword:
Radar
L-band
Aerospace and electronic systems
Radar clutter
Echo interference
Acoustic measurements
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