单词 | ionosonde |
释义 | ionosonde [ī`än·ǝ´sänd] ENGINEERING A radar system for determining the vertical height at which the ionosphere reflects signals back to earth at various frequencies; a pulsed vertical beam is swept periodically through a frequency range from 0.5 to 20 megahertz, and the variation of echo return time with frequency is photographically recorded. |
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