Last Updated：2025/12/02
Sentence
その低空飛行のドローンは、レーダーの電波が地表から十分に上昇して低高度の目標を探知できなくなる距離の下に入り、管制官は接近に気付けなかった。
Quizzes for review
The low-flying drone slipped beneath the radar horizon, leaving air-traffic controllers blind to its approach.
See correct answer
The low-flying drone slipped beneath the radar horizon, leaving air-traffic controllers blind to its approach.
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Related words
radar horizon
Noun
Japanese Meaning
航空機検知システムにおける重要な性能指標の一つ。具体的には、レーダーの放射波が地球表面から十分に上昇して、低高度にある目標（航空機など）の検出が不可能となる距離を示す概念。
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