Unverified50% confidenceFactExact time
978 MHz 的 UAT 主要在美国低空空域使用，服务于通用航空，FAA 允许在 18000 英尺以下且不进入 A 类空域的飞机选择 UAT 而非 1090ES 满足 ADS-B 装备要求
1
Sources
50%
Confidence
Long-term
Relevance
8/28/2026
First Seen
Sources
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