ground-based navigation aid [航] 地面导航设备
ground based aircraft navigation aids 飞机地面导航设备
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Radar tracking of the shuttle, like the final accurate ground-based navigation, had not yet begun.
对航天飞机的雷达追踪，如最后精确的陆基导航，还没有开始。
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Each probe can pick up GPS signals and signals from eLoran, an enhanced version of Loran, the ground-based terrestrial radio-navigation system first used by the American and British navies during the second world war.
ECONOMIST: GPS jamming
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