It would appear from the activation of the emergency position indicating radio beacon (EPIRB) that something has happened.

紧急无线电示位标(EPIRB)的激活显示他们似乎是遇到麻烦了。

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Abstract: Beacon nodes are playing an important role in wireless sensor network localization, which are used as the reference nodes to calculate the target position.

摘要：信标节点在无线传感器网络定位技术中起着重要的作用，它作为参考节点决定着被定位目标的位置。

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Then, the effects of radar beacon position, cluster geometry and satellite altitude on the geometry dilution of precision factor are analyzed.

进一步分析了雷达辐射源位置、星座几何形状和星座的卫星高度对几何精度衰减因子的影响。

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The alarm set off by the men is known as an EPIRB - an Emergency Position Indicating Radio Beacon.

BBC: NEWS | UK | England | Bristol/Somerset | Stricken rowers rescued by ship

The three fishermen's vessel didn't have an Emergency Position Indicating Radio Beacon, which transmits a distress signal anywhere in the world through a satellite system, the navy said.

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Meanwhile, the coastguard was not alerted to the Purbeck Isle's plight for seven hours as it was not fitted with an emergency position-indicating radio beacon or similar distress signalling device.

BBC: Purbeck Isle deaths report: Life raft failures blamed