The airborne OTH target indication radar for ship born helicopter not only provides relay guidance and longer range, but also improves the missile attack accuracy.

舰载直升机机载超视距目标指示雷达不仅能为舰载导弹进行中继制导，延长导弹射程，而且能够提高导弹攻击精度。

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Metal waveguides are used in such technologies as microwave ovens, radar systems, radio relay systems, and radio telescopes.

金属波导用在微波炉、雷达系统、无线电望远镜等技术。

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But like radar technology, ADS-B currently relies on ground stations to relay information, making it useless over remote areas.

BBC: The key to preventing lost planes

On Day 44 of the trek, both a radar device meant to measure the ice thickness and a satellite communications unit to relay the data are still not working - despite being brought back to the UK for repairs and then delivered to the team last week.

BBC: Arctic team gives up on ice radar