radar beacon

radar-beacon的词性：
n.（名词）

1. A fixed device that sends or receives, amplifies, alters, and returns a radar signal, permitting a distant receiver to determine its bearing and sometimes its range.
雷达航标：一种发射、接收、放大、改变并返回雷达讯号的固定装置，允许远处的接收者测定它的情况，有时还有范围