接力

Each runner passes the baton to the next.

每个赛跑选手都把接力棒传给下一个人。

An L-band safety remote control system is introduced which is composed of three stations and one center in order to increase coverage and overcome the limit of earth curvature to intervisibility.

本文介绍一种L频段安控系统,它由“三站一中心”组成,用三站无线接力法来高围并解决地球曲率对通视限制。