The second channel is a transponder with no guard . it can be used in the relay communication system and can be composed into a data platform with remote control if additional terminal equipment is added . its application in other systems is also discussed 而乙机信道是一个无人职守的转发器信道，除了直接可用于接力通信系统中外，如果增添适当终端设备还可构成具有遥控功能的数据报告平台，论文给出了本防撞雷达射频信道应用在其它系统中的实例。
