Home / Standards / GB/T 39414.4-2020 GB/T 39414.4-2020 Active Interface specification for signal in space of BeiDou navigation satellite system—Part 4: Open service signal B3I 北斗卫星导航系统空间信号接口规范 第4部分:公开服务信号B3I Standard Type GBT ICS 49.020 CCS V04 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 中央军委装备发展部 Drafting Unit N/A