地空通信 meaning in English

ground-to-air communication

General specification for ground equipment of vhf air - ground communication . part 1 : technical specification for vhf equipment
甚高频地空通信地面设备通用规范.第1部分：甚高频设备技术要求
General specification for ground equipment of vhf air - ground communication . part 2 : maintenance specification for vhf equipment
甚高频地空通信地面设备通用规范.第2部分：甚高频设备维修规范
General specification for ground equipment of hf ssb air - ground communication . part 1 : technical specification for hf ssb equipment
短波地空通信地面设备通用规范.第1部分：短波单边带设备技术要求