一、概述国际民航组织对其提出的通信、导航、监视与空中交通管理系统概念（简称CNS／ATM系统）正以地区和国家两级的规划建设为基础，推动实施。在某些地区和某些子系统方面，实施工作已取得了一定进展。在技术与运行方面，标准和指导材料的制定工作正在按计划进行。但是，标 I. Overview ICAO’s concept of communications, navigation, surveillance and air traffic management systems (referred to as CNS / ATM systems) proposed by ICAO is being implemented based on the planning and construction at the regional and national levels. In some areas and some subsystems, some progress has been made towards implementation. In terms of technology and operation, the development of standards and guidance material is proceeding as planned. However, the standard