摘要: A requirement for the National Airspace (NAS) is to provide for navigation, as identified in the NAS System Requirement Specification (NASSRS). This operational concept is one of many high level documents that will, in total, desc... 展开 A requirement for the National Airspace (NAS) is to provide for navigation, as identified in the NAS System Requirement Specification (NASSRS). This operational concept is one of many high level documents that will, in total, describe the operation of the NAS when the projected upgrade is complete. These documents will assist in linking the requirements specified in the NASSRS with the NAS design. This particular concept describes navigation as specified in paragraph 3.4 of the NASSRS, including paragraphs 3.4.1 Enroute Navigation; 3.4.2 Terminal Navigation; and 3.4.3 Visual Navigational Aids. The eight operational concepts are: Communication, Navigation, Monitoring, Maintenance and Support, System Effectiveness, Air Defense, Flight Planning and Traffic Control, and Airspace Management. 收起