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标准名称：	Ｂ－２１１型功率行波管
英文名称：	Power travelling wave tubes,Type B-211
中标分类：	综合 >> 标准化管理与一般规定 >> 技术管理
发布日期：	1982-01-11
实施日期：	1982-07-01
首发日期：	1900-01-01
作废日期：	2010-01-20
出版日期：	1900-01-01
页数：	16页

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MIL-PRF-89049/9A, PERFORMANCE SPECIFICATION SHEET: VECTOR VERTICAL OBSTRUCTION DATA (VVOD) (15 DEC 2005)., This specification sheet defines the content and format for the U.S. National Geospatial-Intelligence Agency (NGA) Vector Vertical Obstruction Data (VVOD) product. References to the VVOD specifications in this document assume use of both the general specification (MIL-PRF-89049A, dated 15 December 2005) and this specification sheet. The VVOD is a vector-based digital product that portrays vertical obstruction data. The VVOD also functions as a mission specific data set designed to support Geographic Information System (GIS) applications. The VVOD database contains data concerning known vertical obstructions worldwide. The vertical obstruction data stored in the database includes all of the manmade and natural vertical obstructions known by NGA projecting above the Earth?s surface which are sufficiently tall so as to pose a hazard to powered flight, both manned and unmanned. The specification provides a description of the content, accuracy, data format, and design of the VVOD database.