M18 通信设备容量系列 标准查询与下载

ITU-R SA.1629-2003 带有在257～262 MHz频段内的固定、移动和移动卫星业务的空间探测和空间运转业务中的命令链路间的共享

The ITU Radiocommunication Assembly, considering a) that in the range between 0.1 and 1 GHz, the space research service (SRS) and space operation service have a combined primary allocation of 3.9 MHz and a combined secondary allocation of 10.35 MHz in the space-to-Earth direction, but only a combined 2.4 MHz in the Earth-to-space direction(telecommand links),the latter allocation being subject to agreement under No. 9.21 of the Radio Regulations; b) that Recommendation ITU-R SA.363 contains recommendations on the necessary bandwidth and protection criteria for space operation systems in the frequency range from 0.1 GHz to 30 GHz; c) that Recommendations ITU-R SA.364 and ITU-R SA.609 contain recommendations on the necessary bandwidth and protection criteria for manned and unmanned near-Earth satellites in the SRS; d) that Recommendation ITU-R SA.514 contains interference criteria for command links in the Earth-to-space direction in bands below 1 GHz; e) that Recommendation ITU-R SA.1017 provides a method for calculating link performance in the SRS; f) that criteria are given in Recommendation ITU-R F.758 for sharing between the terrestrial fixed service and other services which may be used in bands below 1 GHz; g) that the method of determining the coordination area around an earth station operating with non-GSO satellites in frequency bands shared with terrestrial services is set out in Recommendations ITU-R SM.1448 and ITU-R M.1185.

Sharing between command links in the space research and space operation services with the fixed mobile and mobile-satellite services in the frequency band 257-262 MHz

ITU-R SA.1632-2003 地球探测卫星业务(有源)和移动业务中的无线接入系统(包括无线局域网)5 250-5 350 MHz频段的共享

suitable limits on the power flux-density, set up at the surface of the Earth, in a reference bandwidth

Sharing in the band 5 250-5 350 MHz between the Earth exploration-satellite service (active) and wireless access systems (including radio local area networks) in the mobile service Question ITU-R 218/7

ITU-R SM.1604 SPANISH-2003 用于发展中国家的更新频谱管理系统的指南

The Recommendation considering that the creation of an upgraded spectrum management system would contain software modifications to the current Windows multi-lingual basic automated spectrum management system (WinBASMS) to support and facilitate upgraded national spectrum management and monitoring, coordination among administrations and notification to the Radiocommunication Bureau (BR).

Guidelines for an upgraded spectrum management system for developing countries

ITU-R SM.1604 FRENCH-2003 用于发展中国家的更新频谱管理系统的指南

The Recommendation considering that the creation of an upgraded spectrum management system would contain software modifications to the current Windows multi-lingual basic automated spectrum management system (WinBASMS) to support and facilitate upgraded national spectrum management and monitoring, coordination among administrations and notification to the Radiocommunication Bureau (BR).

Guidelines for an upgraded spectrum management system for developing countries

ITU-R SM.1603-2003 作为国家频谱管理方法的频谱重新部署

The radio spectrum is a finite, but reusable resource that can benefit each administration by providing a medium to assist communications and economic development. In order to maximize the benefits to an administration the radio spectrum needs to be eff

Spectrum redeployment as a method of national spectrum management

DLA MIL-D-3954 C (3)-2002 电子波导仿真载荷的一般规范

This amendment forms a part of MIL-D-3954C, dated 19 November 1973, and is approved for use by all Departments and Agencies of the Department of Defense.

DUMMY LOADS, ELECTRICAL WAVEGUIDE, GENERAL SPECIFICATION FOR

ITU-R SF.1572-2002 评估在降雨为主要的衰减机制的频段内空对地从固定卫星业务到固定业务的干涉影响的方法

that emissions from space stations in the fixed-satellite service (FSS) operating in geostationary orbit (GSO) and sharing the same spectrum as the fixed service (FS) may produce interference in receiving stations of the FS

Methodology to evaluate the impact of space-to-Earth interference from the fixed-satellite service to the fixed service in frequency bands where precipitation is the predominant fade mechanism

ITU-R SF.1481-1-2002 47.2-47.5和47.9-48.2GHz频段内使用高海拔平台站的固定业务中的系统和固定业务中静止轨道卫星系统之间的频率共享

It is recognized that systems utilizing HAPS have a potential applicability to various services such as mobile and broadcasting services. In this Recommendation the application is focused on the FS in the bands 47.2-47.5 and 47.9-48.2 GHz.

Frequency sharing between systems in the fixed service using high-altitude platform stations and satellite systems in the geostationary orbit in the fixed-satellite service in the bands 47.2-47.5 and 47.9-48.2 GHz

ITU-R TF.767-2-2001 全球导航卫星系统高精确度的时间传递

that there is a growing worldwide need for inexpensive time transfers to accuracies less than 1 ps, which are fully automatic (in particular, capable of resuming synchronization after power losses without human intervention) and which possess adequate c

Use of Global Navigation Satellite Systems for High-Accuracy Time Transfer

DLA MIL-D-81976 (1)-2001 DA-662/UPQ-5型电子仿真载荷

This amendment forms a part of MIL-D-81976, dated 17 June 1974, and is approved for use by all Departments and Agencies of the Department of Defense.

DUMMY LOAD, ELECTRICAL DA-662/UPQ-5

YD/T 1082-2000 接入网设备过电压过电流防护及基本环境适应性技术条件

本标准规定了接入网设备的过电压过电流防护及基本环境适应性技术要求和试验方法。 本标准适用于接入网局端设备和远端设备(包括室内型设备和室外型设备)的过电压过电流防护性能及基本环境适应性检验。 本标准不涉及辐射电磁场的防护。

Technical requirements for the protection against overvoltages and overcurrents and the suitability in basic environment on access network equipment

ITU-R SA.1415-1999 频段25.25-27.5GHz内卫星间业务系统之间的共享

Sharing between Inter-Satellite Service Systems in the Frequency Band 25.25-27.5 GHz

Sharing between Inter-Satellite Service Systems in the Frequency Band 25.25-27.5 GHz

ITU-R SA.1347-1998 无线导航卫星业务接收机和地球探索卫星(有源)以及空间研究(有源)业务在1215-1260MHz频段的共享的可行性

The frequency band 35.5-36 GHz is allocated to the EESS (active), space research (active), radiolocation and meteorological aids services on a primary basis. Although the 35.5-36 GHz band is allocated for meteorological aids, there is no known use of th

Feasibility of Sharing between Radionavigation-Satellite Service Receivers and the Earth Exploration-Satellite (Active) and Space Research (Active) Services in the 1 215-1 260 MHz Band

ITU-R SM.1266 FRENCH-1997 适应性中频(MF)/高频(HF)系统

The ITU Radiocommunication Assembly considering that in recent years adaptive MFíiiF systems have been developed which automatically select the optimum channel from a predetermined group of channels.

ADAPTIVE MF/HF SYSTEMS

ITU-R SM.1266-1997 适应性中频/高频系统

The advent of new component technology, digital signal processing (DSP), and automation has led to the re-examination of system concepts which have been employed in MF and HF systems.

ADAPTIVE MF/HF SYSTEMS

ITU-R SM.1266 SPANISH-1997 适应性中频(MF)/高频(HF)系统

The ITU Radiocommunication Assembly considering that in recent years adaptive MFíiiF systems have been developed which automatically select the optimum channel from a predetermined group of channels.

ADAPTIVE MF/HF SYSTEMS

ITU-R SNG.SERIES-1995 1995SNGXI系列卫星新闻收集

A digital SNG terminal must be able to be rapidly deployed, to transmit (with a minimum of impairments) vision and associated sound or sound programme signals, to provide limited receiving capability to assist in the pointing of the antenna and to monitor

1995 SNG Series Fascicle Satellite News Gathering

ITU-R SM.1131-1995 世界范围内频谱分配的考虑因素

Several factors need to be considered when evaluating where worldwide allocations are needed. The factors described below should be understood in the context of the time available to achieve a worldwide allocation where differing regional allocations curr

Factors to Consider in Allocating Spectrum on a Worldwide Basis

ITU-R SM.1133-1995 广义定义业务的频谱利用

This Recommendation considers the technical requirements for the utilization of more broadly defined services. The relationship between radio services in terms of broader and narrower definitions is shown in Fig. 1. The objective of using broadly defined

Spectrum Utilization of Broadly Defined Services

ITU-R SM.1131 SPANISH-1995 在世界范围内分配频谱的考虑因素

The ITU Radiocommunication Assembly considering a) that the Radio Regulations (RR) specify three “radio Regions” (RR Nos. 392 to 399); b) that, between the three Regions, there are many differences in allocated services and allocated band limits; c) that worldwide allocations can: simplify the Table of Frequency Allocations; ease coordination requirements; promote equipment availability for international markets and reduce production costs, thus helping to meet the requirements of developing countries in particular; facilitate activities that depend on internationally operable equipment (i.e. flight traffic control); d) that the factors to consider when evaluating the need for a worldwide allocation versus separate regional allocations in a specific frequency range need to be delineated.

FACTORS TO CONSIDER IN ALLOCATING SPECTRUM ON A WORLDWIDE BASIS