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调频模拟移动通信平台检测项目报价? 解决方案? 检测周期? 样品要求? |
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本标准规定了移动通信调频接收机(以下简称接收机)性能的定义、测量条件和测量方法。本标准适用于工作频率为25 MHz~1 000 MHz,传输单路话音和其他类型信号,其音频带宽不超过10 kHz的移动通信调频接收机。
本标准规定了9kHz~300GHz频段内无线电发射设备的频率容限、杂散域发射功率限值要求和通用测量方法,同时确定了不同无线电发射类别必要带宽的计算公式。本标准适用于9kHz~300GHz频段内的不同功率等级、不同类别的无线电发射设备。但不适用检测营救器电台或水上发射机等安全业务和特别业务的杂散域发射指标。
本标准适用于铁路工程的规划、勘察、设计、施工及验收等。
本标准规定了公安移动通信网警用自动级(模拟集群)通信系统工程设计的技术要求。本标准适用于新建警用350 MHz集群通信工程。对于改建、扩建工程及其他频段的专用超短波通信工程亦可参照执行。
本标准规定了高速公路紧急电话系统(以下简称紧急电话)的分类、结构与标志、使用环境条件、性能指标、功能、试验方法、检验规则、包装与标志、运输及安装验收的要求。 本标准适用于高速公路(含一级汽车专用公路)紧急电话系统的设计、生产及使用。
本标准规定了移动通信所用的基本术语及其定义,包括移动通信业务、基本技术、移动通信系统及各类移动通信设备涉及的术语及定义等。 本标准适用于移动通信的科研、教学、设计、生产、使用和管理。
本标准规定了采用TDMA制的数字集群移动通倌系统的频段、网络结构、业务、空中接口、同步、安全性、编号、接口要求和设备的基本技术要求。 本标准适用于数字集群移动通信系统(包括专用网和共用网)的规划、工程设计、使用及设备的开发、生产。
本规范适用于新建、扩建和改建的陆上凝析气田地面工程、海上凝析气田陆上终端工程。
本规程适用于新建、改建、扩建的供比赛和训练用体育建筑的智能化系统工程的设计、施工和验收。
本标准规定了铁路数字移动通信系统(GSM-R)数字光纤直放站(以下简称GSM-R数字光纤直放站)的系统构成、系统功能、技术性能指标要求和检验方法。本标准适用于GSM-R数字光纤直放站的产品制造、质量检验和工程设计。
本部分规定了电网调度的词汇。本部分适用于从事电力行业的工作人员、高等院校师生在对外交流、定货、签定合同、设备验收和学术交流时,使用规范的中、英文名词术语。
The passive radio astronomy service (RAS) is studying natural phenomena producing radio emissions at frequencies fixed by the laws of nature. Primary allocations have been made to various space services in the Earth-to-space direction such as the fixed-satellite service (FSS), radionavigation-satellite service (RNSS), mobile-satellite service (MSS) and broadcasting-satellite service (BSS) in bands adjacent or nearby to bands allocated to the RAS.
This Recommendation describes methodologies and reference fixed system characteristics forimplementation of the System Specific Methodology (SSM) of Appendix 5 of the Radio Regulations (RR),which allows a detailed assessment of the need to coordinate frequency assignments for non-geostationary(non-GSO) space stations (space-to-Earth) and receiving systems in the fixed service (FS). TheRecommendation also describes a possible methodology for use in bilateral coordination of non-GSOmobile-satellite service (MSS) transmitting space stations with stations of the FS.
Demand in the land mobile service is on the increase due to annual growth as well as to new data-based service requirements. This has led to the development of more spectrally efficient technologies utilizing digital modulation and in many cases trunking. These technologies are being introduced in systems worldwide to accommodate this demand.
Recommendation ITU-R M.1645 describes in particular the expectations concerning the future development of IMT-2000 and IMT-Advanced: In the framework of technological advances and introduction of IMT-2000 mobile radiocommunications, agreement on uniform and co-ordinated strategies and approaches in the ITU has been and will continue to be a prerequisite for worldwide success.
ITU-R conducted sharing studies related to the candidate bands to determine the suitability of the candidate bands for IMT identification. This Report assesses the feasibility of sharing between IMT systems operating in the 450-470 MHz band and the radiocommunication services having a primary allocation in Section IV of Article 5 of the Radio Regulations – Table ofFrequency Allocations (henceforth referred to simply as the Table) in the 450-470 MHz band and in the adjacent 420-450 MHz and 470-480 MHz bands. This study addresses onemember of the IMT family, i.e. IMT-2000 CDMA Multi-Carrier (CDMA-MC).For ease of reference, CDMA-MC operating in the 450-470 MHz range is referred to as CDMA450 throughout the document. Further revisions of this Report may include other technologies in the IMT family.
This Report addresses the application and implications of SDR to land mobile systems, including, but not limited to, IMT-2000 and systems beyond, dispatch systems, intelligent transport systems (ITS), public mobile systems including public protection and disaster relief (PPDR), and first and second generation cellular systems including their enhancements. It addresses issues on the efficient use of spectrum using SDR techniques and adaptive control mechanisms, frequency sharing issues relating to SDR and general technical issues.
Single-ended method for objective speech quality assessment in narrow-band telephony applications SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Objective measuring apparatus Study Group 12
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