共查询到20条相似文献,搜索用时 78 毫秒
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2001年,我国正式提出采用直播卫星技术手段彻底解决广播电视覆盖问题。经过多年的准备,2008年6月,我国成功发射了第一颗直播卫星,并开始卫星直播业务。截至2014年6月底,我国直播卫星村村通、户户通用户总数超过3400万户,成为全球最大卫星直播系统。本文介绍了我国卫星直播事业的现状、存在的问题与发展趋势,提出了加快发展直播卫星户户通工作需要解决的几个问题与方法。 相似文献
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本介绍了数字电视直播卫星的发展过程,阐述了我国实施卫星电视直播方案应考虑的几方面问题,以及目前可以用于数字电视直播卫星鑫诺1号卫星的总体性能和将来可以用于数字电视直播卫星的鑫诺2号卫星及中星8号卫星的总体性能。 相似文献
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宋红 《卫星电视与宽带多媒体》2020,(6):1-2
随着我国社会经济的发展和科学技术水平的提升,对广播电视行业带来了极大的冲击和影响,特别是卫星直播技术在广播电视领域的应用,不仅显著提升了广播电视在传媒行业的影响力,对广播电视行业的发展也起到了积极的推动作用。本文简单分析了我国广播电视卫星直播的发展现状和主要形式,并对卫星直播技术的优势和不足以及广播电视卫星直播技术的应用进行了简单阐述。 相似文献
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本文回顾了我国发展直播卫星业务的漫长历程,介绍了我国第一颗直播卫星的性能、主要参数和特点,以及第一期直播卫星村村通工程将有效解决中国广大偏僻乡村听广播看电视难的问题,最后提出了充分发挥"中星9号"卫星作用的建议. 相似文献
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Dulac S.P. Godwin J.P. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2006,94(1):158-172
An overview of satellite direct-to-home (DTH) digital television in the Americas is presented, including history, service applications, and a reference architecture identifying key system building blocks. Satellite DTH's relationship to and differences from terrestrial ATSC are highlighted. The paper concludes with notes on the technology evolutions that allowed the introduction of digital DTH satellite service and contribute to its continued growth today. 相似文献
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The general concepts of the system for digital television transmission by satellite developed within the European DVB (digital video broadcasting) project and standardised by ETSI (European Telecommunications Standards Institute) are described. The system, named DVB-S, is intended to provide DTH (direct-to-home) multi-programme TV services in the BSS (broadcasting satellite service) and FSS (fixed satellite service) bands and is addressed to consumer IRDs (integrated receiver decoders), as well as collective antenna systems (SMATV, satellite master antenna TV) and cable television head-end stations, with a likelihood of remodulation. The exploitation of the multiplex flexibility allows the use of the transmission capacity for a variety of TV service configurations. The use of flexible and advanced error protection techniques, based on the concatenation of Reed-Solomon and convolutional codes (with Viterbi decoding), allows optimum adaptation to different satellite transponder characteristics, i.e. bandwidth and power, providing high service quality and availability with small receiving antennas. For example, in climatic zone E (in Europe) on a 33 MHz transponder a data-rate of 38.1 Mbit/s can be transmitted, adequate to provide five standard definition TV programmes (SDTV) or, alternatively three to four enhanced definition programmes (EDTV), while ensuring 99.90% service availability (in the average year) with 50-cm receiving antenna within the 51 dBW EIRP (equivalent isotropic radiated power) service area contour 相似文献
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数字卫星电视接收天线仰角方位角极化角调试探讨 总被引:3,自引:0,他引:3
数字电视正以迅猛之势发展,目前数字电视信号主要是通过卫星传输,数字卫星电视信号的接收方法与模拟卫星电视信号的接收方法相同,利用室外抛物面状天线将数字卫星电视信号——电磁波接收下来,但由于数字电视信号的特点,接收数字电视卫星信号时的“寻星”过程远比接收模拟卫星电视信号困难得多,为此对数字卫星电视接收天线仰角、方位角、极化角的调试进行探讨。 相似文献
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授权电信运营商使用的5G频段距离广播电视C波段卫星接收下行频率较近,其中3300~3600MHz和我国C波段卫星广播电视业务存在干扰。5G基站的快速部署,不可避免地影响广播电视卫星信号的正常接收,严重威胁到了广播电视安全播出。本文主要针对卫星地球站抗5G干扰研究和工程实践。 相似文献
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作为广播电视信号三大传输手段之一的卫星传输技术,在当前仍然扮演着重要角色。卫星传输系统是一个开放系统,易受到外界信号的干扰。过境卫星干扰由于其具有隐蔽性、特殊性,给广播电视卫星传输带来许多不利影响。本文结合工作实际,通过介绍近年来发生的干扰实例,对过境卫星干扰的机理进行分析,提出减小干扰的有效措施,为同行提供一定的借鉴作用。 相似文献
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当前卫星电视接收技术的发展进入了一个新的时期,需要生产一些低档的普及站以满足不同用户的要求,而原来的“图标”没有包含这类普及站的技术条件。因此本文的目的旨在试图论证普及型卫星电视接收站应达到的五项视频指标。 相似文献
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A review is presented of the current television broadcasting situation in European countries, which involves a varied mix of terrestrial VHF or UHF systems and cable networks. A small market has emerged in Europe for receivers using the low-power telecommunications satellite transmission between the program providers and cable network companies. This is expected to change with the launch of medium-power pan-European telecommunication satellites (e.g. ASTRA, EUTELSAT II), which are now directly addressing the market of home reception. DBS (direct broadcast satellite) in the UK, using the D-MAC transmission standard, will offer three additional television channels, data broadcasting services, and a planned evolution to compatible forms of wide-screen, high-definition television. Comments are given on receiver and conditional access system standardization. Some views are expressed on satellite broadcasting as part of an overall broadcasting framework for the future 相似文献
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提出一种不中断电视信号、不携带贵重测量仪器到室外天线现场调整卫星电视接收天线的有效方法,该方法只需带1台小型电视机,具体操作有两种方案:一是将频谱仪解析出的信号频谱曲线传至天线现场进行天线调整;二是将卫星电视接收机解调出的电视画面中的菜单设置图传至天线现场进行天线调整。此方法经多年实践,行之有效,既方便又精确。 相似文献