广播电视卫星传输的抗干扰研究

随着国际经济竞争的不断激烈,政治斗争领域不断拓展,广播电视卫星传输受到恶意攻击的报道出现频率也不断增加.加上卫星信号传输过程中会受到相关设施设备、地理环境、空间环境的影响,卫星信号质量容易受到干扰,导致电视节目信号不稳定.因此本文在分析干扰广播电视卫星传输的因素的基础上,给出了广播电视卫星传输的抗干扰措施,以期提高卫星信号质量.     

卫星接收信号的干扰和抗干扰

利用通信卫星或广播电视直播卫星传输广播电视信号已经被广泛使用。然而,在卫星地面接收信号时会遇到各种形式的干扰,本文就接收信号的干扰和抗干扰作一分析,并指出解决干扰的措施。     

卫星地球站抗干扰技术研究

广播电视的卫星传输系统采用开放的、无线远程、点对面的传输模式,极易受到干扰。文章结合我国卫星地球站的实际情况,针对卫星广播电视的信号传输特点,对干扰现象进行了分析,对抗干扰技术进行了研究。     

广播电视卫星传输安全的影响因素及解决策略

广播卫星一般处在距离地面三万六千公里的宇宙空间,卫星信号被从这么遥远的距离发送到地面基站,会受到多种因素干扰,例如:地球大气层干扰、卫星系统自身因素干扰以及人为因素干扰等,这些干扰严重影响着卫星信号传播。本文主要分析了广播卫星传输安全影响因素,并从几个方面研究了广播电视卫星传输安全技术。     

卫星传输空间电磁干扰问题研究

卫星通信技术已经成为广播电视重要的传输手段,是国家舆论战线的主阵地,对卫星通信信号的质量有极高的要求。而卫星信号传输距离远,在传播过程中容易受到传输空间的各种干扰,严重影响信号质量,其中传输空间电磁干扰是对卫星传输信号影响较大的一种,本文主要就卫星传输空间电磁干扰问题进行分析,探讨抗干扰措施,提高卫星通信信号质量。     

影响卫星数字视频广播信号传输的主要因素

卫星数字电视具有覆盖范围大、传送质量高、节约了卫星资源优点,提高了广播电视的人口覆盖率。有力地推动了广播电视事业的发展。虽然卫星数字视频广播具有很多优点, 但是其信号的传输也受某些因素的影响,如自然现象的影响、卫星信号间的干扰、上行传输系统以及下行接受系统的不完善所造成的影响等。以下对影响卫星数字视频广播(DVB-S)信号传输的主     

卫星地球站抗干扰技术研究

广播电视的卫星传输系统采用开放的、无线远程、点对面的传输模式，极易受到干扰。文章结合我国卫星地球站的实际情况，针对卫星广播电视的信号传输特点，对干扰现象进行了分析，对抗干扰技术进行了研究，提出了一种通用的卫星地球站抗干扰技术及其实现方法。     

广播电视卫星传输常见的干扰因素及解决方式

卫星传输是广播电视信号传输的主要方式,在传输中由于各种因素的干扰,经常出现信号变弱或者中断的现象。本文就凭借着已多年的经验对影响信号传输的干扰因素进行分析,提出相应的解决方案,希望对以后的研究和操作起到一定的参考作用。     

卫星上行站抗干扰技术分析

本文针对广播电视信号卫星传输的特点,对干扰的分类和形成的过程进行了分析,对卫星上行站常用的抗干扰措施和卫星上行站的抗干扰系统进行了介绍.     

影响卫星数字视频广播（DVB—S）信号传输的主要因素

卫星数字电视具有覆盖范围大、传送质量高，节约卫星资源等优点，提高了广播电视的人口覆盖率，有力地推动了广播电视事业的发展。虽然卫星数字视频广播具有很多优点，但是其信号的传输也受某些因素的影响．如自然现象，卫星信号间的干扰、上行传输系统以及下行接收系统的不完善等所造成的影响。以下对影响卫星数字视频广播(DVB-S)信号传输的主要因素分别予以介绍。     

Transmission System for the Television Broadcasting Satellite

Standardization of transmission system for television satellite broadcasting with multiple sound and/or data signals for an operational broadcasting satellite system is under study in Japan. Based upon result obtained from the BSE experiment, several transmission systems have been developed at the NHK (Japan Broadcasting Corporation).     

直播星信号干扰预警的实现

卫星电视信号传输网络是国家重要的基础网络,由于其公用性、开放性等特点,广播电视节目信号在传输过程中容易受到干扰。近年来随着科学技术的快速发展,空中各类电波增多且发射功率越来越大,干扰信号的种类和干扰方式不断增多,对卫星电视信号的正常传输影响越来越大。本文简要介绍了干扰信号的分类、产生根源及基本排除方法。信号稳定时生成模板,根据卫星信号受干扰时引起的载波变化,当信号受干扰时利用软件准确预警。     

卫星地球站抗5G干扰研究和实践

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。     

Satellite direct broadcast

A brief history and commentary on the development of satellite direct broadcast (direct broadcast satellite, or DBS) to small user terminals is given, and the interrelations among the technical, economic, and political aspects are discussed. The fundamental technical problems in the transmission of video and audio directly to small user terminals are reviewed at a basic level, and points of particular interest relating to DBS are highlighted. The effects of improved transmission systems using multiplexed analog components and of high-definition television are related to the satellite transmission problems. The conflicting requirements of performance, compatibility with existing equipment, competition with other means of transmission, and vested political interests are pointed out. A reasonably complete summary of existing programs, both true DBS and near DBS, is given     

论影响卫星信号传输的主要因素

卫星通信具有非常广泛的应用范围，如卫星电视、现代教育、GPS、测绘、气象、军事等领域，都广泛应用了卫星通信技术。同时，影响卫星信号传输的因素也日渐成为社会发展过程中需要关注的焦点问题。为促进相关技术的发展，文中对影响卫星信号传输的主要因素进行了阐述，希望能为相关人士提供借鉴。     

An Assessment of the Potential Terrestrial Interference Due to Direct Broadcast Satellite Television Receivers

The potential interference of spurious, radiation from the local oscillators of direct broadcast satellite (DBS) television receivers to terrestrial 11 GHz microwave radio services is examined. Typical parameters for DBS receivers are identified and used in a computer simulation to calculate the aggregate effect of a large number of units distributed about a terrestrial repeater site. The results of the analysis show that for a local oscillator frequency of 11.2 GHz, DBS LO leakage of -70 dBW/unit, and a density of 2600/km²(1000/mi²) the cumulative interference power would be comparable to the thermal noise level of a terrestrial radio system under realistic conditions. Methods of scaling the results for other system parameters are also presented.     

Simulation of TV Transmission Over the Communications Satellite Channel

Time-domain simulation is used to evaluate NTSC and multiplexed analog component (MAC) television transmission over the Communications satellite channel using analog frequency modulation. The simulation program is used to measure transmission impairments caused by thermal noise, distortion resulting from spectral truncation by the band-limited channel, AM-to-PM conversion in the satellite TWTA, and the onset of impulse noise in the FM demodulator as the receiver approaches threshold. Although subjective testing is necessary before final comparisons can be made, the simulation results give insight into the sources of transmission impairments and the tradeoffs among certain transmission parameters.     

Satellite DAB

Service requirements for digital audio broadcasting (DAB) from satellites are presented, and plans for implementing such systems in various countries are surveyed. Technical and economic constraints, including satellite transmitter power, frequencies of operation, transmission bandwidth, service interference and user receiver design are discussed particularly for DAB systems employing mobile receiving terminals where transmission outage from blockage and multipath fading must be addressed. Transmission performance improvement techniques such as spatial diversity, modulation, coding and interleaving are described. An illustration of a specific satellite DAB system design is presented to show the technical and economic feasibility of such new services.     

雨衰和雪衰对广播电视卫星传输的影响及改善措施

随着我国科学技术水平的不断提升,广播电视卫星传输技术得到了进一步发展。在实际的卫星传输过程中,信号质量会受到各种因素的影响,其中包括雨雪等自然因素导致的信号衰减。因此,详细分析雨衰和雪衰对广播电视卫星传输的影响,并结合实际情况提出相应的改善措施,期望能够为相关工作者提供参考。     

多路全数字卫星节目收录系统的设计与实现

介绍了多路全数字化卫星节目收录系统的设计与实现,该系统从卫星上接收复用的TS码流送入到PC机,由软件进行解复用后保存为文件,用于后期的编辑制作和播出使用.该系统已研制成功并应用在多家广电网络公司.