The rapid deployment digital satellite network

The ground mobile forces (GMF) satellite digital multichannel radio, which provided the US Marine Corps with the primary transmission links for its switched backbone during Operations Desert Shield and Desert Storm, is discussed. Reliable and highly mobile, the multichannel terminals provided clear and consistent digital pipelines for the Marine Corps circuit switched network and were rapidly deployed on military HWMMV vehicles. The GMF multichannel radios use the defense satellite communication system (DSCS) II and III super-high-frequency (SHF) wideband satellites as retransmission platforms enabling them to be operated theater-wide with no limit on transmission link distance. The deployment and installation of GMF assets in support of the 1st Marine Expeditionary Force during Desert Shield/Desert Storm, including the minimization of outage time due to Sun passage through the radio beam, are described     

US Air Force communications in Desert Storm

The US Central Command Air Forces' (USCENTAF) communications network for Operations Desert Shield and Desert Storm is described. The Central Command Air Forces network utilized 27 SatCom terminals, 27 automatic switches, and 27 terrestrial links and had the responsibility of providing air traffic services across six countries at 24 locations handling 350000 flight operations. The system complexity and air traffic operations, satellite transmission system, terrestrial transmission system, and voice switched network are discussed     

耦合混沌同步和多路保密通信

本文针对混沌系统在通信中具有理想的保密作用，讨论了离散多振子耦合混沌系统的特性和两个耦合混沌系统的同步行为，结果表明，两个耦全合混沌系统通过简单调制能很快同步，并且具有通信保密性和多路传输特性。     

浅析高空应急通信体系的关键技术与系统架构

在重大自然灾害及事件发生后,地面通信系统瘫痪、交通受阻,本文主要探讨如何利用热气球等浮空器平台,承载大容量基站,升空数千米,在受灾区域附近及上空为受灾地区提供地面通信覆盖并确保移动通信畅通的可行性方案。     

The point of the spear [command and control communication system]

The command and control communication system that supported the 24th Infantry Division (Mechanized) during their charge into Iraq in Operation Desert Storm is discussed. The three primary types of communications used were the tactical telephone network, single channel radios, and hard copy or message traffic. Background on the communication systems is presented, and planning for the operation and deployment of the command and control communication system, including command post configurations, are described     

A medical emergency radio communications system (MERCS) for the state of West Virginia

The Medical Emergency Radio Communication System (MERCS) for OH-9 illustrates a new system of emergency medical services (EMS) communications planned for the State of West Virginia. MERCS will be the first multicounty system to be implemented in the State-and will serve as a model for other areas. MERCS will provide a centrally coordinated system of EMS communications for the mountainous rural area of Southern West Virginia. It will exploit the rules of the FCC that provide for use of multichannel equipments and a system of full channel (UHF) mobile relay stations. A vehicle fitted for MERCS will be able to communicate on a common basis through any mobile relay in the system. The mobile relays will provide for communication among all participating public safety agencies, utilizing cross banding where appropriate for interface with the systems of cooperating public safety agencies. The result will be a fully integrated system of communications for EMS.     

移动通信基站直流电源系统容量配置计算

要本文主要通过对移动通信基站通信设备实际负荷的分析及工程实践经验的总结,探讨给出移动通信基站直流电源系统容量较为接近实际的配置方案,以提高移动通信基站直流电源系统的安全性、可靠性、合理性及经济性。     

DISA comes through [C4I architecture]

The development of a command, control, communications, computers, and intelligence (C4I) architecture for the central command (CENTCOM) theater of operations during Operations Desert Shield and Desert Storm is described. CENTCOM C4I merged commercial and military communications systems into a fully integrated network. It employed tactical ground mobile forces (GMF) satellite systems, line-of-sight (LOS) radio systems, unit-level circuit switches (ULCS), and the primary interfaces to strategic systems, the TRI-TAC switching centers, automatic circuit (TTC-39A) and automatic message (TYC-39) switchboards. By the end of the ground war, the CENTCOM strategic network considered of over 100 defense satellite communication system (DSCS) satellite links, nine T-1 systems, over 300, DSN trunks, 26 AUTODIN circuits, and numerous dedicated-user, point-to-point, and data circuits     

浅谈车载应急通信系统构建与展望

在介绍应急通信现状与分类的基础上,从CDMA网络基站子系统的结构、传输系统的多渠道应用、供电系统的要求、载体车辆的结构特点等方面概述了车载应急通信系统的结构。     

Desert Storm communications

An overview of the communication network that supported Operation Desert Storm is presented. The system, which maintained a 98% availability rate, supported 700000 telephone calls and 152000 messages per day. More than 30000 radio frequencies were managed to provide necessary connectivity and to ensure minimum interference. The roles of communications satellites, switched networks and terrestrial systems, and packet-switched networks and computers are described     

Multidisciplinary Applications of Communication Systems in Teleconferencing and Education

This paper describes a laboratory facility and the multidisciplinary research that has been carried out in it relevant to the application of communications technology in such areas as teleconferencing and education. This facility at Carelton University, Ottawa, Canada, provides multichannel multipoint audio and video communications, and information storage and control facilities to simulate a wide variety of uses. The research program, conducted by communication technologists, systems engineers, and social psychologists, is outlined and the results of a number of teleconferencing and educational experiments are presented. The forthcoming communications technology satellite (CTS) Stanford-Carleton Universities Curriculum-Sharing Experiment is described, as are the preparations for a project in the educational applications of communications technology.     

紫外光通信技术发展及应用研究

紫外光通信系统作为一种新型的军事通信系统,具有抗干扰能力强、保密性好、非视距通信以及全方位通信等优点。不易被探测和截收,适用于多种近距离抗干扰通信环境,可满足单兵、军舰、飞机编队之间的保密通讯需要。文中研究总结了国内外紫外光通信的最新进展,并阐述了紫外光通信在海、陆、空三军中可能的应用模式,并揭示了紫外光通信技术对未来战争、现代化国防具有重要的军事价值。     

Demodulation with a Multichannel Estimation Method Using a Reduced Rank Constraint

This paper deals with the Maximum Likelihood Estimation of the multichannel impulse response in a mobile communication system whose base stations are equipped with antennas arrays. The following problem is solved: using the training sequence, find the maximum likelihood multichannel impulse response from one mobile to the base station under a reduced rank constraint in the presence of gaussian noise and jammers with unknown covariance matrix. This method finds applications in demodulation (the reduced rank channel estimate can be used in a Viterbi Algorithm), and experimental results using real signals demonstrate its high performance compared with the standard Minimum Mean Square Error (MMSE) multichannel estimate.     

卫星多路信号收发端机的设计

概述了卫星通信的特点，论述了卫星特种多路信号收发系统的设计。此收发端机是一个将光纤通信技术应用于卫星地测信号传输的设备，其作用是将卫星地测设备中的多路检测信号通过光纤系统传输到远处的控制中心进行检测，以改善卫星姿控系统监测信号质量。此方案与现今已采用的一些方案相比，在系统易用性、可靠性、安全性和降低软硬件投资等方面具有相当大的优势。同时由于采用时分复用及解复用技术，该收发端机传输信号量大、体积小，因此具有极强的需求背景。     

HF radio in Southwest Asia

The use of an HF propagation mode, called rear-vertical incidence skywave (NVIS), by the US Marine Corps is discussed. In an NVIS system, HF signals are radiated nearly vertically. The signal returned from the ionosphere covers the skip zone with an omnidirectional pattern providing a communications range from the transmitter site out to a radial distance of 0 to 300 miles. The development of HF communication systems by the Marine Corps in the 1980s is outlined. The application of several HF communication systems during Operation Desert Storm is described     

Design of 5.9 ghz dsrc-based vehicular safety communication

The automotive industry is moving aggressively in the direction of advanced active safety. Dedicated short-range communication (DSRC) is a key enabling technology for the next generation of communication-based safety applications. One aspect of vehicular safety communication is the routine broadcast of messages among all equipped vehicles. Therefore, channel congestion control and broadcast performance improvement are of particular concern and need to be addressed in the overall protocol design. Furthermore, the explicit multichannel nature of DSRC necessitates a concurrent multichannel operational scheme for safety and non-safety applications. This article provides an overview of DSRC based vehicular safety communications and proposes a coherent set of protocols to address these requirements     

通信机房用精确下送风空调系统

介绍了精确下送风空调系统的原理和系统组成，并对某采用精确下送风空调系统的通信机房的能源利用效率进行测试分析，实测结果表明：该通信机房的能源利用效率达到1．54，比某大型通信集团广东公司通信机楼的平均值优23．0％，节能效果明显。     

IP communications in air traffic control (ATC)

Although established some 60 years ago voice communications is still the sole means to separate and guide aircrafts. Voice communication systems are therefore amongst the most critical installations in air traffic control (ATC). Frequentis was the first to introduce PCM (pulse code modulated) based equipment for ATC worldwide and is on the leading edge of steering into the world of packetized voice communications. VoIP is the emerging voice communication technology which has already proven to provide satisfactory service for commercial applications. However, in ATC a number of requirements exceeding commercial applications have to be met. The voice communication system for ATC integrates radio communication as a prime service. Delays generated by the system therefore directly affect the performance on the radio channel and need to be extremly low. Both the radio control (push-to-talk, PTT) and the voice content need to be processed and delivered in a timely manner. SIP (session initiated protocol) based signalling represents a promising approach to tackle the delay problem. In addition, voice communication systems are required to provide high availability figures. VoIP based systems strongly rely on the communications infrastructure as they are distributed by nature. Resilient packet ring structures allow for these high availablity figures for the communications infrastructure.     

干扰压制系数在通信对抗态势构建中的应用

作战距离是对抗态势构建的关键因素,为进一步提高通信部队基地训练的科学性与合理性,运用战术计算的思想,提出了一种基于通信装备干扰压制系数计算通信距离和干扰距离的方法。设计了通信装备干扰压制系数测试方法,以某型微波接力通信系统为例,测试有效干扰时的通信信号和干扰信号功率,计算其干扰压制系数。利用Egli传播模型和视线距离公式,计算微波接力通信系统的通信距离,及干扰机的干扰距离,为通信部队基地训练中的阵地开设和兵力部署提供技术支撑。     

Telephone traffic in mobile radio communication system using dynamic frequency assignments

Traffic characteristics of a mobile radio communication system using a dynamic channel assignment scheme which has all channels available at all base stations are derived. In the system with one channel, the traffic characteristics in each zone are exactly obtained. For a multichannel operation, some approximation methods are proposed and some simple examples are also presented.