发布求助
文献互助 智能选刊 最新文献

MILCOM 1984 - IEEE Military Communications Conference最新文献

筛选
英文 中文
Commercial Applications of Encrypted Signals 加密信号的商业应用
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795017
M. Davidov, V. Bhaskaran, T. Wechselberger
{"title":"Commercial Applications of Encrypted Signals","authors":"M. Davidov, V. Bhaskaran, T. Wechselberger","doi":"10.1109/MILCOM.1984.4795017","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795017","url":null,"abstract":"The use of encryption technology in the delivery of premium television is described. Signal security concepts such as scrambling, encryption, key-management etc. as applied in the ORION and SIGMA systems are discussed. In order to asess the effects of transmission link and system induced impairments, an analytical procedure is developed for the encryption method used in ORION/SIGMA. System performance curves obtained from the analysis are presented. Finally, potential applications of ORION, SIGMA systems in the secure transmission of non-video information is discussed.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129326930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Demodulation/Remodulation Performance for a Class of Digitally Phase Modulated Signals 一类数字相位调制信号的解调/重调性能
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794908
A. Weinberg, R. Harkness
{"title":"Demodulation/Remodulation Performance for a Class of Digitally Phase Modulated Signals","authors":"A. Weinberg, R. Harkness","doi":"10.1109/MILCOM.1984.4794908","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794908","url":null,"abstract":"Demodulation/remodulation in a multi-link (e.g., satellite) communication system may take on a variety of forms and may satisfy one or more system requirements, such as anti-jam protection. The focus of this paper is on a specific signal structure that has broad applicability and a specific demod/remod scheme employed by the Space Shuttle. The signal is characterized by a residual carrier with binary data PSK modulated onto a subcarrier and additional data phase modulated onto the carrier. The signal is demodulated to baseband in a broad bandwidth, hard-limited and suppressed carrier/BPSK remodulated for final transmission. This paper analytically determines the spectral density of the hard-limited baseband signal and applies the result to bit error rate (BER) evaluation. Computed results display illustrative spectra and BER results, which are functions of: carrier and subcarrier data rate, modulation indices and signal-to-noise ratio (SNR). Hard-limiter suppression and enhancement factors are also explicitly treated; the relationships of these factors to modulation indices - especially for high SNR values - are particularly noted.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132157353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surrogate Satellite Applications and Survivability 替代卫星的应用和生存能力
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795009
S. Segner, F. Giordano
{"title":"Surrogate Satellite Applications and Survivability","authors":"S. Segner, F. Giordano","doi":"10.1109/MILCOM.1984.4795009","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795009","url":null,"abstract":"The Tactical Satellite Communications System (TACSATCOM) established by the DOD will provide enhanced communications for US Army Ground Mobile Forces (GMF) and other services. However, in a crisis situation or during intense combat, increased communications will limit the number of users of TACSATCOM channels aboard DOD satellites to only those having top mission priority. Additionally, usage of the GMF equipment will be limited when the satellite failure occurs. The concept of launching an airborne short-time surrogate has been studied. The SHF surrogate satellite channel and the factors which were found to impact significantly on its cost-effectiveness were studied. Slight modifications to the GMFSATCOM terminals are shown to be necessary.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130508623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
LPI Optical Communication System LPI光通信系统
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795007
J. Barry, G. Mecherle
{"title":"LPI Optical Communication System","authors":"J. Barry, G. Mecherle","doi":"10.1109/MILCOM.1984.4795007","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795007","url":null,"abstract":"An optical communication system based on the use of the GaAs laser diode as the light source has been developed and demonstrated. The system uses one inch transmit optics to provide a beam-width of about 18 mrad and has a receive field of view of about 35 mrad with 2 inch optics. A narrow band optical filter is used in the receiver to reduce optical noise in the detector so that operation at night and during daylight hours is possible. The system has low probability of intercept (LPI) properties as a result of the narrow transmit beam, the low power transmitted and operating wavelength which is invisible to the human eye. The system has weight of 52 pounds and requires about 167 watts of electrical power during operation.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"44 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123213308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The Contractor's Responsibilities in Space System Frequency Management 承包商在空间系统频率管理中的责任
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794881
R. Ford
{"title":"The Contractor's Responsibilities in Space System Frequency Management","authors":"R. Ford","doi":"10.1109/MILCOM.1984.4794881","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794881","url":null,"abstract":"","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116699283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The videocipherTM | scrambling system 视频密码加扰系统
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795015
P. Moroney, K. Gilhousen, W. Paik
{"title":"The videocipherTM | scrambling system","authors":"P. Moroney, K. Gilhousen, W. Paik","doi":"10.1109/MILCOM.1984.4795015","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795015","url":null,"abstract":"The VideoCipherTM I scrambling system is a very secure, very high quality system for satellite transmission of stereo audio and video program material. Stereo audio is transmitted digitally and is encrypted bit-by-bit, rendering the scrambled format completely unintelligible. Video is scrambled via a time-shuffling algorithm under control of a cryptographic keystream, which ensures that the scrambled picture is totally unrecognizable. Security is based on the National Bureau of Standards' DES encryption standard, which is employed to generate keystream for encryption and scrambling. Control of the VideoCipher I system is also embedded in the scrambled waveform, with a tiering hierarchy that allows rapid control of millions of Descramblers. Overall, the system performs to an extremely rigorous set of performance specifications, with over 85 dB of audio dynamic range and 57 dB of weighted video signal-to-noise ratio.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131175079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SBPSK: A Robust Bandwidth-Efficient Modulation for Hard-Limited Channels SBPSK:一种硬限制信道的鲁棒带宽高效调制
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794893
M. Dapper, T. Hill
{"title":"SBPSK: A Robust Bandwidth-Efficient Modulation for Hard-Limited Channels","authors":"M. Dapper, T. Hill","doi":"10.1109/MILCOM.1984.4794893","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794893","url":null,"abstract":"A family of constant-envelope modulation formats is described in which good spectral containment is achieved through the use of controlled phase trajectories. The phase trajectory of shaped BPSK (SBPSK) in particular is such that it can be considered a PSK/FSK hybrid. For one member of this family, 50% SBPSK, extensive analytical results are presented, including sensitivities to filter bandwidths, timing jitter, phase jitter, and frequency error. In addition, performance in the presence of multiple adjacent channel interferers in a hard-limited satellite channel is analyzed and performance comparisons to conventional modulations are presented.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115340746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 50
Spectrum/Orbit Utilization Program for Geostationary Satellites 地球静止卫星频谱/轨道利用方案
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794879
E. F. Miller
{"title":"Spectrum/Orbit Utilization Program for Geostationary Satellites","authors":"E. F. Miller","doi":"10.1109/MILCOM.1984.4794879","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794879","url":null,"abstract":"Mutual interferences among geostationary satellite communication systems determine the permitted spacing between satellites and the limits on the capacity of the orbit/spectrum resources available. This paper describes the \"Spectrum/Orbit Utilization Program,\" a computer program for analyzing the mutual interferences among communication satellite systems. Capabilities of the program are described. Inputs, models used, program operations, and program outputs are given. To show application of the program, an example scenario is analyzed for fixed satellites providing domestic service to North America.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124933865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A 150 km Undersea Repeaterless Lightwave Transmission Link Operating at a 1.55 Micron Wavelength 150公里的海底无中继光波传输链路，工作波长为1.55微米
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4795003
R. Lynch
{"title":"A 150 km Undersea Repeaterless Lightwave Transmission Link Operating at a 1.55 Micron Wavelength","authors":"R. Lynch","doi":"10.1109/MILCOM.1984.4795003","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4795003","url":null,"abstract":"The data and power transmission system described herein spans some 150 km between a shore site and an off-shore floating platform. The full-duplex data link will be one of the first operational applications of undersea lightwave technology anywhere in the world when it is turned over for service early in 1985. At a line rate of 3.088 megabaud it achieves this distance without undersea electronics by taking advantage of leading-edge laser, photo detector, fiber, and undersea cable technology in the 1.55 micron wavelength range. Additionally, over half a kW of power is delivered to the platform over the power conductor of the undersea cable, which also functions as a strength member and protection for the glass fibers. A rather unique scheme for sea-bottom to surface-platform cabling and attachment is also described.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123951094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Telecommunications: Government Needs and Commercial Contributions 电信:政府需求和商业贡献
MILCOM 1984 - IEEE Military Communications Conference Pub Date : 1984-10-01 DOI: 10.1109/MILCOM.1984.4794900
L. L. Stine
{"title":"Telecommunications: Government Needs and Commercial Contributions","authors":"L. L. Stine","doi":"10.1109/MILCOM.1984.4794900","DOIUrl":"https://doi.org/10.1109/MILCOM.1984.4794900","url":null,"abstract":"Government needs for modern telecommunications services are based on a need to improve coordination and flow of information among a large worldwide organization and its components. Interoperability among diverse terminals and networks is essential. Security, survivability, and flexibility in deployment is often required. Various developments in the non-government area can improve interoperability and coordination between diverse government networks. This paper provides an overview of these developments.","PeriodicalId":375763,"journal":{"name":"MILCOM 1984 - IEEE Military Communications Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125308325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信