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Proceedings of TCC'94 - Tactical Communications Conference最新文献

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Separation of CDMA spread spectrum signals CDMA扩频信号的分离
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472095
M. Schiff, P. Ready, Elanix
{"title":"Separation of CDMA spread spectrum signals","authors":"M. Schiff, P. Ready, Elanix","doi":"10.1109/TCC.1994.472095","DOIUrl":"https://doi.org/10.1109/TCC.1994.472095","url":null,"abstract":"CDMA spread spectrum signaling techniques have gained increasing importance over the past few years. Long used in military systems such as GPS, they are finding increased usage in the burgeoning cellular communications market. From the view point of an interceptor, CDMA formats pose two problems. First is the spread spectrum nature of the format. This implies that the intercept receiver, without the benefit of the spreading code, must use the fully occupied bandwidth of the signal. This in turn implies that the received SNR can be considerably less than 0 dB. This is, of course, is one reason for using this technique. The second is that in the CDMA multiplexing all users occupy the same bandwidth, at the same time, with the same modulation format. Unless some form of spatial separation is possible, there is little information available from which separation can be obtained. We describe a procedure by which CDMA separation can be obtained. This algorithm is best considered as an initial detection concept by which basic information on the signal is obtained and perhaps handed off to an analysis receiver.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117014055","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 MXF-400 series of radios-communications for the 21st century 21世纪的MXF-400系列无线电通信
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472099
J. F. Keating
{"title":"The MXF-400 series of radios-communications for the 21st century","authors":"J. F. Keating","doi":"10.1109/TCC.1994.472099","DOIUrl":"https://doi.org/10.1109/TCC.1994.472099","url":null,"abstract":"Advances in components and circuit design technologies allow the production of practical and affordable multiband radios which can replace several existing radios and their encryption gear. This results in substantial size and weight reductions which in turn increase the effectiveness of the soldier carrying the radio or the platform on which it is mounted. The paper discusses a family of four radios developed from a common set of modules by Magnavox for sale on an NDI basis. They are intended for manpack, vehicular, fixed station, and airborne use. Standard features include frequency coverage from 30 to 400 MHz, AM, FM, FSK, PSK, and embedded COMSEC. This allows voice and data communication on all current VHF and UHF tactical nets. Options include SINCGARS, Have Quick, and SATURN antiJam, LPI/LPD, 5 kHz, 25 kHz, and DAMA SATCOM, and GPS navigation and timing. The manpack, vehicular, and fixed station radios are in production, while development work continues on the airborne versions. The equipment discussed is: MXF-420 Manpack SATCOM, MXF-430 Tactical Manpack, MXF-440 Airborne SATCOM and MXF-450 Airborne Tactical. Adapters are used to convert the manpack radios to vehicular and fixed station use so that logistics support requirements are reduced by using the same RT-unit to perform a variety of missions.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134563767","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: 2
Wideband frequency selective limiter 宽带频率选择限制器
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472102
E. Kanterakis, F. Bruno
{"title":"Wideband frequency selective limiter","authors":"E. Kanterakis, F. Bruno","doi":"10.1109/TCC.1994.472102","DOIUrl":"https://doi.org/10.1109/TCC.1994.472102","url":null,"abstract":"A novel technique for narrowband/broadband frequency selective limiting in direct sequence-spread spectrum (DS-SS) communications is presented. This technique relies on setting the magnitude response of the received signal Fourier transform to a predetermined function while leaving the phase response unchanged. When the Fourier transform magnitude response of the signal is made constant over the entire signal spectrum, this nonlinear processor will operate as a whitening filter. The processor is particularly attractive in environments where many interferers of different powers coexist in the same frequency band with the desired signal (e.g. wideband HF communications). The only requirement imposed by the processor is that the desired signal must be broadband relative to the interferer(s). This requirement is in general fulfilled by a wide class of communication and radar signals such as DS-SS, hybrid FK/DS-SS, and WB-FM (chirp radar signals).<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124576803","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: 2
Implementation of the single cycle detector using the signal processing workstation 利用信号处理工作站实现单周期检测器
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472106
R. Mills
{"title":"Implementation of the single cycle detector using the signal processing workstation","authors":"R. Mills","doi":"10.1109/TCC.1994.472106","DOIUrl":"https://doi.org/10.1109/TCC.1994.472106","url":null,"abstract":"Detection of unknown signals is often accomplished using energy detection devices, such as the wideband, or total power, radiometer. While this is an effective approach for stationary signals and background noise, much attention has lately focused on the use of other detection methods, such as time-frequency analysis and spectral correlation. This paper investigates the simulation of a single cycle detector, which provides some immunity to the effects of interference and non-stationary noise backgrounds, through the exploitation of the cyclostationary properties of most communications signals. Comparisons of the single cycle detector and the radiometer are made through the use of receiver operating characteristics curves, obtained through simulations using COMDISCO's signal processing workstation (SPW).<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125810546","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: 5
A distributed routing algorithm for multihop packet radio networks with uni- and bi-directional links 具有单向和双向链路的多跳分组无线网络的分布式路由算法
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472111
Carlos Pomalaza-Raez
{"title":"A distributed routing algorithm for multihop packet radio networks with uni- and bi-directional links","authors":"Carlos Pomalaza-Raez","doi":"10.1109/TCC.1994.472111","DOIUrl":"https://doi.org/10.1109/TCC.1994.472111","url":null,"abstract":"In multihop packet radio networks (PRNs) the nodes are not all within direct radio range of each other; to be able to forward the packets to their final destination the nodes must have enough knowledge about the network topology. This information is usually represented in the form of routing and distance tables. On a packet radio network the connectivity among the nodes can change due to several causes such as node or link failures and the presence of mobile nodes which can join or leave the network. This dynamic nature of the network topology requires that the tables at each node be continuously and accurately updated to avoid unnecessary delays or incorrect packet forwarding. The manner in which the packets are forwarded in the method proposed here is called incremental source routing, i.e. each node keeps a routing table which indicates the next hop (a node address) for each network final destination. Each packet is then delivered incrementally by the decisions made by each node in the path from source to destination.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129538321","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: 11
RBECS-an additional tool in the commander's software arsenal rbecs——指挥官软件库中的一个附加工具
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472109
R.C. Randt, J.H. Smith, K.W. Frentzel
{"title":"RBECS-an additional tool in the commander's software arsenal","authors":"R.C. Randt, J.H. Smith, K.W. Frentzel","doi":"10.1109/TCC.1994.472109","DOIUrl":"https://doi.org/10.1109/TCC.1994.472109","url":null,"abstract":"The Revised Battlefield Electronic CEOI System (RBECS) is a software package fielded to supplant the paper booklet signal operation instructions (SOIs), communication electronics operation instructions (CEOIs), and other changing call sign and frequency systems used by the Armed Services and obtained from the National Security Agency (NSA). This paper describes the RBECS software package, its development, its functionality, and how it will supplant the familiar NSA-produced, paper-based changing frequency and call sign systems. It is a chronicle of a PC application superseding an industrial based publication/production effort of considerable size with a budget to match, while simultaneously improving field capabilities.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132431957","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
Modulation choices for LPI/LPD communication systems LPI/LPD通信系统的调制选择
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472090
L.E. Smith
{"title":"Modulation choices for LPI/LPD communication systems","authors":"L.E. Smith","doi":"10.1109/TCC.1994.472090","DOIUrl":"https://doi.org/10.1109/TCC.1994.472090","url":null,"abstract":"Summary form only. The need for low probability of intercept/low probability of detection (LPI/LPD) systems has been recognized by the military and civilian agencies. Industry's first attempts at developing such systems were based upon the use of traditional spread spectrum techniques such as frequency hopping and pseudonoise spreading with a lowered transmitted power. Subsequent research and testing has shown that lowering the power on traditional spread spectrum systems does not make them LPI. Research at the Naval Command Control and Ocean Surveillance Center, RDT&E Division Detachment Warminster, PA (NRaD Detachment Warminster) has centered on the development of waveforms that are not detectable using either energy detectors or feature detectors. NRaD has sponsored corporate research and development, as well as performed in house research and development of communication waveforms that are intended to defeat various types of feature detectors. This paper addresses potential threats to communication signals and then discusses the results of various programs to develop waveforms that defeat some of these threats. The detection of LPI/LPD signals will most likely be performed with special advanced detectors, and not simple radio systems. These advanced detectors mostly fall into a category known as feature detectors. As the name implies, feature detectors target certain highly detectable features of the LPI waveform such as the carrier, chip rate, hop rate, etc. Concerns for airborne LPI are also discussed.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127767322","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: 2
Design, simulation, and operation of an instrumented HF digital network for USAF's Air Mobility Command 为美国空军空中机动司令部设计、模拟和操作仪表HF数字网络
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472115
K.H. Wickwise, P.L. Norden, R.P. Levreault, R. G. Bland
{"title":"Design, simulation, and operation of an instrumented HF digital network for USAF's Air Mobility Command","authors":"K.H. Wickwise, P.L. Norden, R.P. Levreault, R. G. Bland","doi":"10.1109/TCC.1994.472115","DOIUrl":"https://doi.org/10.1109/TCC.1994.472115","url":null,"abstract":"The USAF Air Mobility Command (AMC) has been developing an Information Processing System (IPS), with associated communications, for worldwide command and control of Air Force deliveries. The IPS must quickly process, coordinate, and send information about transport flights to fixed air bases and \"contingency bases\" (usually in foreign countries) set up to handle flights to areas of conflict or emergency. The messages, of various lengths and priorities, have one or more recipients, and copies are usually sent to one or more nodes besides the primary recipient. The main performance requirement of the IPS communications system (which uses several media) is the rapid delivery of error-free messages. For IPS communications over high frequency (HF) radio, this is accomplished with an automatic repeat request (ARQ) protocol, aided by powerful error-correction and signal-processing firmware in an HF data modem, which is described. Also described in detail is the Mitre data acquisition system for monitoring the network.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132826187","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
Performance comparison of slotted and unslotted DS/SSMA networks 有槽和无槽DS/SSMA网络的性能比较
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472132
P.W. de Graaf, J. Lehnert
{"title":"Performance comparison of slotted and unslotted DS/SSMA networks","authors":"P.W. de Graaf, J. Lehnert","doi":"10.1109/TCC.1994.472132","DOIUrl":"https://doi.org/10.1109/TCC.1994.472132","url":null,"abstract":"Throughput and delay for both slotted and unslotted direct-sequence spread-spectrum multiple-access (DS/SSMA) packet radio networks are compared. In both systems, each user employs a newly chosen random signature sequence for each bit in a transmitted packet. Accurate packet success probabilities for both systems are computed using an improved Gaussian approximation technique. Average throughput and delay results are obtained for varying levels of block error correction. The slotted system is shown to have better performance than the unslotted system in all cases.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134407783","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
Advanced ASW sonobuoy receivers 先进的反潜声纳浮标接收器
Proceedings of TCC'94 - Tactical Communications Conference Pub Date : 1994-05-10 DOI: 10.1109/TCC.1994.472105
J. J. Miller
{"title":"Advanced ASW sonobuoy receivers","authors":"J. J. Miller","doi":"10.1109/TCC.1994.472105","DOIUrl":"https://doi.org/10.1109/TCC.1994.472105","url":null,"abstract":"Summary form only given, as follows. The development of extremely high sampling rate, high dynamic range A/D converters has resulted in the feasibility of a mostly digital telemetry receiver. The Naval Command and Control and Ocean Surveillance Center, under Office of Navy Research funding is developing an advanced ASW receiver which implements RF channel filtering, null steering, direction finding and information demodulation in a high speed digital signal processor. This paper describes the requirements for the receiver, the overall system architecture chosen for this application, the A/D converter characteristics required to achieve the desired dynamic range and to implement the null steering functions, and the features of the DSP algorithms, and the high speed processor which implements them. Potential application of this technology to commercial and military communications are also discussed.<<ETX>>","PeriodicalId":206310,"journal":{"name":"Proceedings of TCC'94 - Tactical Communications Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114755948","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
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