Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244059
F. Halloran, J. Bass, A. Senesey, P. Sass, L. Bergman
The Army Tactical Command and Control System (ATCCS) local area network (LAN) is currently based on a commercial Ethernet data interface independent of circuit switched voice subscriber circuits. An evolution which will utilize a mixture of fiber optic wireless LAN technologies and existing US Army communication assets to support data users, followed by complete integration of all services in the local area, is anticipated. The authors describe how the proposed evolution to fiber optic networks in the ATCCS LAN architecture can be accomplished and how the army's Advanced Technology Demonstration Program (ATD) can be utilized to ensure that fiber optic networks will be compatible with existing military communicates. A proposed application of the current Fiber Distributed Data Interface (FDDI) standard to support real-time voice and video services, in addition to data, in a format compatible with the army's evolving ATCCS LAN architecture, is discussed.<>
{"title":"Fiber optic local area networks-a part of the future ATCCS architecture","authors":"F. Halloran, J. Bass, A. Senesey, P. Sass, L. Bergman","doi":"10.1109/MILCOM.1992.244059","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244059","url":null,"abstract":"The Army Tactical Command and Control System (ATCCS) local area network (LAN) is currently based on a commercial Ethernet data interface independent of circuit switched voice subscriber circuits. An evolution which will utilize a mixture of fiber optic wireless LAN technologies and existing US Army communication assets to support data users, followed by complete integration of all services in the local area, is anticipated. The authors describe how the proposed evolution to fiber optic networks in the ATCCS LAN architecture can be accomplished and how the army's Advanced Technology Demonstration Program (ATD) can be utilized to ensure that fiber optic networks will be compatible with existing military communicates. A proposed application of the current Fiber Distributed Data Interface (FDDI) standard to support real-time voice and video services, in addition to data, in a format compatible with the army's evolving ATCCS LAN architecture, is discussed.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134088113","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.243964
G.W. Wroblewski, F. McMahon, M. Kleidermacher, D. W. Ferguson
The authors investigate the lowest-level building block of the EHF amplifier chain, a 1.5-W amplifier module that can be combined for higher power. Based on pseudomorphic high electron mobility transistor (HEMT) technology, this amplifier incorporates 900- mu m gate-width devices that demonstrate a 0.5-W output power and up to 34% power-added efficiency. Four of these are to be combined in the output state to generate 1.5 W of power. An integrated product development approach for the device and modules is being used to focus on reproducibility and manufacturing issues earlier in the development cycle to ultimately lower the overall terminal costs. By designing a common yet flexible amplifier building block, a limited, cost-effective set of subassemblies will meet the requirements for all the various EHF programs, effectively maximizing their application across a broader market.<>
{"title":"Low-cost EHF power amplifiers","authors":"G.W. Wroblewski, F. McMahon, M. Kleidermacher, D. W. Ferguson","doi":"10.1109/MILCOM.1992.243964","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243964","url":null,"abstract":"The authors investigate the lowest-level building block of the EHF amplifier chain, a 1.5-W amplifier module that can be combined for higher power. Based on pseudomorphic high electron mobility transistor (HEMT) technology, this amplifier incorporates 900- mu m gate-width devices that demonstrate a 0.5-W output power and up to 34% power-added efficiency. Four of these are to be combined in the output state to generate 1.5 W of power. An integrated product development approach for the device and modules is being used to focus on reproducibility and manufacturing issues earlier in the development cycle to ultimately lower the overall terminal costs. By designing a common yet flexible amplifier building block, a limited, cost-effective set of subassemblies will meet the requirements for all the various EHF programs, effectively maximizing their application across a broader market.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115650516","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244017
B.A. Pontano, D. Chitre, D. Gokhale
The authors describe work on the implementation and testing of ISDN (integrated services digital network) earth station interfaces for use with existing and future processing satellites. Satellite solutions for both narrowband and broadband ISDN (NISDN and BISDN) are presented. Two NISDN earth station interfaces, one applicable to NASA's Advanced Communications Technology Satellite and the other to the INTELSAT system, have been developed. Ongoing activities include the development of a broadband BISDN earth station interface card that can efficiently handle the asynchronous transfer mode (ATM).<>
{"title":"ISDN over satellite networks","authors":"B.A. Pontano, D. Chitre, D. Gokhale","doi":"10.1109/MILCOM.1992.244017","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244017","url":null,"abstract":"The authors describe work on the implementation and testing of ISDN (integrated services digital network) earth station interfaces for use with existing and future processing satellites. Satellite solutions for both narrowband and broadband ISDN (NISDN and BISDN) are presented. Two NISDN earth station interfaces, one applicable to NASA's Advanced Communications Technology Satellite and the other to the INTELSAT system, have been developed. Ongoing activities include the development of a broadband BISDN earth station interface card that can efficiently handle the asynchronous transfer mode (ATM).<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114817915","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.243993
M. J. Sousa
Conventional analyses of the crosscorrelation radiometer are based on an ideal assumption of a perfectly correlated signal, and Gaussian noise that is uncorrelated between the sensors. In the present work, the author predicts crosscorrelation radiometer performance under less ideal assumptions: non-Gaussian noise, nonzero noise correlation, and imperfect signal correlation. Using a noise model that accounts for uncertainty in the noise and signal parameters, he shows that the crosscorrelation radiometer is sensitive to uncertainty in the noise correlation coefficient. Moreover, even if the noise correlation coefficient is known exactly, detection performance degrade when there is uncertainty in the noise power.<>
{"title":"Limitations of crosscorrelation radiometer performance","authors":"M. J. Sousa","doi":"10.1109/MILCOM.1992.243993","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243993","url":null,"abstract":"Conventional analyses of the crosscorrelation radiometer are based on an ideal assumption of a perfectly correlated signal, and Gaussian noise that is uncorrelated between the sensors. In the present work, the author predicts crosscorrelation radiometer performance under less ideal assumptions: non-Gaussian noise, nonzero noise correlation, and imperfect signal correlation. Using a noise model that accounts for uncertainty in the noise and signal parameters, he shows that the crosscorrelation radiometer is sensitive to uncertainty in the noise correlation coefficient. Moreover, even if the noise correlation coefficient is known exactly, detection performance degrade when there is uncertainty in the noise power.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114848846","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.243982
R. Doyle, A. Sastry
The authors have developed a knowledge-based model of network management and applied it to multihop packet radio networks for fault diagnosis and transmission control. The model has two distinctive features: (1) a distributed control concept and (2) the use of the blackboard paradigm as a knowledge-based environment. The focus of the effort has been on diagnosing faults and other abnormal conditions and applying corrective actions. For transmission control, the authors have implemented a control policy based on observed channel occupancy. At the transport level, the messages are segmented/reassembled, and a facility has been created to allow nonuniform traffic among different source-destination pairs. The authors present a brief description of the software testbed consisting of a packet radio network simulation and the blackboard environment, describe the control rules that have been implemented, and summarize the results obtained.<>
{"title":"Knowledge-based management of multi-hop packet radio networks","authors":"R. Doyle, A. Sastry","doi":"10.1109/MILCOM.1992.243982","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243982","url":null,"abstract":"The authors have developed a knowledge-based model of network management and applied it to multihop packet radio networks for fault diagnosis and transmission control. The model has two distinctive features: (1) a distributed control concept and (2) the use of the blackboard paradigm as a knowledge-based environment. The focus of the effort has been on diagnosing faults and other abnormal conditions and applying corrective actions. For transmission control, the authors have implemented a control policy based on observed channel occupancy. At the transport level, the messages are segmented/reassembled, and a facility has been created to allow nonuniform traffic among different source-destination pairs. The authors present a brief description of the software testbed consisting of a packet radio network simulation and the blackboard environment, describe the control rules that have been implemented, and summarize the results obtained.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114977380","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244038
T. Gulliver, R. Ezers, E. Felstead, J. Wight
Several diversity combining methods which were developed to improve the jamming performance of fast frequency hopped noncoherent M-ary frequency shift keying have been investigated in Rayleigh fading. Based on performance results, the best methods in both jamming and fading are normalized envelope detection (NED), order-statistics (OS) NED, and OS-hard decision majority vote combining. They provide an increased robustness and should not be seriously affected by intelligent jamming and changing jammer strategies. Linear and square-law combining also perform well, but they are not as robust in a changing interference environment.<>
{"title":"The performance of diversity combining for fast frequency hopped NCMFSK in Rayleigh fading","authors":"T. Gulliver, R. Ezers, E. Felstead, J. Wight","doi":"10.1109/MILCOM.1992.244038","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244038","url":null,"abstract":"Several diversity combining methods which were developed to improve the jamming performance of fast frequency hopped noncoherent M-ary frequency shift keying have been investigated in Rayleigh fading. Based on performance results, the best methods in both jamming and fading are normalized envelope detection (NED), order-statistics (OS) NED, and OS-hard decision majority vote combining. They provide an increased robustness and should not be seriously affected by intelligent jamming and changing jammer strategies. Linear and square-law combining also perform well, but they are not as robust in a changing interference environment.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126171086","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.243980
V. M. Mosera
The author provides a technical overview of the Joint Tactical Information Distribution System (JTIDS) Integrated Siting Tool (JIST) and discusses its capability to predict point-to-point connectivity of line-of-sight radio links in both hostile and benign environments. JIST is a prototype network planning and link engineering automated tool developed by the Army to lay down JTIDS networks over a variety of terrain conditions. Specific topics that are discussed include the benefits of integrating electronic map backgrounds for site selection, planning for multipath reflections on JTIDS links, and designing a network to operate in an electronic warfare environment. The initial evaluation of the JIST prototype indicates that it provides significant advantages over manual and semi-automated network planning and link engineering methods. The process of extracting evaluation values from hundreds of topographic contour lines, interpolating to calculate Fresnel zone clearances, and then determining signal loss is accomplished in seconds using JIST. This provides the operator with more time to improve network connectivity, using JIST's automated relay siting capabilities.<>
{"title":"JTIDS Integrated Siting Tool (JIST)-technical overview","authors":"V. M. Mosera","doi":"10.1109/MILCOM.1992.243980","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.243980","url":null,"abstract":"The author provides a technical overview of the Joint Tactical Information Distribution System (JTIDS) Integrated Siting Tool (JIST) and discusses its capability to predict point-to-point connectivity of line-of-sight radio links in both hostile and benign environments. JIST is a prototype network planning and link engineering automated tool developed by the Army to lay down JTIDS networks over a variety of terrain conditions. Specific topics that are discussed include the benefits of integrating electronic map backgrounds for site selection, planning for multipath reflections on JTIDS links, and designing a network to operate in an electronic warfare environment. The initial evaluation of the JIST prototype indicates that it provides significant advantages over manual and semi-automated network planning and link engineering methods. The process of extracting evaluation values from hundreds of topographic contour lines, interpolating to calculate Fresnel zone clearances, and then determining signal loss is accomplished in seconds using JIST. This provides the operator with more time to improve network connectivity, using JIST's automated relay siting capabilities.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129627005","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244131
R. Doyle, I. Shahnawaz, A. Sastry
The authors describe a simulation model to aid in the evaluation of time-critical distributed processing scenarios utilizing a multihop packet radio networks. The simulation model includes a user-defined network, spread-spectrum random-access protocols, end-to-end transport functions, and an error model that includes the effects of interference from concurrent transmissions as well as that of an on-off partial band jammer. An abstract description of a typical distributed processing scenario with hierarchical primary and subtask structures, in which a distributed task is described by a 'script', has been devised. In this representation, a distributed task consists of a primary task and a hierarchy of one or more subtasks. Numerical results were obtained through simulations representing a wide variety of task scenarios. Processing scenarios include assignment of task deadlines with levels of task-subtask hierarchy, and redundant processing on multiple hosts.<>
{"title":"Impact of communication delays and deadline times on distributed processing in packet radio networks","authors":"R. Doyle, I. Shahnawaz, A. Sastry","doi":"10.1109/MILCOM.1992.244131","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244131","url":null,"abstract":"The authors describe a simulation model to aid in the evaluation of time-critical distributed processing scenarios utilizing a multihop packet radio networks. The simulation model includes a user-defined network, spread-spectrum random-access protocols, end-to-end transport functions, and an error model that includes the effects of interference from concurrent transmissions as well as that of an on-off partial band jammer. An abstract description of a typical distributed processing scenario with hierarchical primary and subtask structures, in which a distributed task is described by a 'script', has been devised. In this representation, a distributed task consists of a primary task and a hierarchy of one or more subtasks. Numerical results were obtained through simulations representing a wide variety of task scenarios. Processing scenarios include assignment of task deadlines with levels of task-subtask hierarchy, and redundant processing on multiple hosts.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130940179","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244160
Z. Ding
The author presents results that prove the identifiability of linear finite-dimensional channels with higher than minimum bandwidth based on the use of second-order cyclic statistics only. Since the sampled channel output is also cyclostationary, second-order cyclic statistics of data samples obtained at higher than the Nyquist sampling rate can be used to identify the unknown linear channel. Without the need for higher-order statistics, fractionally spaced equalizers exploiting the cyclostationary property of the channel output may become effective alternatives to conventional schemes based on higher-order statistics.<>
{"title":"On channel identifiability based on second order cyclic spectrum","authors":"Z. Ding","doi":"10.1109/MILCOM.1992.244160","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244160","url":null,"abstract":"The author presents results that prove the identifiability of linear finite-dimensional channels with higher than minimum bandwidth based on the use of second-order cyclic statistics only. Since the sampled channel output is also cyclostationary, second-order cyclic statistics of data samples obtained at higher than the Nyquist sampling rate can be used to identify the unknown linear channel. Without the need for higher-order statistics, fractionally spaced equalizers exploiting the cyclostationary property of the channel output may become effective alternatives to conventional schemes based on higher-order statistics.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131101845","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}
Pub Date : 1992-10-11DOI: 10.1109/MILCOM.1992.244066
A. Andersson
The Swedish Defence Material Administration is currently planning the procurement of an HF radio system for the Swedish Armed Forces, KV 90. Interference measurements in the HF band, which will be used in the KV 90 tender evaluation process to compare different proposals concerning robustness against interference, are reported. A mathematical expression which takes system parameters as input and gives the interference experienced by the system as a result is suggested. Measurements were made to gain knowledge of how receiver bandwidth affects the percentage of interfered channels in an HF radio system. The correlation between interference patterns at different locations was also studied. The results show high correlation for distances up to at least 500 km.<>
{"title":"Experiences from HF interference measurements in Sweden","authors":"A. Andersson","doi":"10.1109/MILCOM.1992.244066","DOIUrl":"https://doi.org/10.1109/MILCOM.1992.244066","url":null,"abstract":"The Swedish Defence Material Administration is currently planning the procurement of an HF radio system for the Swedish Armed Forces, KV 90. Interference measurements in the HF band, which will be used in the KV 90 tender evaluation process to compare different proposals concerning robustness against interference, are reported. A mathematical expression which takes system parameters as input and gives the interference experienced by the system as a result is suggested. Measurements were made to gain knowledge of how receiver bandwidth affects the percentage of interfered channels in an HF radio system. The correlation between interference patterns at different locations was also studied. The results show high correlation for distances up to at least 500 km.<<ETX>>","PeriodicalId":394587,"journal":{"name":"MILCOM 92 Conference Record","volume":"s3-46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130201969","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}
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