Pub Date : 1988-10-23DOI: 10.1109/MILCOM.1988.13410
K. Brayer, S. Natarajan
An investigation of error control coding techniques on an experimental northern latitude meteor burst link is presented. Bit error patterns were obtained and the performance of automatic repeat request (ARQ) and hybrid forward error correction (FEC) with ARQ was examined from the standpoint of probability of message delivery and encountered delays with respect to the message delivery. It is demonstrated that FEC will yield orders of magnitude of improvement in the delivery of messages within a maximum time constraint. The potential gains in extending the usable time duration of a meteor burst channel are on the order of factors of four with successful delivery percentages increased by factors of 50.<>
{"title":"An investigation of ARQ and hybrid FEC-ARQ on an experimental high latitude meteor burst channel","authors":"K. Brayer, S. Natarajan","doi":"10.1109/MILCOM.1988.13410","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13410","url":null,"abstract":"An investigation of error control coding techniques on an experimental northern latitude meteor burst link is presented. Bit error patterns were obtained and the performance of automatic repeat request (ARQ) and hybrid forward error correction (FEC) with ARQ was examined from the standpoint of probability of message delivery and encountered delays with respect to the message delivery. It is demonstrated that FEC will yield orders of magnitude of improvement in the delivery of messages within a maximum time constraint. The potential gains in extending the usable time duration of a meteor burst channel are on the order of factors of four with successful delivery percentages increased by factors of 50.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"4 1","pages":"313-319 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73005329","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13488
D. Manela, D. Schilling
The authors consider a multihop packet radio network, i.e., a spread-spectrum multiple-access (SSMA) network. The network by nature of its operation, has collisions, when two or more users share the same frequency bin at a given time. A solution to the collisions is available by introducing error-correcting codes into the transmitted data. A simple projection code which asymptotically approaches Reiger's bound is suggested and analyzed. Unlike the Reed-Solomon code the projection code is not subject to algebraic constraints and can be easily adjusted to any system parameters such as packet size, code rate, number of bits per hop, and modulation alphabet. The code's structure, features, performances, and implementation, and its advantages over other codes are described.<>
{"title":"Projection codes for burst error correction in SSMA networks","authors":"D. Manela, D. Schilling","doi":"10.1109/MILCOM.1988.13488","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13488","url":null,"abstract":"The authors consider a multihop packet radio network, i.e., a spread-spectrum multiple-access (SSMA) network. The network by nature of its operation, has collisions, when two or more users share the same frequency bin at a given time. A solution to the collisions is available by introducing error-correcting codes into the transmitted data. A simple projection code which asymptotically approaches Reiger's bound is suggested and analyzed. Unlike the Reed-Solomon code the projection code is not subject to algebraic constraints and can be easily adjusted to any system parameters such as packet size, code rate, number of bits per hop, and modulation alphabet. The code's structure, features, performances, and implementation, and its advantages over other codes are described.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"134 1","pages":"839-843 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76559581","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13511
W. Kleinhempel
The author considers question-answering (QA) systems with a number of platforms operating in a common space. The platforms are equipped with interrogators and/or with transponders. The goal of such QA systems is to obtain information about the characteristics of the platforms with transponders at the platforms with interrogators. A general model for QA systems is introduced. Based on this model, it is shown that the probability of identification, the information-theoretical efficiency, and the average cost are quantities suitable for evaluating QA systems. The theory is especially applicable to identification systems for friend or foe. For such a system the advantage offered by spread-spectrum techniques is determined.<>
{"title":"A universal model for question-answering systems with special consideration of modern spread spectrum identification systems","authors":"W. Kleinhempel","doi":"10.1109/MILCOM.1988.13511","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13511","url":null,"abstract":"The author considers question-answering (QA) systems with a number of platforms operating in a common space. The platforms are equipped with interrogators and/or with transponders. The goal of such QA systems is to obtain information about the characteristics of the platforms with transponders at the platforms with interrogators. A general model for QA systems is introduced. Based on this model, it is shown that the probability of identification, the information-theoretical efficiency, and the average cost are quantities suitable for evaluating QA systems. The theory is especially applicable to identification systems for friend or foe. For such a system the advantage offered by spread-spectrum techniques is determined.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"103 1","pages":"1003-1008 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74868770","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13409
S. Wicker
It is shown that the Viterbi decoding algorithm can be modified for use in a type-I hybrid-ARQ (automatic-repeat-request) scheme. Through proper definition, the partial path metrics can be made directly proportional to the error content in a received sequence. Retransmission requests are generated whenever all partial path metrics exceed a fixed threshold before decoding is completed. The threshold may be varied to balance reliability with retransmission frequency. The implementation of this scheme increases reliability performance by several orders of magnitude at the expense of minimal modification to the basic Viterbi decoder and, in some cases, a negligible decrease in throughput.<>
{"title":"An adaptive type-I hybrid-ARQ technique using the Viterbi decoding algorithm","authors":"S. Wicker","doi":"10.1109/MILCOM.1988.13409","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13409","url":null,"abstract":"It is shown that the Viterbi decoding algorithm can be modified for use in a type-I hybrid-ARQ (automatic-repeat-request) scheme. Through proper definition, the partial path metrics can be made directly proportional to the error content in a received sequence. Retransmission requests are generated whenever all partial path metrics exceed a fixed threshold before decoding is completed. The threshold may be varied to balance reliability with retransmission frequency. The implementation of this scheme increases reliability performance by several orders of magnitude at the expense of minimal modification to the basic Viterbi decoder and, in some cases, a negligible decrease in throughput.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"47 1","pages":"307-311 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75143688","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13472
J. McIlvenna, J. Schindler
Current EHF monolithic phased-array technology is assessed; near-term technology needs are evaluated; and future developments in this field are projected. It is noted that such arrays are thought to be able to satisfy cost, real-estate, aerodynamic and radar-cross-section constraints. Test results on multielement monolithic subarrays operating at 20 and 44 GHz are examined. Finally, the connection between current state-of-the-art subarray technology and Smart Skins, the projected omnipotent phased array of the future, is discussed.<>
{"title":"EHF monolithic phased arrays-a stepping-stone to the future","authors":"J. McIlvenna, J. Schindler","doi":"10.1109/MILCOM.1988.13472","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13472","url":null,"abstract":"Current EHF monolithic phased-array technology is assessed; near-term technology needs are evaluated; and future developments in this field are projected. It is noted that such arrays are thought to be able to satisfy cost, real-estate, aerodynamic and radar-cross-section constraints. Test results on multielement monolithic subarrays operating at 20 and 44 GHz are examined. Finally, the connection between current state-of-the-art subarray technology and Smart Skins, the projected omnipotent phased array of the future, is discussed.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"31 1","pages":"731-735 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85918384","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13429
S. Hinedi, A. Polydoros
The authors present and analyze a frequency-noncoherent two-lag autocorrelation statistic for the wideband detection of random BPSK signals in noise-plus-random-multitone interference. It is shown that this detector is quite robust to the presence or absence of interference and its specific parameter values, contrary to the case of an energy detector. The rule assumes knowledge of the data rate and the active scenario under H/sub 0/. It is concluded that the real-time autocorrelation domain and its samples (lags) are a viable approach for detecting random signals in dense environments.<>
{"title":"DS/LPI autocorrelation detection in noise plus random-tone interference","authors":"S. Hinedi, A. Polydoros","doi":"10.1109/MILCOM.1988.13429","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13429","url":null,"abstract":"The authors present and analyze a frequency-noncoherent two-lag autocorrelation statistic for the wideband detection of random BPSK signals in noise-plus-random-multitone interference. It is shown that this detector is quite robust to the presence or absence of interference and its specific parameter values, contrary to the case of an energy detector. The rule assumes knowledge of the data rate and the active scenario under H/sub 0/. It is concluded that the real-time autocorrelation domain and its samples (lags) are a viable approach for detecting random signals in dense environments.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"8 1","pages":"443-447 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86589288","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13464
M. Noakes, J. Cain, J. Nieto, E. Althouse
An algorithm is presented responsible for determining the network connectivity by finding schedules for establishing and disconnecting high-bandwidth satellite crosslinks that use directional antennas. The context is for a stressed satellite network. The algorithm is designed to recover from predictable link outages as well as massive failures. To minimize computational time complexity as well as to improve transient response, the authors use some known graph-theoretical algorithms. The algorithm is designed for robustness in stressed environments and handles multiple failures. Experimental results indicate rapid recovery and therefore utility in a dynamic environment.<>
{"title":"An adaptive link assignment algorithm for dynamically changing topologies","authors":"M. Noakes, J. Cain, J. Nieto, E. Althouse","doi":"10.1109/MILCOM.1988.13464","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13464","url":null,"abstract":"An algorithm is presented responsible for determining the network connectivity by finding schedules for establishing and disconnecting high-bandwidth satellite crosslinks that use directional antennas. The context is for a stressed satellite network. The algorithm is designed to recover from predictable link outages as well as massive failures. To minimize computational time complexity as well as to improve transient response, the authors use some known graph-theoretical algorithms. The algorithm is designed for robustness in stressed environments and handles multiple failures. Experimental results indicate rapid recovery and therefore utility in a dynamic environment.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"2796 1","pages":"683-689 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86497039","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13495
C. Noren
The author presents a tutorial on the use of an expert shell in rapid prototyping of network management systems. Prototyping issues considered include the selection of an expert shell, software architecture, and the development cycle. It is concluded that expert-system shells provide a development environment that can dramatically boost productivity over conventional programming approaches and make rapid prototyping possible. It is noted that the frame- and rule-based nature of the shells fits well in real-time network configuration and fault analysis.<>
{"title":"Rapid prototyping network management systems","authors":"C. Noren","doi":"10.1109/MILCOM.1988.13495","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13495","url":null,"abstract":"The author presents a tutorial on the use of an expert shell in rapid prototyping of network management systems. Prototyping issues considered include the selection of an expert shell, software architecture, and the development cycle. It is concluded that expert-system shells provide a development environment that can dramatically boost productivity over conventional programming approaches and make rapid prototyping possible. It is noted that the frame- and rule-based nature of the shells fits well in real-time network configuration and fault analysis.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"30 1","pages":"891-895 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81697607","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13482
P.D. Karabinis, R. Egri, C. Bennett
Pointing and scanning control algorithms for a two-axis gimbal, inertially stabilized, airborne antenna system are described and evaluated computer simulation. Satisfactory performance is demonstrated in the presence of aircraft maneuvers, with some (expected) degradation for the very-near-zenith antenna states. The antenna scanning algorithm presented is adaptive in its scan rate (to avoid scan distortions due to azimuth rate limiting imposed by the physical antenna system), is simple to implement, and properly accounts for aircraft maneuvering to maintain circular scanning trajectories in inertial space.<>
{"title":"Antenna pointing and scanning control for a two axis gimbal system in the presence of platform motion","authors":"P.D. Karabinis, R. Egri, C. Bennett","doi":"10.1109/MILCOM.1988.13482","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13482","url":null,"abstract":"Pointing and scanning control algorithms for a two-axis gimbal, inertially stabilized, airborne antenna system are described and evaluated computer simulation. Satisfactory performance is demonstrated in the presence of aircraft maneuvers, with some (expected) degradation for the very-near-zenith antenna states. The antenna scanning algorithm presented is adaptive in its scan rate (to avoid scan distortions due to azimuth rate limiting imposed by the physical antenna system), is simple to implement, and properly accounts for aircraft maneuvering to maintain circular scanning trajectories in inertial space.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"15 1","pages":"793-799 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84168676","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 : 1988-10-23DOI: 10.1109/MILCOM.1988.13493
M. Freeman
The author examines the telecommunications local area network, and computer-integrated network control system (TLC, INC) concept which uses modern network management principles to detect service-affecting problems so that corrective action can be applied to restore service. The information is presented to network managers on a high-resolution color graphic workstation in real time. An operation overview of the TLC, INC is presented, and attention is given to such features as global and site display, telecommunications, computer resources, controls, preplans, trend analysis, and performance, audit, and ad hoc reports.<>
{"title":"Telecommunications, local area networks, and computers-integrated network control","authors":"M. Freeman","doi":"10.1109/MILCOM.1988.13493","DOIUrl":"https://doi.org/10.1109/MILCOM.1988.13493","url":null,"abstract":"The author examines the telecommunications local area network, and computer-integrated network control system (TLC, INC) concept which uses modern network management principles to detect service-affecting problems so that corrective action can be applied to restore service. The information is presented to network managers on a high-resolution color graphic workstation in real time. An operation overview of the TLC, INC is presented, and attention is given to such features as global and site display, telecommunications, computer resources, controls, preplans, trend analysis, and performance, audit, and ad hoc reports.<<ETX>>","PeriodicalId":66166,"journal":{"name":"军事通信技术","volume":"150 1","pages":"877-881 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1988-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79849419","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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