A packet processing performance model has been derived from the development of a VLSI packet processor to support CCSDS (Consultative Committee for Space Data Systems) telemetry data processing. The model provides a powerful tool for characterizing the performance of a real-time packet processing system considering data rate, processing speed frame, and packet size. Using this model, a system processing boundary can be determined for a given set of operational conditions. It also points the way to further enhancement and optimization of the system design.<>
{"title":"A performance model for realtime packet processing","authors":"J. Shi, G. Grebowsky","doi":"10.1109/NTC.1992.267873","DOIUrl":"https://doi.org/10.1109/NTC.1992.267873","url":null,"abstract":"A packet processing performance model has been derived from the development of a VLSI packet processor to support CCSDS (Consultative Committee for Space Data Systems) telemetry data processing. The model provides a powerful tool for characterizing the performance of a real-time packet processing system considering data rate, processing speed frame, and packet size. Using this model, a system processing boundary can be determined for a given set of operational conditions. It also points the way to further enhancement and optimization of the system design.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116404900","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}
The authors present a novel two-dimensional SAR (synthetic aperture radar) imaging technique using DFT (discrete Fourier transform) processing of linear arrays with transverse motion operating in the sequential mode (DFTSQM). High resolution images are generated without the need of range gating. Multiple target detection is performed on the basis of angular (azimuth and elevation) coordinates. No phase shifting or tapering hardware is required. Computer simulation and an example show the impulse invariance, and indicate that the new system's performance is better than standard SAR processing. The duration of the transmitted pulse can be increased substantially because range resolution does not depend on bandwidth. It follows that the average transmitted power is increased, which improves the signal-to-noise ratio of the system. In addition, the receiver and display devices can operate with a narrower bandwidth, which results in a major cost reduction.<>
{"title":"Two-dimensional SAR imaging using linear arrays with transverse motion","authors":"B. Mahafza, M. Sajjadi","doi":"10.1109/NTC.1992.267880","DOIUrl":"https://doi.org/10.1109/NTC.1992.267880","url":null,"abstract":"The authors present a novel two-dimensional SAR (synthetic aperture radar) imaging technique using DFT (discrete Fourier transform) processing of linear arrays with transverse motion operating in the sequential mode (DFTSQM). High resolution images are generated without the need of range gating. Multiple target detection is performed on the basis of angular (azimuth and elevation) coordinates. No phase shifting or tapering hardware is required. Computer simulation and an example show the impulse invariance, and indicate that the new system's performance is better than standard SAR processing. The duration of the transmitted pulse can be increased substantially because range resolution does not depend on bandwidth. It follows that the average transmitted power is increased, which improves the signal-to-noise ratio of the system. In addition, the receiver and display devices can operate with a narrower bandwidth, which results in a major cost reduction.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117315021","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}
Two results concerning clutter estimation are presented. First, the use of frequency diversity improves adaptive detection performance to a greater extent than has been reported for optimum processors under an equal transmit energy constraint. Second, the MPGLR (multiband polarization generalized likelihood ratio) algorithm improves detection performance in the polarization domain and, in contrast to adaptive single-band processing under severely limited observation conditions, can approach the performance of the optimum processor. It is concluded that multiband processing improves performance by increasing the quantity of independent and identically distributed data vectors available for clutter estimation. A means of further improving detection of small targets is presented. This was accomplished by modifying the threshold of the MPGLR test according to the similarity of the maximum likelihood estimate of the target vector to the model assumption.<>
{"title":"Improved radar detection using adaptive multiband polarization processing","authors":"R. Brown, Hong Wang","doi":"10.1109/NTC.1992.267900","DOIUrl":"https://doi.org/10.1109/NTC.1992.267900","url":null,"abstract":"Two results concerning clutter estimation are presented. First, the use of frequency diversity improves adaptive detection performance to a greater extent than has been reported for optimum processors under an equal transmit energy constraint. Second, the MPGLR (multiband polarization generalized likelihood ratio) algorithm improves detection performance in the polarization domain and, in contrast to adaptive single-band processing under severely limited observation conditions, can approach the performance of the optimum processor. It is concluded that multiband processing improves performance by increasing the quantity of independent and identically distributed data vectors available for clutter estimation. A means of further improving detection of small targets is presented. This was accomplished by modifying the threshold of the MPGLR test according to the similarity of the maximum likelihood estimate of the target vector to the model assumption.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126627028","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}
The authors examine the detection performance of the GLR (generalized likelihood ratio) algorithm in nonhomogeneous/nonstationary clutter environments which lead to nonidentical distribution of secondary (training) data. For two common types of nonhomogeneity, i.e., the so-called signal contamination and clutter edge, the asymptotic detection performance is derived and compared to simulation. These asymptotic results are relatively simple to use and predict the GLR performance in nonhomogeneous environments quite well. The GLR performance loss due to the nonhomogeneity is also evaluated. It is found that the generalized angle between the desired and contaminating signals plays a very important role in the study of the effect of the signal contamination. It is also found that the performance degradation due to the clutter edge relies largely on the clutter spectrum spread and target-clutter Doppler separation.<>
{"title":"New results on integrated adaptive filtering and CFAR processing","authors":"H. Wang, L. Cai","doi":"10.1109/NTC.1992.267881","DOIUrl":"https://doi.org/10.1109/NTC.1992.267881","url":null,"abstract":"The authors examine the detection performance of the GLR (generalized likelihood ratio) algorithm in nonhomogeneous/nonstationary clutter environments which lead to nonidentical distribution of secondary (training) data. For two common types of nonhomogeneity, i.e., the so-called signal contamination and clutter edge, the asymptotic detection performance is derived and compared to simulation. These asymptotic results are relatively simple to use and predict the GLR performance in nonhomogeneous environments quite well. The GLR performance loss due to the nonhomogeneity is also evaluated. It is found that the generalized angle between the desired and contaminating signals plays a very important role in the study of the effect of the signal contamination. It is also found that the performance degradation due to the clutter edge relies largely on the clutter spectrum spread and target-clutter Doppler separation.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669109","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}
The author discusses the existing broadband integrated services digital network (BISDN) service and delivery method as defined by the International Consultative Committee for Telephone and Telegraph (CCITT) and satellites' role in provisioning those services. The NASA high-data-rate Advanced Communications Technology Satellite (ACTS) experiment efforts are also summarized. The ACTS Program will conduct high-data-rate (HDR) experiments that will be applicable to the emerging broadband services of the telephony market. The deployment of the BISDN may require a period of time extending over one or more decades, as operators seek to find the most economic means of evolving current networks to the BISDN. Satellites will find a role in this evolutionary process as a transition service, alternate service, and service of choice. The extent of satellites' role in the deployment of BISDN will depend on the development of standards, market use of the services, and the capability of satellite systems to provide the desired services.<>
{"title":"High data rate applications of ACTS technology","authors":"T. vonDeak","doi":"10.1109/NTC.1992.267888","DOIUrl":"https://doi.org/10.1109/NTC.1992.267888","url":null,"abstract":"The author discusses the existing broadband integrated services digital network (BISDN) service and delivery method as defined by the International Consultative Committee for Telephone and Telegraph (CCITT) and satellites' role in provisioning those services. The NASA high-data-rate Advanced Communications Technology Satellite (ACTS) experiment efforts are also summarized. The ACTS Program will conduct high-data-rate (HDR) experiments that will be applicable to the emerging broadband services of the telephony market. The deployment of the BISDN may require a period of time extending over one or more decades, as operators seek to find the most economic means of evolving current networks to the BISDN. Satellites will find a role in this evolutionary process as a transition service, alternate service, and service of choice. The extent of satellites' role in the deployment of BISDN will depend on the development of standards, market use of the services, and the capability of satellite systems to provide the desired services.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130169679","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}
Describes the general requirements for network security in the US Department of Defense environment. The work was done as part of an effort to develop a network security product called DRAGONFLY. The authors document the requirements for computer security in a network environment, as described by four government needs statements. This set of requirements is refined to a set of desirable characteristics that point toward what a network security product must supply in order to be successful.<>
{"title":"Network security","authors":"D. Snow, W. Chang","doi":"10.1109/NTC.1992.267863","DOIUrl":"https://doi.org/10.1109/NTC.1992.267863","url":null,"abstract":"Describes the general requirements for network security in the US Department of Defense environment. The work was done as part of an effort to develop a network security product called DRAGONFLY. The authors document the requirements for computer security in a network environment, as described by four government needs statements. This set of requirements is refined to a set of desirable characteristics that point toward what a network security product must supply in order to be successful.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121188702","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}
Relates the performance of enabling hardware technologies to software radio requirements, portending a decade of shift from hardware radios toward software intensive approaches. Such approaches require efficient use of computational resources through topological consistency of radio functions and host architectures. This leads to a layered topology oriented design approach encapsulated in a canonical open architecture software radio model. This model underscores challenges in simulation and computer-aided design (CAD) tools for radio engineering. It aso provides a unified mathematical framework for quantitative analysis of algorithm structures, host architectures, and system performance for radio engineering CAD environments of the 1990s.<>
{"title":"Software radios-survey, critical evaluation and future directions","authors":"J. Mitola","doi":"10.1109/NTC.1992.267870","DOIUrl":"https://doi.org/10.1109/NTC.1992.267870","url":null,"abstract":"Relates the performance of enabling hardware technologies to software radio requirements, portending a decade of shift from hardware radios toward software intensive approaches. Such approaches require efficient use of computational resources through topological consistency of radio functions and host architectures. This leads to a layered topology oriented design approach encapsulated in a canonical open architecture software radio model. This model underscores challenges in simulation and computer-aided design (CAD) tools for radio engineering. It aso provides a unified mathematical framework for quantitative analysis of algorithm structures, host architectures, and system performance for radio engineering CAD environments of the 1990s.<<ETX>>","PeriodicalId":448154,"journal":{"name":"[Proceedings] NTC-92: National Telesystems Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133464156","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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