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[Proceedings] NTC-92: National Telesystems Conference

19-20 May 1992

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Displaying Results 1 - 25 of 59
  • NTC-92. National Telesystems Conference (Cat. No.92CH3120-3)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (190 KB)
    Freely Available from IEEE
  • Organic photonics: materials and devices strategy for computational and communication systems

    Publication Year: 1992, Page(s):9/7 - 915
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    It is pointed out that passive and electroactive organic optical materials open new possibilities for fabricating enhanced and novel photonic devices. Low deposition temperatures and benign chemistry permit multiple-layer structures and integration of the organic materials directly with semiconductor electronics. The electrooptical properties of the active organics are comparable to or larger than... View full abstract»

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  • Inmarsat integrity channels for global navigation satellite systems

    Publication Year: 1992, Page(s):3/5 - 3/8
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    It is pointed out that the transmission of integrity information using a signal format compatible with GPS (Global Positioning System) and relayed through a geostationary satellite repeater will be critical in achieving high integrity and availability of global navigation by satellite, along with self-contained consistency checking techniques such as receiver autonomous integrity monitoring. The n... View full abstract»

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  • Technical issues with multichip module packaging

    Publication Year: 1992, Page(s):9/17 - 9/24
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    It is asserted that multichip modules (MCMs) provide a solution to the requirement for cost-effective high-performance packaging in the 1990s, and insight into the selection of an optimum interconnect technology is provided. The different types of interconnect substrates for MCMs are discussed, and it is argued that cofired ceramic and thin-film interconnect substrates are the most suitable ones f... View full abstract»

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  • Classification of multi-look polarimetric SAR data based on complex Wishart distribution

    Publication Year: 1992, Page(s):7/21 - 7/24
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    An optimal feature classification scheme is developed for multilook polarimetric SAR (synthetic aperture radar) imagery based on a multivariate complex Wishart distribution. The purpose is to identify various ground covers, such as forest, vegetation, city block, ocean, and sea ice type. Multilook polarimetric SAR data can be represented either in Stoke's matrix form or in complex covariance matri... View full abstract»

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  • Radio location through high resolution eigenstructure processing techniques that yield accurate multipath AOA and differential time delay estimates

    Publication Year: 1992, Page(s):3/9 - 312
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    An eigenstructure-based, doubly adaptive array processing algorithm is described. This algorithm was designed to resolve the differential time of arrival between a direct signal and a delayed replica that arrives via a different ray path. Simulations, using theoretical responses of a circular eight-element dipole array, demonstrates the characteristics of this doubly adaptive technique. Experiment... View full abstract»

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  • The Three-Dimensional Event-Driven Graphics Environment (3D-EDGE)

    Publication Year: 1992, Page(s):6/1 - 6/5
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Stanford Telecommunications has developed the Three-Dimensional Event-Driven Graphics Environment (3D-EDGE) for the NASA Goddard Space Flight Center's Communications Link Analysis and Simulation System (CLASS). 3D-EDGE consists of a library of object-oriented subroutines, which allows engineers with little or no computer graphics experience to programmatically manipulate, render, animate and acces... View full abstract»

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  • High temperature superconductor packaging technology

    Publication Year: 1992, Page(s):9/25 - 9/28
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The objective of using high-temperature superconductor (HTSC) interconnects in multichip module (MCM) substrates is to increase the functional performance to volume ratio above that of conventional MCMs. Functional performance is increased through the use of superconductive interconnect traces which allow ultra-high-speed transmissions between devices. Determining the exact operational characteris... View full abstract»

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  • Action-oriented sensor fusion for telesystems

    Publication Year: 1992, Page(s):10/11 - 10/14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Work in sensor fusion for fully autonomous mobile robots that is expected to be useful for telesystems is discussed. Emphasis is placed on one product of this work, i.e. the sensor fusion effects (SFX) architecture, which can be extended into a control scheme for sensor fusion in telesystems. It can reduce the teleoperator's time in supervising the execution of a telerobot's sensing strategy and a... View full abstract»

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  • Communications satellite technology and services for the 90's

    Publication Year: 1992, Page(s):8/1 - 8/6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The future of satellite communications is addressed from the viewpoint of both commercial and military users. Technological advances and new services are discussed, and user requirements are assessed. It is pointed out that there are many different technologies that are available for implementation on future satellite systems. It appears that the field of satellite communications will move to serv... View full abstract»

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  • SCADA application for ACTS technology

    Publication Year: 1992, Page(s):8/15 - 8/21
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A satellite and earth terminal systems study was initiated by the NASA Advanced Communication Technology Satellite (ACTS) Project Office and was performed by Hughes Network Systems. The purpose of the study was to investigate the potential of a specialized Ka-band spot beam satellite to reduce the cost of supervisory control and data acquisition (SCADA) communications. The study showed th... View full abstract»

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  • Urban area performance of GPS receiver with simultrac capability

    Publication Year: 1992, Page(s):3/13 - 3/17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The theory of operation, practical applications, and technical performance of a Global Positioning System (GPS) receiver designed for urban area use are explained. Component-level system design choices are shown to support superior automotive vehicle location (AVL) performance, including optimum mobile communications with satellites and ground-based relays. The Humminbird GPS can be viewed as a mo... View full abstract»

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  • Video compression implemented using rigid and non-rigid object recognition and computer graphics animation

    Publication Year: 1992, Page(s):6/7 - 614
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A video compression prototype system is described that significantly reduces the required bandwidth for video transmission by using intelligent terminals. The terminals used for video compression are trained to recognize what they see. Each computer contains a three-dimensional description of objects that might be in the scene. This description includes information about the objects, such as how t... View full abstract»

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  • Automated polarization measurement

    Publication Year: 1992, Page(s):2/13 - 2/15
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The author describes a novel scheme of polarization measurement utilizing more than four antennas or photodetectors. In particular, he seeks configurations which possess the attractive features of conceptual and computational simplicity, robustness, and self-checking redundancy. Using a computationally convenient algorithm based on a six-port theory, digitized power meter indications are readily p... View full abstract»

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  • A practical implementation of a hierarchical control system for telerobotic land vehicles

    Publication Year: 1992, Page(s):10/1 - 10/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The author presents a practical hierarchical control system for telerobotic land vehicles. The goal of the architecture is to enable the user to have a relatively inexpensive control system that can be easily upgraded as the application demands. This is accomplished by having low-level modules that provide interfaces to hardware and the external environment and communicate with higher levels throu... View full abstract»

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  • A teleoperated unmanned rotorcraft flight test technique

    Publication Year: 1992, Page(s):10/15 - 10/20
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    NASA and the US Army are jointly developing a teleoperated unmanned rotorcraft research platform at the National Aeronautics and Space Administration (NASA) Langley Research Center. This effort is intended to provide the rotorcraft research community an intermediate step between wind tunnel rotorcraft studies and full-scale flight testing. The research vehicle is scaled such that it can be operate... View full abstract»

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  • Low-Earth-orbit store-and-forward satellites in the amateur radio service

    Publication Year: 1992, Page(s):8/7 - 814
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The authors review the current state of the art in amateur radio store-and forward satellite communications. Several operating satellite systems are described along with the procedures, equipment, and software required to access them. For PACSAT-1 empirical data have been used to estimate a downlink bit error probability of 6.0E-5. A further description of downlink performance is given through the... View full abstract»

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  • Improved radar detection using adaptive multiband polarization processing

    Publication Year: 1992, Page(s):1/7 - 111
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    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... View full abstract»

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  • Telerobotic testing of autonomous air vehicles

    Publication Year: 1992, Page(s):10/23 - 10/26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    It is noted that the testing of fully autonomous air vehicles usually begins under the control of an expert teleoperator. Design and testing progress by transferring control from the expert to the onboard intelligence which will ultimately provide self-governing control for the air vehicle. The transfer process is best performed when ever-increasing authority is granted to the onboard intelligence... View full abstract»

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  • A single-chip deinterleaving Reed-Solomon decoder for high performance CCSDS telemetry

    Publication Year: 1992, Page(s):12/19 - 12/21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The authors describe the development of a single-chip deinterleaving Reed-Solomon error correction decoder that demonstrates low-cost error correction for CCSDS (Consultative Committee for Space Data Systems) compatible data streams. This Reed-Solomon error correction chip, designed to operate at rates up to 300 Mb/s, also incorporates additional on-chip features such as cumulative quality account... View full abstract»

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  • Low-cost TDRSS communications for NASA's Long Duration Balloon Project

    Publication Year: 1992, Page(s):8/23 - 8/27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A new low-cost non-space-qualified TDRSS user S-band transponder and RF ground support equipment have brought tracking and data relay satellite system (TDRSS) capabilities to a class of users who seek enhanced operations for low budget scientific investigations. The Goddard Space Flight Center (GSFC)/Wallops Flight Facility's Long Duration Balloon Project (LDBP) will take advantage of the... View full abstract»

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  • Target material characterization using high-order signal processing of ultra-wideband radar data

    Publication Year: 1992, Page(s):1/17 - 1/24
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Results obtained by two high-order signal processing methods applied to ultrawideband (UWB) radar data in the UHF band are described. The UWB radar data were collected in a specially designed bistatic test range. Four types of UWB signals were used to test a metal (reference) plate, five different commercially available radar absorbing material samples with metal backing, and five natural material... View full abstract»

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  • Advanced silicon-on-silicon VLSI multichip packaging

    Publication Year: 1992, Page(s):11/5 - 11/6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    A multichip module (MCM) packaging technology was developed for commercial and military applications based on the VLSI chips on silicon (VCOS) technology. This VCOS technology is extremely well suited for low-power, high-density CMOS applications where low cost and fast design cycles are critical. With the use of IBM's controlled collapse chip connection (C4), this technology can basically brick-w... View full abstract»

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  • GPS-based precise tracking of Earth satellites from very low to geosynchronous orbits

    Publication Year: 1992, Page(s):4/1 - 4/8
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Various GPS (Global Positioning System)-based tracking strategies for Earth orbiting satellites are reviewed. Three different categories of user satellites are studied: low circular orbits with altitudes between a few hundred and a few thousand kilometers, highly elliptical orbits with perigees as low as a few hundred and apogees as high as tens of thousands of kilometers, and high circular orbits... View full abstract»

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  • Compression standards and alternative methods for video telecom

    Publication Year: 1992, Page(s):6/15 - 6/20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The complex video compression methods now in the process of being standardized are designed to reduce transmission needs by detecting and coding image redundancy temporally and spatially between frames. New methods under investigation involving fractals and wavelets may achieve more efficient coding by defining spatial formats and equations more applicable to the specific image than the more gener... View full abstract»

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