Conference Proceedings National Telesystems Conference 1993

16-17 June 1993

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Displaying Results 1 - 25 of 45
  • The RADARSAT remote sensing ground station for McMurdo station, Antarctica

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given. Under a memorandum of agreement with the Canadian Space Agency and NOAA, NASA has agreed to construct a remote sensing station and deploy it at McMurdo Base in Antarctica. The station is designed to receive the downlinked data from RADARSAT and to provide for future remote sensing applications on the Antarctica continent. The system, which was designed to meet the special ... View full abstract»

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  • A large W-band slotted waveguide array

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Summary form only given. Slotted arrays at millimeter-wave frequencies play an important role in commercial applications such as collision radars and synthetic vision systems. The authors describe the design, fabrication and testing of a 3-ft-long slotted waveguide array having 600 edge wall slots. The design represents a low-loss technique for achieving a high-resolution pattern and uses a standa... View full abstract»

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  • A GPS solution to precision approach and landing (even in the presence of anti-spoofing)

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. The ability to track quality dual-frequency P-code (code and phase) observables has been responsible for many exciting developments in global positioning system (GPS) geodesy and precision navigation. However, civilian users were confronted with the fact that P-code quality tracking will essentially disappear when the government enacts full time anti-spoofing (AS). A propr... View full abstract»

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  • INTELSAT VIII; INTELSAT's next generation satellite

    Publication Year: 1993
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    Summary form only given. The authors present a general overview of the design and key features of Intelsat's next-generation satellite, INTELSAT VIII. INTELSAT VIII will provide both C-band and Ku-band services through a complex antenna system. The 3700-kg spacecraft is based on the GE Series 7000 platform currently in production and is expected to provide over 13 years of in-orbit operational ser... View full abstract»

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  • Prospects for international TVRO growth

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Summary form only given, as follows. With the introduction at the end of 1993 of the high EIRP INTELSAT VII/VIII-A satellites, the INTELSAT network is about to enter a new phase of dramatically increased capability. Voice, data and video services will become practical on global scale to much smaller ground terminals than ever before. A similar situation occurred in the United States in the late 19... View full abstract»

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  • Externally modulated optical analog links for microwave applications

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given, as follows. Fiber-optic analog links using external modulators are useful for microwave applications. They can transmit microwave signals over distances up to several kilometers with low loss and negligible dispersion. With the addition of a few more components, these links can be used in phased array antennas to steer the beam and to provide broadband adaptive nulling. Th... View full abstract»

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  • Proceedings of 1993 IEEE National Telesystems Conference

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (96 KB)
    Freely Available from IEEE
  • Receiver frequency resolution for range resolution in homodyne FMCW radar

    Publication Year: 1993, Page(s):169 - 173
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The author presents an analysis and simulation results relating the range resolution to the receiver frequency resolution in a linear frequency modulated, continuous wave, (FMCW) homodyne radar. He considers the relationship between range resolution and receiver frequency resolution for systems that use the fast Fourier transform (FFT) to form multiple frequency and range bins. A millimeter wave (... View full abstract»

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  • Evaluation of candidate millimeter wave radars for synthetic vision

    Publication Year: 1993, Page(s):83 - 89
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    In 1988 the US Federal Aviation Administration, in cooperation with industry, the US Air Force, the US Navy, and several other government organizations, initiated an effort to demonstrate the capabilities of existing technologies to provide an image of the runway and surrounding environment for pilots operating aircraft in low-visibility conditions. This effort was named the synthetic vision techn... View full abstract»

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  • High resolution MMW seeker fuse processing

    Publication Year: 1993, Page(s):175 - 179
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors describe a new signal processing technique for phased arrays that can be used in near-field target imaging. This processing technique is useful to millimeter wave seekers employing planar phased arrays as a new approach to performing warhead fusing. The array operation and signal processing are similar to synthetic sampled aperture radar (SSAMAR). Through a coherent integration of all ... View full abstract»

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  • The ARINC veracious differential reference station concept and status

    Publication Year: 1993, Page(s):143 - 152
    Cited by:  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    An important aspect that must be considered in the design of any differential global positioning system (DGPS) is the degree of integrity inherent in the differential corrections provided by that system. Currently available DPGS systems provide only partial integrity due to one or more of the following reasons: they are restricted to single operating mode integrity, they are capable of failure det... View full abstract»

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  • Transportable orbital tracking, telemetry and command system

    Publication Year: 1993, Page(s):241 - 249
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    NASA/Goddard Space Flight Center has implemented an automated ground-based telemetry, command, and Doppler system. Its function is to support the low-earth-orbiting satellite and sounding rocket programs. This fully transportable system can be configured with the capability to provide unmanned satellite support for seven days or operator augmented automated sounding rocket launch and tracking supp... View full abstract»

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  • Synthetic vision/enhanced vision system implementation

    Publication Year: 1993, Page(s):91 - 95
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    There is an emerging requirement within the world's air transport network to improve safety and increase productivity by enabling aircraft to perform visual flight operations under low-visibility weather conditions. Currently, the commercial aviation industry has centered its efforts at achieving this requirement around a millimeter-wave imaging radar and/or imaging infrared (IR) sensor, a Global ... View full abstract»

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  • Application of aerostat radars to drug interdiction

    Publication Year: 1993, Page(s):181 - 183
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The application of aerostat radars for the purpose of detecting and tracking low flying aircraft and small ships used for drug smuggling is an example of an application of technology to nonmilitary purposes. Sophisticated coherent radars that include moving target indication (MTI) and pulse compression processing to achieve the target extraction from clutter have been adapted from military coheren... View full abstract»

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  • A versatile, broadband, low-profile antenna

    Publication Year: 1993, Page(s):227 - 231
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The recently invented spiral-mode microstrip (SMM) antenna is finding application in various commercial systems as well as various military systems in addition to the military application for which it was developed. The salient features of this antenna are reviewed with respect to those applications for which interest in the antenna has been strongest. The salient features of the new antenna are b... View full abstract»

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  • Optical beam forming and steering for phased-array antenna

    Publication Year: 1993, Page(s):7 - 12
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Application of photonics in beam forming and steering for phased-array antennas is addressed in this paper. The feasibility of photonics in space communications systems centers around the basic issues such as the need for photonics and derived benefits, overall performance, and complexity and cost of implementation. Several optical beam forming and steering payloads are assessed for their capabili... View full abstract»

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  • A 45-Mbits/sec. VLSI Viterbi decoder for digital video applications

    Publication Year: 1993, Page(s):127 - 130
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The author describes the unique architecture and feature set incorporated into the STEL-2060 Viterbi Decoder, a VLSI device designed by Standford Telecom. This device was designed primarily for direct broadcasting by satellite (DBS) services and operates up to 45 Mb/s. The STEL-2060 uses industry standard, constraint length 7, polynomials and incorporates depuncturing circuitry to allow it to be u... View full abstract»

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  • Multiwavelength photonic communications

    Publication Year: 1993, Page(s):15 - 20
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The integration of multiwavelength technology into practical fiber optic communication systems is gradually becoming a reality because the required important wavelength tunable components are readily available. The author reviews several important multiwavelength system applications and briefly describes the key components, both commercially available and the state-of-the-art, for those systems. T... View full abstract»

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  • MMW technology for enhanced situation awareness/enhanced vision systems

    Publication Year: 1993, Page(s):97 - 99
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Millimeter wave (MMW) radar systems are now demonstrating the ability to image airport environments in fog. The authors discuss the use of MMW radar technology to provide pilots with enhanced vision and enhanced situation awareness. One of the first steps in providing an autonomous aircraft is the Enhanced Vision System (EVS). This system consists of a heads-up display (HUD) and an imaging MMW rad... View full abstract»

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  • Pseudo windowing for synthetic sampled aperture radar target detection

    Publication Year: 1993, Page(s):185 - 189
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors introduce a significant modification to the coherent integration algorithm of synthetic sampled aperture radar (SSAMAR) processing to achieve Hamming-like or cosine to the fourth-like tapering. Only pseudo Hamming or cosine to the fourth tapering is possible because the coefficients of the coherently integrated SSAMAR returns are integers. In other words, the coefficients of the return... View full abstract»

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  • ATMS 2000: hybrid automation or a lights out traffic management center?

    Publication Year: 1993, Page(s):37 - 42
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Because of rapid advances in information and automation technology, traffic management center (TMC) design is in a period of rapid evolution. Larger numbers of more capable traffic and environmental sensors are being fielded. Data fusion and information processing equipment are beginning to exploit this new quantity and quality of information. Automation of routine tasks may help to moderate peaks... View full abstract»

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  • GPS relative navigation for automatic spacecraft rendezvous and capture

    Publication Year: 1993, Page(s):155 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    NASA, in collaboration with the European Space Agency (ESA), is planning a space experiment involving the space shuttle and two spacecraft in low Earth orbit to demonstrate autonomous rendezvous and capture (AR&C). The results of the preliminary design of a global positioning system (GPS)-based relative navigation filter for AR&C are presented. The domain of operation of the GPS relative n... View full abstract»

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  • FLAPS reflector antennas

    Publication Year: 1993, Page(s):233 - 238
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    A flat parabolic surface (FLAPS) reflector is a thin (planar or conformal) surface consisting of an array of elements, each functioning as a radiator and phase shifter. Unlike a conventional planar array, however, the elements on the FLAPS surface are spatially fed using a feed assembly, as in a conventional reflector system. This results in an antenna technology that offers the advantages of both... View full abstract»

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  • Fully remote controlled telemetry tracking antenna system

    Publication Year: 1993, Page(s):253 - 262
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The authors describe a high-performance telemetry receiving antenna tracking system which utilizes unique software to allow full remote control of the tracking antenna, two telemetry receivers, and a diversity combiner. Features include a modular pedestal design, electronically scanned tracking feed (ESCAN), mouse-driven software which uses full-screen representations of selected components, and a... View full abstract»

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  • Applications of the global positioning system to intelligent vehicle highway systems

    Publication Year: 1993, Page(s):139 - 141
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The Intelligent Vehicle Highway System (IVHS) program is aimed at reducing traffic congestion and motor vehicle emissions, and at improving highway safety, by applying advanced communications and computer technologies. The author examines the user requirements and system functions contemplated for IVHS, and discusses the surveillance and navigation services that are required to support them. Compa... View full abstract»

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