1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403)

7-7 March 1999

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  • 1999 IEEE Aerospace Conference Proceedings

    Publication Year: 1999, Page(s):0_2 - xiii
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    Freely Available from IEEE
  • GRS: a dynamic GBS downlink beam scheduling tool

    Publication Year: 1999, Page(s):3 - 13 vol.5
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    A preliminary apportionment plan governing the allocation of Global Broadcast Service (GBS) spot beams among users was proposed in May 1997. A tool known as the GBS Resource Scheduler (GRS) has been developed to analyze the behavior of a single agile spot beam downlink. The downlink serves multiple destinations that are too far apart from one another to be covered by a single footprint. These resu... View full abstract»

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  • Imaging infrared seeker modeling in a Khoros environment

    Publication Year: 1999, Page(s):15 - 21 vol.5
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1452 KB)

    The design implementation of imaging infrared (IR) seekers for anti-aircraft missiles is highly volatile, as sensor and signal processing configurations can be readily modified, sometimes (in the case of signal processing algorithms) in near real time. Hence, one should be able to model the behavior of imaging seekers in an environment where parameters can be easily changed by the user to reflect ... View full abstract»

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  • Impact of baseband filtering on the SGLS waveform

    Publication Year: 1999, Page(s):23 - 28 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    This paper investigates the effects of the baseband filtering on the data performance of the Space-Ground Link Subsystem (SGLS) uplink. The uplink SGLS waveform investigated in this paper includes data, command, and ranging signals. The performance of the data channel will be evaluated analytically for ideal conditions, namely, perfect carrier/sub-carrier tracking, frequency synchronization, timin... View full abstract»

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  • The global positioning system interference and navigation tool (GIANT)

    Publication Year: 1999, Page(s):29 - 38 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (726 KB)

    The Global Positioning System (GPS) is a spaced-based radionavigation system that provides accurate, continuous, worldwide service to passive users. GIANT is a one GPS-equipped platform versus many interference sources, constructive and repeatable simulation used to determine navigation performance and operational effectiveness. GIANT is PC-based, is Government-Owned, includes a user-friendly grap... View full abstract»

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  • An evaluation of message passing implementations on Beowulf workstations

    Publication Year: 1999, Page(s):41 - 54 vol.5
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Beowulf workstations have become a popular choice for high-end computing in a number of application domains. One of the key building blocks of parallel applications on Beowulf workstations is a message passing library. While there are message passing library implementations available for use on Beowulf workstations, as of yet none have been specifically tailored to this new, unique architecture. T... View full abstract»

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  • Phase tracking by fuzzy control loop

    Publication Year: 1999, Page(s):57 - 66 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    Fuzzy control, a control mechanism making use of fuzzy logic is implemented here for controlling a discrete phase locked loop (DPLL), and evaluating its performance by comparing the transient response with that of a similar uncontrolled DPLL. Even though other papers in the subject have been published, such as the one by D. Simon and H. El-Sherief (1995), this tutorial paper describes the essentia... View full abstract»

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  • Code decay analysis of legacy software through successive releases

    Publication Year: 1999, Page(s):69 - 81 vol.5
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (985 KB)

    Prediction of problematic software components is an important activity today for many organizations as they manage their legacy systems and the maintenance problems they cause. This means that there is a need for methods and models to identify troublesome components. We apply a model for classification of software components as green, yellow and red according to the number of times they required c... View full abstract»

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  • Trade-offs in planner representation for automated software testing

    Publication Year: 1999, Page(s):83 - 92 vol.5
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (695 KB)

    This paper explores an alternative approach to automated test generation based on Al technology: planner based test generation. In planner based test generation, test cases are generated from a domain theory (model of the system being tested), and a description of the initial and desired (goal) state(s) of the system. We identify three key issues and trade-offs in the process of developing a plann... View full abstract»

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  • On the efficiency of a compound Poisson stopping rule for mixed strategy testing

    Publication Year: 1999, Page(s):93 - 98 vol.5
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB)

    When testing software, testers rarely use only one technique to generate tests that, they hope, will fulfill their testing criteria. Malaiya showed that testers switch strategies when testing yield saturates. We present and evaluate a stopping rule that can be used to determine when it is time to switch to a different testing technique, because the current one is not likely to increase criteria fu... View full abstract»

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  • Reasoning about actions for spacecraft redundancy management

    Publication Year: 1999, Page(s):101 - 112 vol.5
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (778 KB)

    We present an application of action description languages to spacecraft operational redundancy management problems. In these problems we concern ourselves with the identification and execution of operator actions that - in response to some loss of spacecraft functionality-regain equivalent functionality or reduce exposure to subsequent faults. Action languages allow one to represent such actions a... View full abstract»

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  • Proactive network design

    Publication Year: 1999, Page(s):113 - 130 vol.5
    Cited by:  Papers (3)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1221 KB)

    This paper describes a process for establishing an optimal network design. High-level system requirements specified by a customer are used to derive performance requirements that bound the network parameters. A deterministic static model is used to derive the bandwidth requirements, e.g., identify performance requirements to address the worst-case conditions. The static model is composed of inter-... View full abstract»

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  • Integrated design and optimization of microelectronic devices

    Publication Year: 1999, Page(s):131 - 138 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A genetic algorithm is used for design of infrared filters and in the understanding of the material structure of a resonant tunneling diode. These two components are examples of microdevices and nanodevices that can be numerically simulated using fundamental mathematical and physical models. Because the number of parameters that can be used in the design of one of these devices is large, and becau... View full abstract»

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  • Software fault tolerance in a clustered architecture: techniques and reliability modeling

    Publication Year: 1999, Page(s):141 - 150 vol.5
    Cited by:  Papers (17)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (675 KB)

    System architectures based on a cluster of computers have gained substantial attention recently. In a clustered system, complex software-intensive applications can be built with commercial hardware, operating systems, and application software to achieve high system availability and data integrity, while performance and cost penalties are greatly reduced by the use of separate error detection hardw... View full abstract»

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  • The implementation and validation of the new standard CCSDS file delivery protocol for multi-hopped space file transfer

    Publication Year: 1999, Page(s):153 - 163 vol.5
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (993 KB)

    Consultative Committee for Space Data Systems (CCSDS) is an international standardisation organisation for space data systems. It has been developing standard recommendations for the space communication networks. CCSDS is about to propose a new file transfer protocol for use both in space and ground based networks, named CCSDS File Delivery Protocol (CFDP). The main objective of CFDP is to overcom... View full abstract»

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  • Run-time satellite tele-communications call handling as dynamic constraint satisfaction

    Publication Year: 1999, Page(s):165 - 174 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (817 KB)

    The next generation of communications satellites may be designed as a fast packet-switched constellation of spacecraft able to withstand substantial bandwidth capacity fluctuations due to causes ranging from unstable weather phenomena to intentional jamming. Scheduling and servicing call requests in such a dynamic environment requires real-time decisions with regard to allocation of resources incl... View full abstract»

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  • Quadrature product subcarrier modulation (QPSM)

    Publication Year: 1999, Page(s):175 - 182 vol.5
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (442 KB)

    Due to the limited availability of spectrum allocations for communications systems, it has become desirable to reuse existing spectrum by employing bandwidth efficient modulation methods to existing satellite communications systems. As the number of users of a given communication system increases, it often becomes necessary to augment the system with additional communication signals. One method th... View full abstract»

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  • Space link simulator for development of a new standard CCSDS file delivery protocol

    Publication Year: 1999, Page(s):183 - 191 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Terrestrial network based file transfer protocol is known to be unacceptable for the space network environment. The Consultative Committee for Space Data Systems (CCSDS) is about to propose a new file transfer protocol for use in both space and ground based networks, named CCSDS File Delivery Protocol (CFDP). CFDP is based on packet oriented protocols as its underlaying network layer. The supporte... View full abstract»

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  • Measuring phase noise at K-hand

    Publication Year: 1999, Page(s):193 - 209 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    This paper investigates the applicability of common methods of phase noise measurement and short-term frequency stability measurement to K-band frequencies. A phase-noise testset was designed and implemented to test a unit with a nominal frequency of 17.86 GHz, a nominal integrated phase noise of 3/spl deg/ rms, and a nominal carrier-to-equivalent-noise-spectral-density of 110 dB-Hz. The object wa... View full abstract»

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  • An introduction of EMI/EMC test requirements for space application

    Publication Year: 1999, Page(s):213 - 221 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB)

    System and unit designers should be aware that unique tests and considerations are required for the space qualification of any electronic unit. These invariably include a group of tests that are called electromagnetic interference (EMI) and electromagnetic compatibility (EMC) tests. The EMI/EMC qualification test phase is usually performed on an engineering model and for the first flight unit. An ... View full abstract»

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  • Developing safety cases for integrated flight systems

    Publication Year: 1999, Page(s):225 - 240 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (994 KB)

    The successful application of integrated systems into the safety critical domain requires careful management and a realistic approach to planning the introduction of such systems. One such approach is through work on technology demonstration programs. British Aerospace and the UK Ministry of Defence have embarked on such a project, considering the integration of several flight critical application... View full abstract»

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  • Design and performance testing of a satellite health beacon receiving station

    Publication Year: 1999, Page(s):241 - 251 vol.5
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (837 KB)

    As part of its space operations research program, Stanford University's Space Systems Development Laboratory (SSDL) is implementing an automated state of health assessment and notification system for spacecraft. Onboard the spacecraft, this system consists of software that filters telemetry to derive a health assessment and a periodic beacon that broadcasts this assessment to the ground. Throughou... View full abstract»

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  • Integrating digital stereo cameras with Mars Pathfinder technology for 3D regional mapping underwater

    Publication Year: 1999, Page(s):253 - 259 vol.5
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (567 KB)

    In August 1998, Santa Clara University students joined NASA and NOAA researchers in an archeological expedition to the Arctic Ocean. Titled "The Jeremy Project" after one of the student researchers, the major technology goal of this voyage was to test the Mars Pathfinder's three-dimensional mapping technology, developed by the NASA Ames Intelligent Mechanisms Group, on an underwater remotely opera... View full abstract»

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  • Comparison of probability of non-visibility in case of faults of some satellites in LEO constellations

    Publication Year: 1999, Page(s):263 - 270 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    In this paper we analyze the coverage performance of satellite constellation in low earth orbit. First we analyze the various possible configurations of satellite failures in the same orbital plane or in different orbital planes when one satellite or a number of satellites are at fault. To evaluate the performance of each constellation we use one parameter, which is the maximum non-visibility time... View full abstract»

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  • Wargame 2000 verification, validation and accreditation

    Publication Year: 1999, Page(s):271 - 283 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1427 KB)

    The verification, validation and accreditation (VV&A) approach for wargames that use the Wargame 2000 System is based on the Defense Modeling and Simulation Office (DMSO) VV&A Recommended Practices Guide (RPG). It builds on information collected during the system development and qualification, supplemented where required, to create the accreditation package for each wargame. This paper rev... View full abstract»

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