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Aerospace and Electronic Systems Magazine, IEEE

Issue 3 • Date Mar 1995

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Displaying Results 1 - 7 of 7
  • Space power for an expanded vision

    Publication Year: 1995 , Page(s): 3 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    The author suggests that the problem with the space program in the 1990s is that there are few short term benefits that the public can directly relate to and no long term vision that will motivate them. Recent surveys have shown that public would support an expanded space program if they understood the specific short term purpose that provides benefits coupled to a longer term vision. The author discusses a proposed space program that has a 100 Year Vision and a specific beneficial near term purpose. The specific near term purpose is to return to the Moon and develop He for nuclear fusion power on Earth, and then expand into the Solar System and eventually to the nearby stars with the purpose of finding new life as a long term vision. This is how the author sees it unfolding-in three Epochs. Epoch I is proposed as the minimum near term space program. Space Station Freedom in near-Earth orbit being serviced by the Space Shuttle, the National Aerospace Plane and the Single-Stage-To-Orbit Vehicle. Just above Freedom is an Earth Observing System Satellite that, as part of Mission to Planet Earth, will monitor and analyze our planet's ecological systems. There are also a great many scientific, defense and launch systems whose technologies will evolve to play critical roles in future epochs View full abstract»

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  • Image quality issues for an enhanced vision head up display

    Publication Year: 1995 , Page(s): 40 - 44
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    A part task simulation study was performed to determine the ability of pilots to land an aircraft using head up display (HUD) guidance symbology overlaying an emulated millimeter wave imagery. The task was to land in Category IIIa weather at a Category I facility. Three image parameters were varied: image update rate, image processing latency, and the luminance contrast ratio of the runway image to the background noise. ILS beam bending that was representative of a Category I facility was randomly varied across the experimental runs. Nine pilots completed the test matrix. The only variable that made a significant difference was the runway to background contrast ratio View full abstract»

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  • Aircraft traffic management on the airport surface using VHF data link for CNS

    Publication Year: 1995 , Page(s): 9 - 13
    Cited by:  Patents (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Aircraft traffic management on the airport surface will require the effective utilization of communications, navigation and surveillance (CNS). This paper describes an experiment which provides a glimpse of future automation. The experiment combines precision surface radar, high-accuracy differential GPS (DGPS) position determination, automatic dependent surveillance (ADS), and ground and airborne automation systems able to intercommunicate via a VHF data link. In particular, this paper describes the air/ground communications provided by the VHF Data Link. Two classes of messages are processed: continual and ad hoc. The former include DGPS corrections, ADS messages and target data. The latter include graphical taxi clearances and hold bar set-reset information. The work described in this paper is the result of a cooperative venture among NASA, Westinghouse-Norden Systems and ARINC View full abstract»

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  • C-17 successful application of existing automatic test equipment

    Publication Year: 1995 , Page(s): 29 - 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    The C-17 Program utilizes existing B-1B Automatic Test Equipment (ATE). The C-17 decision is in harmony with the Air Force emphasis on reducing proliferation of unique ATE. The ATE selection was made after consideration of cost, performance and supportability tradeoffs. Minimal augmentation of the government inventoried equipment was required which did not affect the existing hardware and software configuration, This approach significantly reduced C-17 program ATE development costs and afforded the program the use of established logistics elements and support structure. The C-17 program demanded concurrency of support structure and aircraft development-the ATE solution met that demand by reducing risks to a manageable level for both test program set development, and Air Force operation and training requirements View full abstract»

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  • Hybrid connectionist systems in research and teaching

    Publication Year: 1995 , Page(s): 14 - 18
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    There is a tremendous world-wide interest in the development of the theory and application of artificial intelligence (AI) and related techniques both in tertiary institutions and in industry. This paper presents a brief survey of overseas AI teaching programs together with a review of the teaching program in the University of South Australia. In addition, post-graduate projects undertaken by the Knowledge-Engineering Systems Group (KES), and sponsored by the Defence, Science and Technology Organisation (DSTO), are discussed. These involve expert systems, neural networks, fuzzy logic and genetic algorithms. It is shown by using a classical exclusive-OR problem that it is useful to use hybrid techniques which offer fast convergence in optimization problems. Although much of this work is still at an early stage, sufficient progress has been made to demonstrate the merit of using AI and related techniques to help create solutions to these problems View full abstract»

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  • VLSTA: virtual instrument standard test architecture

    Publication Year: 1995 , Page(s): 19 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (872 KB)  

    Diagrammatic programming environments provide a unique challenge for the developers of test software. These cost effective environments facilitate access to technologies such as VXI, provide speedy development of highly effective user interfaces, and eliminate many of the tasks often associated with hardware integration in complex test systems. Nonetheless, difficulties can arise when designing functional and diagnostic test software in this environment. This paper introduces VISTA, a promising new architecture which allows users to elude most of the difficulties of building detailed functional and diagnostic Test Program Sets (TPSs), while taking full advantage of the benefits of diagrammatic programming environments. Here we examine an implementation of the VISTA architecture, the integration of advanced diagnostics, and the use of diagrammatic programming as a test language cross compiler View full abstract»

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  • Single measurement testing, pros and cons

    Publication Year: 1995 , Page(s): 35 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    There is a school of thought that believes making a single measurement of some parameter is a proper test procedure. For reasons of speed and the large number of measurements to be made on an item, so the reasoning goes, one cannot afford to make multiple measurements, calculate the average and the variation of the readings. What are the consequences of this approach? Can one test a unit to its specifications using this approach? What are the trade-offs inherent in single measurement testing? What happens if an erratic unit is tested? An alternative testing method involves taking a few repeat values, averaging them and estimating their repeatability. The same set of questions apply. The pros and cons of these two approaches will be discussed. Practical real world examples will be presented View full abstract»

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The IEEE Aerospace and Electronic Systems Magazine publishes articles and tutorials concerned with the various aspects of systems for space, air, ocean, or ground environments.

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