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Aerospace and Electronic Systems Magazine, IEEE

Issue 1 • Date Jan. 2002

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Displaying Results 1 - 6 of 6
  • Chinese International Radar Conference 2001 (CIRC '01)

    Publication Year: 2002 , Page(s): 31 - 33
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    Freely Available from IEEE
  • UWB radars in medicine

    Publication Year: 2002 , Page(s): 13 - 18
    Cited by:  Papers (142)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (625 KB)  

    Applied research on biomedical applications of UWB radar is targeted to the identification of the possible new devices made possible by the technology, to the design and development of those devices, and to the clinical testing of the systems obtained. Applications can be divided into two main sectors according to the frequency range used. For the conventional UWB radar microwave region: cardiac biomechanics assessment; chest movements assessment OSA (obstructive sleep apnoea) monitors; soft-tissue biomechanics research; heart imaging ("Holter type" echocardiography); chest imaging. Together with systems for: cardiac monitoring; respiratory monitoring; SIDS (sudden infant death syndrome) monitor; vocal tract studying. If an IR laser diode is used as the antenna, a more common radar is obtained (actually a hybrid between a narrow band and a wide band radar) which emits a short packet of electromagnetic waves whose echoes are sampled using conventional UWB receiver equipped with a PIN photodiode. Possibilities include: non-invasive biochemical study of soft tissues, non-invasive study of metabolic processes, and IR spectral imaging View full abstract»

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  • Hydrogen-fueled pollution-free transportation

    Publication Year: 2002 , Page(s): 34 - 40
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    Hydrogen has been a useful fuel in manned spacecraft, where the only exhaust from the electric power generating fuel cells is useful water. The cost of producing and delivering the hydrogen, though high, was trivial compared to its value in the missions. We have a new problem in our Earth's atmosphere - its growing content of carbon dioxide, 47% of which comes from transportation-vehicle exhausts. Replacing all of the petroleum-fueled transportation with hydrogen-fueled transportation would reduce the carbon dioxide air pollution from transportation to zero. The cost of producing hydrogen during the night by electrolysing water with power from nuclear power plants would be trivial. However, there are added costs in hauling hydrogen in tank trucks to filling stations and carrying hydrogen fuel in cars View full abstract»

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  • National missile defense (NMD)

    Publication Year: 2002 , Page(s): 4 - 12
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    President Bush has declared his desire for early deployment of a US National Missile Defense or NMD system to protect the nation against an attack of one or a dozen ICBMs carrying nuclear or, possibly, other weapons of mass destruction (WMDs). He has the support of the Secretary of Defense, sizeable groups in Congress and the public who feel strongly that the US should have a means to provide protection against that threat, and the US has the technology to create that means. The author presents an overview of the perceived need for deploying such an NMD system which would entail the scrapping of existing ABM treaties View full abstract»

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  • Software architecture for building

    Publication Year: 2002 , Page(s): 27 - 30
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    Test system developers can benefit greatly from a software architecture that allows for easy interchangeability of instruments in those systems. Using open industry standard software architectures such as Virtual Instrument Software Architecture (VISA), and Interchangeable Virtual Instruments (IVI), developers are able to create systems with interchangeable test instrumentation. This paper describes the VISA and IVI software standards and demonstrates how their use within a broader software architecture, which includes standard development environments and flexible test executive software, facilitates the creation of interchangeable test systems View full abstract»

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  • Modern microwave power sources

    Publication Year: 2002 , Page(s): 19 - 26
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1061 KB)  

    The primary advantages of electron tubes over solid-state devices are that they are usually more efficient and will operate at higher temperature. Therefore, they can be smaller, tighter and still dissipate the waste heat that, unavoidably, goes along with the production of high output power. It is no accident that a one-megawatt cw microwave tube (1340 horsepower) is about the same size as a 1250 horsepower internal combustion engine. An assemblage of transistors or integrated circuits would be a much larger maze of circuit boards, power busses, cables, combiners, fuses, heat sinks, and, probably, water pipes. Unlike the situation that pertains for signal and data processing in which Moore's law applies, and complexity and performance increase while size and cost decrease in secular fashion, the transmitter built one hundred years from now will be no smaller and no lighter than the one you build today, unless the active elements are more efficient or run hotter than present-day microwave tubes. At ultra-high frequencies and above, solid-state technology has little hope of providing either advantage. The laws of thermodynamics are not man-made and cannot be broken. Many signals, including both analog and digital TV, digital communications, and EW, have high ratios of peak to average power. The poor efficiency of some microwave solid-state devices in class-A or class-AB operation when compared to that of class-AB gridded electron tubes and TWTs with multistage depressed collectors has interfered with their acceptance as amplifiers of such signals in both commercial and military service at UHF and higher frequencies. In this paper, new data on the new kinds of microwave tubes will be presented with emphasis on their suitability for application in economical, high-reliability, high-performance satellites, and communications, electronic warfare, and radar systems 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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Teresa Pace, PhD EE
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