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Electronics & Communication Engineering Journal

Issue 3 • June 1992

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Displaying Results 1 - 7 of 7
  • High-performance detector read-out at very low temperatures

    Publication Year: 1992, Page(s):103 - 106
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (309 KB)

    An infra-red detection system must be physically colder than the objects it needs to observe. As some of the objects to be observed by the European Space Agency's Infra-red Space Observatory (ISO) might be as cold as a few tens of degrees Kelvin, it is essential that the ISO's detectors should themselves operate at temperatures close to absolute zero. To avoid problems with electromagnetic interfe... View full abstract»

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  • Digital signal processing in communications satellite payloads

    Publication Year: 1992, Page(s):107 - 114
    Cited by:  Papers (4)  |  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (774 KB)

    Satellite on-board digital signal processing (DSP) offers the potential for significantly improved performance in certain satellite communications system scenarios in terms of system capacity and link quality. On-board DSP functions include digital beamforming, frequency multiplexing and demultiplexing, interference suppression, signal level control and, in a regenerative system, modems. The autho... View full abstract»

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  • On-board processing for anti-jam packet data satcom services

    Publication Year: 1992, Page(s):115 - 122
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (853 KB)

    Future military satellites may take advantage of developments in space components to provide on-board processing within the communications payload. They will also need to support military packet communications networks. The author presents some of the criteria which will affect the performance of a satellite supporting an antijam packet data service. The architecture of the communication protocols... View full abstract»

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  • Microwave IC control components for phased-array antennas

    Publication Year: 1992, Page(s):123 - 130
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (934 KB)

    The next generation of communications satellites will use steerable phased-array antennas to allow in-flight alterations to the antenna beam shapes. The beam-forming networks of these antennas require digitally switchable attenuation-free phase shifters and phase-free attenuators. These control components must operate typically over 8% bandwidths at X- and Ku-bands with switching accuracies of 5 d... View full abstract»

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  • Technologies for miniaturisation of advanced spaceborne payloads

    Publication Year: 1992, Page(s):131 - 139
    Cited by:  Papers (1)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (646 KB)

    The Advanced Synthetic Aperture Radar (ASAR) is one of the instruments proposed by the European Space Agency (ESA) for use on the Polar Platform POEM-1. This phased-array radar comprises 320 transmit/receive (T/R) modules and therefore represents a high volume requirement for spaceborne applications. Each T/R module is required to meet stringent specifications in terms of size, mass, power consump... View full abstract»

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  • UoSAT microsatellite missions

    Publication Year: 1992, Page(s):141 - 150
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (976 KB)

    Advances in VLSI microelectronics have catalysed a new species of small, low-cost yet sophisticated and highly capable 'microsatellites' that can be launched inexpensively as auxiliary payloads complementing, or sometimes providing an alternative to, the high-cost traditional satellites. The author reviews a decade of the University of Surrey's UoSAT microsatellite programme to illustrate the pote... View full abstract»

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  • Ion propulsion-a technology for improving the cost-effectiveness of large communications satellites

    Publication Year: 1992, Page(s):153 - 162
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (860 KB)

    The overall launch mass of a communications satellite has a major influence on its economic performance. If this mass can be reduced substantially, the launch cost will be lower, or more revenue can be generated by carrying a larger payload or extending the operational lifetime. Since an ion propulsion system provides an exhaust velocity at least an order of magnitude higher than that of chemical ... View full abstract»

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