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Radio and Electronic Engineer

Issue 8.9 • Date August/September 1982

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Displaying Results 1 - 13 of 13
  • A university satellite project

    Publication Year: 1982, Page(s):359 - 360
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (257 KB)

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  • UOSATߞan investigation into cost-effective spacecraft engineering

    Publication Year: 1982, Page(s):363 - 378
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2965 KB)

    The UOSAT Project commenced at the University of Surrey in 1979 to investigate the feasibility of, and the engineering problems associated with, the design, construction, launch and orbital operation of a relatively small and inexpensive spacecraft capable of a worthwhile contribution to the scientific, engineering and educational communities. The paper outlines the background to the project and t... View full abstract»

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  • Attitude control and dynamics of UOSAT angular motion

    Publication Year: 1982, Page(s):379 - 384
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (718 KB)

    The dynamics of UOSAT after launch are briefly reviewed and also the stages which are believed necessary to achieve a transition from an arbitrary state of nutation to one of damped gravity gradient and correct Earth-centred orientation. Novel algorithms have been developed as a form of adaptive commutation using the on-board magnetorquer. View full abstract»

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  • The primary UOSAT spacecraft computer

    Publication Year: 1982, Page(s):385 - 390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (807 KB)

    Two computer systems have been incorporated into the UOSAT spacecraft, the primary spacecraft computer being based on the RCA CDP 1802 microprocessor, and the secondary computer on the Ferranti F100 system. This paper describes the system philosophy and design consideration of the primary computer, particularly as regards its operation in a space environment where low power and reliability are ess... View full abstract»

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  • A low-power 16-bit computer for space applications on UOSAT

    Publication Year: 1982, Page(s):391 - 397
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (806 KB)

    UOSAT secondary computer provides a system for the evaluation of higher risk computing technologies, including a 16-bit bipolar microprocessor and large static o.s. memories. The system has both simple interfaces the satellite and a simple loading command structure. A significant feature of the design is the provision for lowpower operation in which the processor consumes a high supply current onl... View full abstract»

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  • The development of a satellite-borne Earth imaging system for UOSAT

    Publication Year: 1982, Page(s):398 - 402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (892 KB)

    Earth imaging systems have, in the past, involved the construction of fairly complex photographic and photoelectrical conversion techniques. Furthermore, the format of data transmission has restricted the widespread use such data in educational establishments due to the fairly complex and costly receiving and display apparatus required. In this paper the development of a simple imager using a two-... View full abstract»

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  • The uosatmma and u.h.f. data beacons and antenna system

    Publication Year: 1982, Page(s):403 - 406
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (628 KB)

    single canted turnstile antenna is used for satellite transmission and command reception in the v.h.f. and f. bands. Details of the antenna hybrid and coupling filters are given, together with performance measurements. The v.h.f. and u.h.f. beacons use 5th overtone oscillators 72 MHz, and a multistage varactor modulator provides sufficient phase modulation with overall frequency multiplication of ... View full abstract»

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  • The UOSAT h.f.beacons experiment

    Publication Year: 1982, Page(s):407 - 411
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (583 KB)

    University of Surrey amateur scientific satellite, UOSA T carries a set of phase related beacons on 7, 14, and 29 MHz enabling experiments to be carried out trans-ionospheric propagation at the four frequencies beacons, which deliver 100 mW each, are synthesized the 7 MHz master oscillator and combined into one two 2-5 m monopoles tuned against the satellite body 15-metre boom. Modulation is by on... View full abstract»

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  • The UOSAT microwave beacons

    Publication Year: 1982, Page(s):412 - 416
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (501 KB)

    The paper discusses the design and construction of the UOSA T microwave beacons. Several interesting design features are apparent, and these have been employed in an attempt to provide space-borne microwave transmissions for use with low-cost ground stations. In particular, difficulties due to excessive range loss have been partially overcome by the use of sophisticated design techniques, without ... View full abstract»

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  • The UOSAT telemetry system

    Publication Year: 1982, Page(s):417 - 424
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (884 KB)

    This paper describes the telemetry system for the satellite UOSAT) designed and built in the Department of Electronic and Electrical Engineering of the University of Surrey. The function of the telemetry system is to encode outputs of sensors, located around the spacecraft, into specified data formats prior to transmission via downlink transmitters. In addition, information relating to the status ... View full abstract»

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  • Power supplies, conditioning and distribution on UOSAT

    Publication Year: 1982, Page(s):425 - 430
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (517 KB)

    The paper describes the solar arrays, the batteries and their characteristics, and how the control of power is managed on board UOSAT. View full abstract»

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  • The UOSAT magnetometer experiment

    Publication Year: 1982, Page(s):431 - 436
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1526 KB)

    Much still remains to be learned about the Earth's magnetic field and, in particular, the variations that occur as a result of solar-terrestrial interaction. The magnetometer on board UOSAT has a resolution of ±2 nT which is within a factor of two of the most sensitive magnetometer ever put into space. This, coupled the polar orbit of the satellite and its expected life of several years, should r... View full abstract»

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  • The UOSAT radiation-monitor experiment

    Publication Year: 1982, Page(s):437 - 439
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (331 KB)

    The radiation-monitor experiment for the UOSAT spacecraft is described. This instrument employs two G-M tubes with energy thresholds of 20 and 40 keV. The tubes are sampled 5 times each second and the count rate telemetered to ground directly or stored for later transmission. Examples of observations during geomagnetically quiet and disturbed conditions are presented. View full abstract»

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