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1887

Radio and Electronic Engineer

Volume 46, Issue 10, October 1976

Volumes & issues:

Volume 46, Issue 10

October 1976

Seventy five years of British Standards
Design techniques for integrated microwave amplifiers using gallium arsenide field-effect transistors
Identification of complex geometrical shapes by means of low-frequency radar returns
  • Author(s): Y.-T. Lin  and  A.A. Ksienski
  • Source: Radio and Electronic Engineer, Volume 46, Issue 10, p. 472 –486
  • DOI:  10.1049/ree.1976.0071
  • Type: Article
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  • p. 472 –486 (15)
    A study of the effectiveness of low-frequency electromagnetic responses for identifying objects of complex shape is presented. The linear separability of a large variety of objects such as cubes, cylinders and aircraft were examined. Two classification algorithms, a linear discriminant and a nearest neighbour rule, were used to classify a set of four aircraft models. The classification performance is presented in terms of the probability of misclassification versus noise level. The effectiveness of the various combinations of electromagnetic features was evaluated. The results indicate that amplitude, phase and polarization all contribute substantial amounts of target information. Making the assumption of a priori knowledge of the target's approximate aspect angle, a reliable classification can be attained utilizing a rather small number of frequencies.
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The comparative cost of associative memory
  • Author(s): R.M. Lea
  • Source: Radio and Electronic Engineer, Volume 46, Issue 10, p. 487 –496
  • DOI:  10.1049/ree.1976.0072
  • Type: Article
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  • p. 487 –496 (10)
    The production cost-per-bit of high-speed associative memory, implemented with m.o.s. l.s.i. content addressable memory (c.a.m.) devices (selected from a survey of 20 designs), is compared with that of conventional memory, implemented with currently available m.o.s. l.s.i. random access memory (r.a.m.) devices.For a development cost of about £20k, the cost-perbit of the m.o.s. c.a.m.s is about 5× that of a 1024-bit p-channel m.o.s. dynamic r.a.m. and about 9× that of a 4096-bit n-channel m.o.s. dynamic r.a.m., if plastic dual-in-line packaging is employed. However, for open-chip (beam-lead or flip-chip) assembly the cost-per-bit of the m.o.s. c.a.m.s is less than 2× that of the 1024-bit r.a.m. and less than 3× that of the 4096-bit r.a.m.It is shown that for most associative processing applications the associative memory can provide a cheaper alternative to conventional r.a.m.-based computer systems.
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Error-rate in a digital simplex telemetry system
  • Author(s): M. Aslam ; R. Jones ; D.R. Ormerod ; R. Steele
  • Source: Radio and Electronic Engineer, Volume 46, Issue 10, p. 497 –504
  • DOI:  10.1049/ree.1976.0073
  • Type: Article
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  • p. 497 –504 (8)
    This paper describes the digital part of a simplex binary telemetry system for conveying control signals to some remote body such as a missile. The decoder in the remote body is small, light, has a low power consumption, and is designed to operate above a certain noise threshold. When the signal-to-noise ratio of the signal at the input to the decoder is low the latter only accepts information which has a high probability of being correct thereby causing the rejection of most of the transmitted information. When information is rejected the remote body functions on the data which were last accepted by the decoder.Both experimental and theoretical results are presented for error rate and received frame rate, and the effect of asymmetry in the binary channel is examined.
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A confederation to protect professional interests
  • Author(s): Lord Hailsham of St. Marylebone
  • Source: Radio and Electronic Engineer, Volume 46, Issue 10, p. 506 –508
  • DOI:  10.1049/ree.1976.0074
  • Type: Article
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  • p. 506 –508 (3)
    The professions should be more united and self-conscious of their separate interests in putting forward their distinctive point of view, emphasized Lord Hailsham when he delivered the Fourth Rivers Lecture to The Institute of Chartered Secretaries and Administrators. Saying that the professions were unrepresented at the highest levels Lord Hailsham asked: ‘If there can be a Confederation of British Industry why can there not be a Confederation of British Professional Associations, however loosely associated, to identify the problems which affect us all’?
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Letter to the Editor: Fighting for the professional engineer
Launch of Decca ship simulator

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