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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 5 • Date August 1983

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Displaying Results 1 - 16 of 16
  • Radar performance studies of adaptive lattice clutter-suppression filters

    Publication Year: 1983, Page(s):357 - 367
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1459 KB)

    The paper describes the use of a prediction-error filter (realised in the form of an adaptive lattice filter) for enhancing the detection of a moving target (for example aircraft and migrating flocks of birds) in the presence of clutter. This process is well suited for use in a surveillance radar environment (for example air-traffic control). The clutter may arise owing to reflections from ground ... View full abstract»

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  • Detection process of a 9600 bit/s serial modem for HF radio links

    Publication Year: 1983, Page(s):368 - 376
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1266 KB)

    The paper describes a near-maximum-likelihood detection process suitable for use in a synchronous serial digital data transmission system that operates at 9600 bit/s over an HF radio link. The data signal at the input and output of the HF radio link is here a 2400 baud 16-level QAM signal with a bandwidth (measured between the 6 dB points) from about 600 to 3000 Hz. The detector is a development o... View full abstract»

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  • Signal strength prediction in built-up areas. Part 1: Median signal strength

    Publication Year: 1983, Page(s):377 - 384
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (959 KB)

    Field trials in London between an elevated base station and a mobile moving in the city streets have produced a propagation data base at frequencies between 168 and 900 MHz. Various important parameters such as range, frequency and relative height, together with quantitative measures of the extent of urbanisation, have been used in conjunction with the data base to produce signal strength predicti... View full abstract»

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  • Signal strength prediction in built-up areas. Part 2: Signal variability

    Publication Year: 1983, Page(s):385 - 391
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (742 KB)

    Analysis of mobile radio propagation results in London at 168, 455 and 900 MHz has shown that over small areas the signal envelope is well described by Rayleigh statistics, the local mean over larger similar areas being lognormally distributed. A comparison of different statistical distributions has been undertaken to provide a bridge between the local and global statistics and it shows that the e... View full abstract»

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  • Side-looking sonar or radar using phase difference monopulse techniques. Coherent and noncoherent applications

    Publication Year: 1983, Page(s):392 - 398
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (865 KB)

    Although coherent synthetic apertures are common in radar, coherent apertures in sonar are difficult to synthesise with a single moving element owing to positional uncertainty and the very imperfect nature of the sonar propagation medium. The two techniques described in the paper show how a pair of receivers coupled in a phase-difference or phase-comparison monopulse configuration can reduce the e... View full abstract»

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  • Overview of analogue signal encryption

    Publication Year: 1983, Page(s):399 - 404
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (789 KB)

    The paper is a review of the subject of analogue encryption. The rank correlation approach to the study of permutations is also reviewed. Some families of permutations that have been used in scrambling systems are described. The problems of analogue encryption, as well as its scope, are analysed. View full abstract»

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  • Optimisation of a generalised square-law detector

    Publication Year: 1983, Page(s):405 - 408
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (435 KB)

    An interference improvement factor (IIF) is derived for a generalised square-law detector utilised for a radar application. This factor, which is a ratio of two quadratic forms, incorporates the effects of antenna beam shape as the radar beam scans over the target, interference due to receiver noise plus clutter and the target Doppler frequency. The IIF can be maximised to improve target detectabi... View full abstract»

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  • Parallel architectures for computing cyclic convolutions

    Publication Year: 1983, Page(s):409 - 416
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (744 KB)

    In the paper two parallel architectural structures are developed to compute one-dimensional cyclic convolutions. The first structure is based on the Chinese remainder theorem and Kung's pipelined array. The second structure is a direct mapping from the mathematical definition of a cyclic convolution to a computational architecture. To compute a d-point cyclic convolution the first structure needs ... View full abstract»

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  • Electronic steering of antenna nulls for interference reduction

    Publication Year: 1983, Page(s):417 - 422
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (956 KB)

    The paper reports on theory, tests and design of a low-cost broadband radio-frequency device that combines signals from two antennas to selectively null interfering signals. The theory and analysis of limitations pertain to both manual and adaptive null control devices. Tests illustrate cases in which nulling works well and those where propagation features limit null effectiveness. An important re... View full abstract»

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  • Hardware-based Fourier transforms: algorithms and architectures

    Publication Year: 1983, Page(s):423 - 432
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1239 KB)

    Many signal processing systems rely on the efficient calculation of the discrete Fourier transform. The basic equations are manipulated to yield architectures to suit differing technologies and performance requirements. Finally a prime-radix transform algorithm is described offering very high performance that is ideally suited to present-day technology. View full abstract»

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  • Broadband adaptive array processing

    Publication Year: 1983, Page(s):433 - 440
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    The paper describes a new procedure for designing linear adaptive arrays with a controllable broadband capability. The new prodecure allows acceptable array performance to be achieved without the need for broadband presteering delays. The approach relies on the use of a special array weight vector constraint involving |w|. Convergent algorithms for solving the new broadband design procedure are de... View full abstract»

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  • Nonlinear image processing for optimum composite source coding

    Publication Year: 1983, Page(s):441 - 451
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1241 KB)

    The concept of composite source coding for efficient image transmission or storage is addressed in the paper, and specific properties characterising the component sources are determined. An approach is developed which decomposes typical image signals into two independent additive components. Each component is subsequently encoded separately for storage or transmission. These individual components ... View full abstract»

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  • Analysis of HF interference with application to digital communications

    Publication Year: 1983, Page(s):452 - 458
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (782 KB)

    The paper gives measured statistics of interfering signals in the HF band, and uses these results to gain an improved understanding of the operation of various digital communication systems in the presence of interference. A novel diversity combiner and a frequency-hopping modem have been constructed using the statistics as design aids, and the systems exhibit good operation in interference. View full abstract»

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  • Hybrid frequency-domain coding of speech signals

    Publication Year: 1983, Page(s):459 - 467
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (934 KB)

    A new method of speech coding called hybrid frequency-domain coding is introduced and its application to speech transmission at bit rates of 7.2 and 9.6 kbit/s is studied. The hybrid frequency-domain coding system is based on a combination of sub-band coding and transform coding techniques. Subjective tests have shown that the quality of speech produced by the hybrid frequency-domain technique at ... View full abstract»

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  • Class of linear cyclic block codes for burst errors occurring in one-, two- and three-dimensional channels

    Publication Year: 1983, Page(s):468 - 475
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (763 KB)

    Owing to various natural and man-made noise, burst errors occur in one-, two- and three-dimensional telecommunication channels. In the paper, a class of linear cyclic block codes, which can correct all burst errors occurring in these types of channels, is described. The codes devised make use of the statistical description of the channel and the estimates of the possible error patterns which may o... View full abstract»

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  • Weibull-Distributed sea clutter

    Publication Year: 1983
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (114 KB)
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Aims & Scope

The latest version of this title is Radar, Sonar & Navigation, IET.

Full Aims & Scope