By Topic

Communications, Radar and Signal Processing, IEE Proceedings F

Issue 3 • Date June 1984

Filter Results

Displaying Results 1 - 12 of 12
  • Sonar

    Publication Year: 1984 , Page(s): 241 - 242
    Save to Project icon | PDF file iconPDF (327 KB)  
    Freely Available from IEEE
  • Sidescan sonar

    Publication Year: 1984 , Page(s): 243 - 256
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2591 KB)  

    The paper starts with a review of sidescan imagery and the history of sidescan sonar and continues with the acoustic and technical factors affecting the sonar design for any specified application. There follows a description of present-day applications in the civilian field, and the paper ends with discussion of possible future developments. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Review of high-speed sector-scanning sonar and its application to fisheries research

    Publication Year: 1984 , Page(s): 257 - 269
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2084 KB)  

    A brief introduction is given to the functions of detection and classification of underwater objects by sonars which scan large volumes of water. For classification purposes the system must have high angular resolution in at least one plane, and this, coupled with high-speed scanning to cover the width of a sector within the time duration of the transmit pulse, typifies what is called `within-puls... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Continuous transmission FM sonar with one octave bandwidth and no blind time

    Publication Year: 1984 , Page(s): 270 - 274
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (688 KB)  

    Despite the advantage of high average power output, traditional continuous transmission FM (CTFM) sonars suffer from two major defects: separate transmit and receive transducers are required, and the demodulated signal is unavailable for a proportion of the sweep period. The paper shows how, by using a dual-demodulation system, the demodulated signal can be made continuous, resulting in the comple... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discussion of the finite-element modelling and performance of ring-shell projectors

    Publication Year: 1984 , Page(s): 275 - 279
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (669 KB)  

    The paper discusses the finite-element modelling and performance of ring-shell projectors, a particular type of flextensional projector. A ring-shell projector can be used near its resonance frequency as a high-power source, or as a moderate-power broadband source. The most recent design of ring-shell projector has a resonance frequency of 349 Hz, a mechanical Q-factor of 10.6 and a source level o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some practical considerations in the design of sandwich transducers and their arrays

    Publication Year: 1984 , Page(s): 280 - 284
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (604 KB)  

    This paper describes the evolution of a 10.5 kHz sandwich element, developed to suit a cylindrical transducer array. It is essentially a guide to the practical problems encountered in designing sandwich elements, and the equations used are very much simplified. The approach is somewhat empirical, the eventual design being reached after differing prototype elements had been constructed; however, ev... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-frequency sonar transducers: a review of current practice

    Publication Year: 1984 , Page(s): 285 - 297
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1647 KB)  

    The paper is a review of current design and constructional practice of conventional high-frequency transducers which make use of piezoelectric plates and discs. The main design technique is based on the concept of the equivalent circuit, and to emphasise the design techniques three contemporary designs of increasing sophistication are detailed. The problems likely to be encountered are discussed. ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the response of a towed array to the acoustic field in shallow water

    Publication Year: 1984 , Page(s): 298 - 307
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1325 KB)  

    A theoretical treatment of the response of a towed array to the acoustic field from a point source in isovelocity shallow water is presented. The analysis, which is based on a wave-theoretical representation of the field, reveals several interesting effects when the source is endfire-on to the array. Beam broadening or beam splitting may occur due to the distribution of the modal energy in elevati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of the relative sonar performance of incoherent and coherent processing against echo fading in shallow water

    Publication Year: 1984 , Page(s): 308 - 314
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (762 KB)  

    The problem of echo fading and the inherent time- and frequency-diversity reception provided by coherent processing is discussed, leading to a description of an experimental investigation into the shallow-water performance of a coherent processor. A statistical analysis of the results clearly demonstrates the benefits of coherent processing in reducing the effects of echo fading and providing a si... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ship velocity determination by Doppler and correlation techniques

    Publication Year: 1984 , Page(s): 315 - 326
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1487 KB)  

    Traditional speed measuring devices have been largely replaced by the acoustic Doppler log. This can make measurements of velocity relative to the sea bed, but only in modest operating depths. Greater depths can be attained using the correlation log. This is not yet an established technique, and the principles of the design parameters for a satisfactory system are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Architectural approach to alternate low-level primitive structures (ALPS) for acoustic signal processing

    Publication Year: 1984 , Page(s): 327 - 333
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (815 KB)  

    The input/output relationship describing a given signal-processing application in its entirety can be partitioned into a set of primitive operations which may be represented using signal-processing graph notation (SPGN) as a network of interconnected processes. A set of alternate low-level primitive structures (ALPS) can be defined to implement the operations underpinning each node in this network... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modular design of sonar systems using functional units built from a standard set of VLSI building blocks

    Publication Year: 1984 , Page(s): 334 - 340
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (693 KB)  

    The paper describes work being carried out at the Plessey Marine Research Unit on the application of VLSI building block and novel architecture to future generation sonar systems. The emphasis in on high speed good dynamic range and good accuracy in the arithmetic units and a design procedure which will enable the sonar signal processor to be designed by a system designer. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

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

Full Aims & Scope