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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 5 • Date October 1980

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Displaying Results 1 - 11 of 11
  • Generalisations of maximum-entropy pattern analysis

    Publication Year: 1980 , Page(s): 341 - 353
    Click to expandAbstract | PDF file iconPDF (1656 KB)  

    It is shown that the widely used discrete Fourier transform entails hidden unnecessary and often unrealistic assumptions. The more powerful maximum-entropy method generates an all-pole spectrum avoiding these pitfalls - at the cost of more complex computation - but it too contains certain implicit restrictions. Some of these may be eased by newer methods allowing for spectra with zeros as well as ... View full abstract»

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  • Optimisation of rejection filters

    Publication Year: 1980 , Page(s): 354 - 360
    Cited by:  Papers (3)
    Click to expandAbstract | PDF file iconPDF (645 KB)  

    The problem of separating unknown signals from much stronger `coloured¿¿ noise often arises in radar receivers (m.t.i. cancellers) and antenna sytems (directive noise in phased-array antennas). Two main optimisation criteria can be used to design rejection filters, namely (i) the maximisation of average signal/interference ratio (based on the evaluation of the eigenvectors of the interference cova... View full abstract»

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  • Quiet tuning and matching of antennas for radio-silence operation

    Publication Year: 1980 , Page(s): 361 - 367
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (606 KB)  

    Appropriate impedance detectors placed within an antenna impedance-matching unit can facilitate rapid automatic matching. However, the operation of the detectors normally requires a substantial r.f. signal to be passed through the matching unit and this can cause undesirable radiation from the antenna. A novel impedance detection technique is described which operates with such low r.f. signals tha... View full abstract»

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  • Compact low-power coder for extreme bit rate reduction of television pictures

    Publication Year: 1980 , Page(s): 368 - 383
    Click to expandAbstract | PDF file iconPDF (4864 KB)  

    A subsystem is described which enables real-time television pictures to be transmitted with very low bit rates while preserving spatial and temporal resolutions adequate for scene monitoring. The chief design constraints were to minimise the size and power consumption in an inexpensive robust construction. This was achieved by optimising the frame rate and picture resolution and by removing image ... View full abstract»

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  • Short pulse radar for stratified lossy dielectric layer measurement

    Publication Year: 1980 , Page(s): 384 - 388
    Cited by:  Papers (3)
    Click to expandAbstract | PDF file iconPDF (549 KB)  

    Detection and measurement of stratified, lossy, dielectric layer interface position was achieved by a radar using a single cycle of 1 GHz carrier repeated every 1 ¿¿s. Real time signal processing allowed site measurement to be made on coal seam thickness. View full abstract»

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  • Soft-decision error control for H.F. data transmission

    Publication Year: 1980 , Page(s): 389 - 400
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (1382 KB)  

    This paper is concerned with the soft-decision decoding of error-correcting codes in the context of h.f. data transmission. The use of soft-decision information from the data modem results in an improvement in the performance of a forward-error-correction scheme, when compared with hard-decision decoding, without any further redundancy penalty. In the paper, we estimate the theoretical improvement... View full abstract»

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  • Interpolating sampled cross-correlation surfaces of images for fine registration

    Publication Year: 1980 , Page(s): 401 - 404
    Click to expandAbstract | PDF file iconPDF (413 KB)  

    Spatially sampled pictures may be registered to an accuracy of half a pixel by computing the extremum of the cross-correlation surface; when a higher accuracy is required it is necessary to interpolate the cross-correlation surface. It is shown that, when product correlation is used, the interpolation of the cross-correlation surface is equivalent to using the same interpolation process to derive ... View full abstract»

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  • Bandwidth compression of digital colour-television signals using block-adaptive d.p.c.m.

    Publication Year: 1980 , Page(s): 405 - 409
    Click to expandAbstract | PDF file iconPDF (523 KB)  

    This paper describes an adaptive algorithm which is capable of composite coding of broadcast-quality colour-television signals at a low bit rate. The technique involves block-adaptive predictors and block-adaptive variable-length and fixed-length quantisers. The adaptation algorithm has been extended to work at any desirable sampling frequency. As a result the low bit rate is obtained by a reducti... View full abstract»

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  • M-ary c.p.s.k. signalling over two-link nonlinear channels in additive Gaussian noise

    Publication Year: 1980 , Page(s): 410 - 414
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (509 KB)  

    This paper presents a method of analysing the performance of M-ary coherent phase-shift-keyed (c.p.s.k.) signals transmitted through a bandpass nonlinearity, exhibiting a.m./a.m. and a.m./p.m. conversions, and in the presence of additive Gaussian noise both preceding and following the nonlinearity. The method is computationally superior to those previously obtained by other workers, especially for... View full abstract»

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  • Conference reports. IEEE international radar conference

    Publication Year: 1980 , Page(s): 415 - 419
    PDF file iconPDF (847 KB)  
    Freely Available from IEEE
  • Conference reports. Radio spectrum conservation techniques

    Publication Year: 1980 , Page(s): 419 - 420
    PDF file iconPDF (364 KB)  
    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope