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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 2 • Date April 1984

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Displaying Results 1 - 22 of 22
  • Mean-square correlation of shift-register sequences

    Publication Year: 1984, Page(s):101 - 106
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (610 KB)

    The mean value and the mean-square value of various correlation parameters of linear feedback shift-register sequences are obtained and compared with the corresponding parameters for random sequences. The mean-square correlation parameters for maximal-length shift-register sequences, i.e. pseudonoise or pseudorandom sequences, are considerably better than those for random sequences. The mean-squar... View full abstract»

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  • Serial data transmission over HF radio links

    Publication Year: 1984, Page(s):107 - 116
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1239 KB)

    The paper reports on an investigation into the use of HF radio links for serial data transmission. A prototype test system was developed and used to study the effectiveness of varios methods of modulation and demodulation, to study ways of varying the data rate, to exmine the performance of serial systems as a function of data rate and to investigate the use of adaptive equalisation as a technique... View full abstract»

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  • Simplified estimation of ray-path mirroring height for HF radiowaves reflected from the ionospheric F-region

    Publication Year: 1984, Page(s):117 - 124
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (824 KB)

    From Milsom's equations, which describe the geometry of ray-path hops reflected from the ionospheric F-layer, algorithms for the simplified estimation of mirror-reflection height are developed. These allow for hop length and the effects of variations in underlying ionisation (via the ratio of the F2- and E-layer critical frequencies) and F2-layer peak height (via the M(3000)F2-factor). Separate al... View full abstract»

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  • Facsimile coding using symbol-matching techniques

    Publication Year: 1984, Page(s):125 - 129
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (691 KB)

    In this paper, a symbol-matching technique for digital facsimile transmission is described. This technique results in data compression factors typically 2.5 to 3 times that obtained by the standard CCITT codes. New signal-modification techniques are also described. These distort the picture to be transmitted at a microscopic level to increase the correlation between pels. However, the resulting ga... View full abstract»

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  • Comparison between time-compression multiplexing and frequency-division multiplexing over narrowband radio systems

    Publication Year: 1984, Page(s):130 - 138
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1029 KB)

    Time-compression multiplexing (TCM) is a spectrally efficient, time-domain multiplexing method, which is an alternative to the conventional and widely used frequency-division multiplexing technique (FDM). The paper demonstrates the significant advantages of TCM over FDM when used over narrowband radio systems which contain inherent nonlinearities. Indeed, these nonlinearities can render FDM unusab... View full abstract»

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  • Application of Gram-Schmidt algorithm to optimum radar signal processing

    Publication Year: 1984, Page(s):139 - 145
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (730 KB)

    The paper deals with the application of Gram-Schmidt decorrelation algorithm to the clutter cancellation and useful signal enhancement in radar signal processing. The proposed system architecture is an adaptive implementation of the well known optimum processor. The performance of the selected approach is evaluated and compared with that of the optimum one. As a general result, the adaptation time... View full abstract»

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  • Decision tree design and applications in speech processing

    Publication Year: 1984, Page(s):146 - 152
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (882 KB)

    The design and operation of the minimum cost classifier, where the total cost is the sum of the measurement cost and the classification cost, is computationally complex. Noting the difficulties associated with this approach, decision tree design directly from a set of labelled samples is proposed in this paper. The feature space is first partitioned to transform the problem to one of discrete feat... View full abstract»

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  • Simple cyclic codes for burst errors

    Publication Year: 1984, Page(s):153 - 155
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (334 KB)

    A subset of recently disclosed burst-error correcting codes are described. The procedure for constructing these codes is very simple. An illustrative example is included. The codes are very efficient for most burst lengths. It is found that the efficiency approached maximum possible for burst-error correcting codes as the burst length increases beyond 10. By virtue of the fact that the codes are c... View full abstract»

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  • An analysis of quasi-synchronous AM mobile radio operation and recommended design parameter values

    Publication Year: 1984, Page(s):156 - 166
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1192 KB)

    Quasi-synchronous operation of a number of base transmitters is often used to provide extensive area coverage in land mobile radio systems. An analysis is made of the responses of an AM receiver operating in such a system. The effects of automatic level control and the muting action are shown to nullify any predictions made of system performance based on harmonic distortion of sinusoidal modulatin... View full abstract»

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  • Position, velocity and acceleration estimates from the noisy radar measurements

    Publication Year: 1984, Page(s):167 - 168
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (223 KB)

    A two-dimensional Kalman tracking filter is described for obtaining optimum estimates of position, velocity and acceleration of an aircraft whose acceleration is perturbed due to manoeuvres and/or other random factors. In a track-while-scan operation, a two-dimensional radar sensor is assumed to measure the range and bearing of the vehicle at uniform sampling intervals of time T seconds through ra... View full abstract»

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  • Autocorrelation function of the multiplexed sequence

    Publication Year: 1984, Page(s):169 - 172
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (426 KB)

    A multiplexed sequence is one produced in a specific way by two linear feedback shift registers generating PN sequences, in conjunction with a multiplexer. Such a sequence may be a possible candidate for use as a building block in a sequence generator of a stream cipher system. In this paper, we derive some results concerning the autocorrelation function of this sequence. View full abstract»

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  • M-ary continuous phase frequency shift keying with modulation index 1/M

    Publication Year: 1984, Page(s):173 - 178
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (660 KB)

    In the paper, two techniques for the detection of multilevel continuous phase frequency shift keyed signals with modulation index equal to the inverse of the number of levels (M-ary CPFSK) are described. The first technique is a noncoherent technique which is similar to the conventional differentially coherent detection method of DPSK and the error rate of this detector is equal to the error-rate ... View full abstract»

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  • Detection probability of a partially fluctuating target

    Publication Year: 1984, Page(s):179 - 182
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (477 KB)

    In this paper we consider the problem of target detection in the case that the received signal can be considered a mixture of scan-to-scan and pulse-to-pulse fluctuating signals. We analyse in detail a model which is a simple generalisation of the popular Swerling fluctuations models. We study the incoherent receiver which use postdetection integration and derive a closed form expression for PD wh... View full abstract»

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  • Evaluation of hybrid error control systems

    Publication Year: 1984, Page(s):183 - 193
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1079 KB)

    In the paper, the performances of hybrid as well as of ARQ and FEC systems are evaluated by simulation generating error statistics corresponding to a case of data transmission over local switched telephone lines. The channel model was based on finite time renewal processes. The criteria for a hybrid system with convolution codes were specially developed. The results show that, for simulated channe... View full abstract»

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  • Error probability of QASK with rectangular and circular symbol constellations in the presence of intersymbol quadrature channel and adjacent channel interference

    Publication Year: 1984, Page(s):194 - 202
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (757 KB)

    In the paper we study the effect of intersymbol, quadrature channel and adjacent channel interference (in addition to Gaussian noise) on the error probability of M-ary quadrature amplitude modulation (QAM) with M = 4, 16 symbols and phase shift keying (PSK) with M = 4, 8 and 16 symbols, which are special cases of quadrature amplitude shift keying (QASK) with a rectangular and circular constellatio... View full abstract»

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  • Multiple open-loop interference canceller for a rotating search radar

    Publication Year: 1984, Page(s):203 - 207
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (634 KB)

    This paper describes the construction and operation of a triple open-loop interference canceller for a high-PRF high-rotation-rate search radar. Experimental results show that up to 25 dB reduction in jamming power can be achieved when countering the effects of one, two or three jammers present in the sidelobes of the main antenna, without significantly affecting target detection. Results also sho... View full abstract»

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  • Pseudobinary Viterbi detector

    Publication Year: 1984, Page(s):208 - 218
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1540 KB)

    Among the detection processes that have recently been described for use in a 9600 bit/s modem are `pseudobinary¿¿ processes that are developments of the pseudobinary Viterbi detector. Although no information has been published on the latter, it is of considerable interest both in its own right and in its performance relative to that of other detectors. The aim of the paper is to correct this omiss... View full abstract»

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  • Measurement of signal to quantising-noise ratio in ADPCM systems and its implications for echo cancellation

    Publication Year: 1984, Page(s):219 - 222
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (363 KB)

    It is questioned whether the standard pulse code modulation (PCM) quantisation distortion test using a narrow band of noise is appropriate to adaptive systems. An investigation of such measurements has been carried out in relation to the use of echo cancellers, where the amount of echo cancellation that can be achieved is a function of the available signal/noise ratio. The recommended performance ... View full abstract»

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  • Rapid acquisition techniques in CDMA spread-spectrum systems

    Publication Year: 1984, Page(s):223 - 232
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (977 KB)

    A rapid acquisition scheme for code division multiple access (CDMA) spread-spectrum systems which utilises partial correlation of maximum length sequences is investigated. The method involves subsequence matched filtering (SMF) to acquire sync. and feedback control to verify sync. acquisition. Expressions of probabilities of sync. acquisition, false alarm, false dismissal and mean acquisition time... View full abstract»

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  • Radar mortar locator development in the UK: the first 30 years

    Publication Year: 1984, Page(s):233 - 239
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1188 KB)

    The advent of centimetric radar techniques in the early 1940's initiated the investigation of some rather novel system applications. One example is that of locating the firing position of hostile artillery. The basic problems in the weapon locating scene are reviewed and the evolutionary progression in UK system developments over a 30 year period is described. View full abstract»

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  • Erratum: Error patterns in correlators with four-level quantisation

    Publication Year: 1984
    IEEE is not the copyright holder of this material | PDF file iconPDF (65 KB)
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  • Baseband video distortion in memoryless nonlinear bandpass amplifiers

    Publication Year: 1984
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (111 KB)

    An expression is obtained for the spectra of the video baseband distortion resulting from the common amplification of multiple equal-amplitude equally-spaced (in frequency) FM/FDM carriers activated by similar video signals. View full abstract»

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Aims & Scope

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

Full Aims & Scope