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Communications, Radar and Signal Processing, IEE Proceedings F

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  • 1. The geometry of bistatic radar systems

    Publication Year: 1986, Page(s):604 - 612
    Cited by:  Papers (32)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1056 KB)

    Unless the separation between transmitter and receiver is small compared with ranges of interest, bistatic radars have a number of properties which differ significantly from the monostatic equivalents. Some of these produce operational advantages which provide a motivation for deployment, while others merely bring trouble and expense. The paper considers the basic bistatic properties which depend ... View full abstract»

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  • 2. Digital signal processing for target detection FMCW radar

    Publication Year: 1981, Page(s):331 - 336
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (717 KB)

    The paper describes a method of digital signal processing for extracting and isolating targets in the return signal of an FMCW radar. Digital filtering of the frequency spectrum of the return signal is followed by nonlinear optimisation to detect the presence of multiple targets amid clutter. Results using a practical radar show that the method gives enhanced detection of weak return signals. View full abstract»

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  • 3. A complex gradient operator and its application in adaptive array theory

    Publication Year: 1983, Page(s):11 - 16
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (673 KB)

    The problem of minimising a real scalar quantity (for example array output power, or mean square error) as a function of a complex vector (the set of weights) frequently arises in adaptive array theory. A complex gradient operator is defined in the paper for this purpose and its use justified. Three examples of its application to array theory problems are given. View full abstract»

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  • 4. Design and performance of airborne radomes: a review

    Publication Year: 1981, Page(s):451 - 464
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1773 KB)

    The ever increasing demands on the performance of airborne antennas place comparable demands on the design of the enclosing randome to ensure minimal degradation of the antenna radiation pattern. Radomes for airborne application can be separated into three main categories: large aircraft radomes of either the nose-cone or under-fuselage type, small aircraft radomes often flush mounted to the airfr... View full abstract»

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  • 5. Digital beam forming for radar

    Publication Year: 1980, Page(s):266 - 277
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1353 KB)

    Development of digital methods for antenna beam forming in the receiving mode of a radar can be advantageous in providing the system with a high degree of flexibility in `beam-pattern management¿ for countering e.c.m. and providing multiple functions efficiently. The justification for incorporating digital methods and various possible arrangements are discussed first. The main body of the paper i... View full abstract»

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  • 6. Digital beam forming for sonar systems

    Publication Year: 1980, Page(s):257 - 265
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1220 KB)

    Current generation sonar systems employ high temporal and spatial resolution to achieve acceptable operational performance. This, together with the physical mechanisms of acoustic propagation in the ocean, places a number of constraints on the implementation of beam-forming systems for sonar applications that are in many ways unique; in particular: (a) Low sonar operating frequencies and the use o... View full abstract»

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  • 7. Radar detection prediction in sea clutter using the compound K-distribution model

    Publication Year: 1985, Page(s):613 - 620
    Cited by:  Papers (38)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (945 KB)

    In the paper the radar detection of targets in sea clutter modelled by the compound K-distribution is examined from a statistical detection viewpoint. Optimum performance is determined for both fixed threshold and ideal constant false alarm rate (CFAR) receivers for targets modelled by Swerling cases 0, 1 and 2. In particular, the performance of dual threshold binary integrators is assessed. The c... View full abstract»

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  • 8. Effect of Fresnel ripples on sidelobe suppression in low time-bandwidth product linear FM pulse compression

    Publication Year: 1982, Page(s):41 - 44
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (457 KB)

    The paper discusses the effects of Fresnel ripples on the suppression of peak time sidelobes in low time-bandwidth (TB) product linear-FM pulse compression systems employing internally Hamming weighted compression filters. Two methods for the reduction of these effects are investigated. The first, amplitude tapering of the rectangular FM pulse, yields significantly diminished sidelobes for TB prod... View full abstract»

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  • 9. Introduction to electronic warfare

    Publication Year: 1982, Page(s):113 - 132
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3554 KB)

    The paper discusses the overall concept of electronic warfare (EW) and defines its three main subsets: electronic support measures (ESM), electronic countermeasures (ECM) and electronic counter-countermeasures (ECCM). The requirements for ESM receivers are reviewed in the context of two specific scenarios: that of intelligence gathering for communications and radar. The different current ESM recei... View full abstract»

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  • 10. Waveform design and doppler sensitivity analysis for nonlinear FM chirp pulses

    Publication Year: 1986, Page(s):163 - 175
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1251 KB)

    The use of pulse compression to obtain simultaneous long-range detection and good range resolution is described. The types of modulation that can be used to obtain pulse compression are outlined with particular emphasis on their performance under Doppler shift. It is shown that nonlinear frequency-modulated (FM) signals are capable of providing low range-sidelobes while being compressed using a ma... View full abstract»

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  • 11. Maximum entropy method in image processing

    Publication Year: 1984, Page(s):646 - 659
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1827 KB)

    Maximum entropy has proved to be an enormously powerful tool for reconstructing images from many types of data. It has a privileged position as the only consistent method for combining different data into a single image. It has been used most spectacularly in radio astronomical interferometry, where it deals routinely with images of up to a million pixels, and high dynamic range. We also give exam... View full abstract»

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  • 12. Survey of bistatic and multistatic radar

    Publication Year: 1986, Page(s):587 - 595
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1077 KB)

    A view of the broad subject area of multistatic radar is given in an attempt to clarify the several different terms used for various possible configurations and to classify them. The potential of multistatic systems compared to monostatic ones is listed, and the dependence on different configurations, types of co-operation, implemented techniques, modes of operation and different applications are ... View full abstract»

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  • 13. Comparison between steepest descent and LMS algorithms in adaptive filters

    Publication Year: 1987, Page(s):283 - 289
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (713 KB)

    It is commonly stated that the least-mean-square (LMS) algorithm for adaptive filters is a stochastic version of the steepest descent (SD) optimisation technique, although little work on comparative studies has been reported. The present paper sets out a detailed theoretical and experimental comparison. Equations are derived for the directional variance of the estimated gradient, and these are the... View full abstract»

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  • 14. Optimum MSK-type receivers for CPM on Gaussian and Rayleigh fading channels

    Publication Year: 1984, Page(s):480 - 490
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1153 KB)

    Power efficient schemes with excellent power spectra are contained among the continuous phase modulation (CPM) schemes. This is a constant envelope digital modulation technique, which in general requires a maximum-likelihood sequence detector (Viterbi detector) for efficient detection. This optimum receiver is sometimes complex. In this paper a parallel MSK-type receiver is studied. It is useful f... View full abstract»

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  • 15. Spatial correlation in K-distributed sea clutter

    Publication Year: 1987, Page(s):526 - 532
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (921 KB)

    The compound K-distribution model for sea clutter previously described in the literature provides the foundation for a quantitative treatment of the spatial and temporal correlation characteristics of the envelope of clutter returns. In the paper the compound K-distribution model is extended to cover the spatial characteristics of sea clutter. The relationship of these characteristics to the physi... View full abstract»

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  • 16. Theory of radar detection in coherent Weibull clutter

    Publication Year: 1987, Page(s):174 - 190
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1847 KB)

    The paper deals with the problem of radar detection of a target echo embedded in Weibull clutter and white Gaussian noise (WGN). Relevant features of the paper, with respect to previous papers on the same subject, refer to the coherent nature of the Weibull process (that modelling the clutter) and of the processing chain. In more detail, the in-phase and quadrature components of the clutter echoes... View full abstract»

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  • 17. Sensitivity of crystal video receivers

    Publication Year: 1985, Page(s):233 - 244
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1240 KB)

    Tangential sensitivity is shown to be an inadequate criterion for comparing the operational performance of wideband crystal video ESM receivers. By contrast, it is shown that `receiver sensitivity¿¿ is completely described by a criterion that specifies a required signal detection probability for a give false-alarm rate. In particular, this alternative criterion is necessary for the correct design ... View full abstract»

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  • 18. Spiral antennas for ESM

    Publication Year: 1985, Page(s):245 - 251
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (877 KB)

    The reason for the popularity of the cavity-backed spiral antenna in ESM systems is discussed, together with the surprising lack of supporting analysis and detailed understanding of its operation. In the absence of any published mathematical analysis of the complete antenna, the function and principle of operation of the three main antenna components¿¿the spiral radiator, backing cavity and balun ... View full abstract»

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  • 19. Asymptotic results for eigenvector methods

    Publication Year: 1985, Page(s):589 - 594
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (569 KB)

    Asymptotic results are presented for the MUSIC and Kumaresan and Tufts spectral estimators. The paper makes use of results obtained by Sugiura, which are more accurate than those of Anderson. It is shown that the predictions are in good agreement with simulated results. View full abstract»

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  • 20. Integration and testing of an SS-TDMA 120 Mbit/s regenerative repeater for advanced communications satellites at K-band

    Publication Year: 1987, Page(s):499 - 509
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1193 KB)

    The paper deals with a test campaign performed on a regenerative repeater with an onboard baseband switching matrix (BBSM), able to set up a satellite-switched, time-division multiple-access (SS-TDMA) system. We first address the optimisation of the transmission channel (filters, TWTA back-off etc. ) on the basis of BER measurements, and then examine some functional tests including a TDMA terminal... View full abstract»

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  • 21. Characterisation of radar clutter as a spherically invariant random process

    Publication Year: 1987, Page(s):191 - 197
    Cited by:  Papers (82)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1028 KB)

    A statistical characterisation of clutter as a complex random process is needed in the design of optimum detection schemes. The paper considers modelling complex clutter as a spherically invariant random process (SIRP), namely assuming that its PDFs can be expressed as non-negative definite quadratic forms, a generalisation of a Gaussian process. Relevant properties of SIRPs are summarised, and sh... View full abstract»

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  • 22. Tracking systems for satellite communications

    Publication Year: 1988, Page(s):393 - 407
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2247 KB)

    Satellites in nominally geostationary orbits possess diurnal motion which causes the apparent position of the spacecraft to wander in the sky as seen by an earth station. If uncompensated this causes a variation in the performance of the communications link. The motion of the satellite therefore has to be tracked by the earth station antenna. During the past twenty years or so a considerable amoun... View full abstract»

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  • 23. Application of efficient linear FM matched filtering algorithms to synthetic aperture radar processing

    Publication Year: 1985, Page(s):45 - 57
    Cited by:  Papers (42)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1716 KB)

    The applicability of two relatively new linear FM matched filtering algorithms to the processing of synthetic-aperture radar (SAR) data is examined and compared to the fast-convolution algorithm. The algorithms, called basic spectral analysis and the step transform, use the properties of the linear FM signal to achieve some significant performance improvements. The algorithms are evaluated on the ... View full abstract»

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  • 24. Intercept time and its prediction

    Publication Year: 1985, Page(s):215 - 220
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (927 KB)

    Intercept time is a key factor in the performance of electronic warfare (EW) surveillance and reconnaissance equipments. Interception relates to the probability of time coincidence of two or more parametric windows; scanning antennas, sweeping or stepping receivers and frequency-agile emitters give examples of such windows, where alignment or coincidence is required before detection can occur. For... View full abstract»

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  • 25. Jaguar-V frequency-hopping radio system

    Publication Year: 1982, Page(s):213 - 222
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1363 KB)

    The electronic threat to VHF tactical communications systems is reviewed, and possible counter-measures are discussed. The principles of the Jaguar-V frequency-hopping system are described, together with some aspects of the radio-system design and technical features of its implementation. Operational aspects of system performance are also discussed. View full abstract»

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  • 26. Performance of time-frequency coded spread spectrum systems operating over noisy fading channels

    Publication Year: 1988, Page(s):513 - 519
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (779 KB)

    The performance of time-frequency coded spread spectrum systems (TFCSSS) is considered when the systems are operating over noisy fading channels. Systems employing the random addressing technique of Viterbi [1] and the addressing scheme developed more recently by Einarsson [3] are examined. An exact expression is derived for the word-error probability associated with the Viterbi scheme. This expre... View full abstract»

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  • 27. Recursive estimation with uncertain observations in a multisensor environment

    Publication Year: 1986, Page(s):527 - 533
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (786 KB)

    There is increasing interest in simultaneously employing multiple sensors in surveillance and search systems. The paper treats the recursive estimation problem with uncertain observations when multiple sensors are used. Discrete-time results are obtained when the observations contain the signal to be estimated with probability one. These results are then extended to the case when the observations ... View full abstract»

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  • 28. Graph theory for image analysis: an approach based on the shortest spanning tree

    Publication Year: 1986, Page(s):146 - 152
    Cited by:  Papers (44)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1183 KB)

    The paper describes methods of image segmentation and edge detection based on graph-theoretic representations of images. The image is mapped onto a weighted graph and a spanning tree of this graph is used to describe regions or edges in the image. Edge detection is shown to be a dual problem to segmentation. A number of methods are developed, each providing a different segmentation or edge detecti... View full abstract»

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  • 29. Broadband crystal video front end for radar warning receivers

    Publication Year: 1982, Page(s):133 - 137
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (661 KB)

    The paper describes a broadband crystal video receiver, optimised for use in radar warning receivers with a direction-finding capability. The system design and the technologies adopted have been chosen to obtain a small, light and reliable line-replaceable unit that requires no particular adjustment to interface with other circuits. The receiver features a frequency-band-sorting capability to impr... View full abstract»

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  • 30. Log-Weibull distributed sea clutter

    Publication Year: 1980, Page(s):225 - 228
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (426 KB)

    Sea clutter was measured using and L-band long-range air-route surveillance radar (a.r.s.r.) at very low grazing angles between 0.13¿¿ and 0.25¿¿. From the stored data of six scans, it is shown that the sea-clutter amplitude statistics obey a log-Weibull distribution. View full abstract»

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  • 31. Design of the SPRT for radar target detection

    Publication Year: 1985, Page(s):139 - 148
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (943 KB)

    Sequential techniques for signal detection are becoming increasingly important in radar applications. In the paper the authors focus their attention on the sequential probability ratio test (SPRT), used for radar target detection. This test was proposed and analysed for the first time by Wald, who developed a method to approximately determine the performance of the SPRT. Unfortunately, this method... View full abstract»

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  • 32. Identification of unwanted scatterers on a free-field EMI test range

    Publication Year: 1983, Page(s):548 - 556
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (834 KB)

    CISPR publication 16 describes a simple test procedure for assessing the suitability of a site for the making of RFI measurements. The paper describes an improved test procedure which also enables those features of a site which are detrimental to its satisfactory performance to be identified positively. The new procedure has been utilised to assess the site for the proposed free-field EMI test ran... View full abstract»

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  • 33. Survey of radar data-processing techniques in air-traffic-control and surveillance systems

    Publication Year: 1980, Page(s):190 - 204
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2080 KB)

    The application of data-filtering techniques for air-traffic-control and surveillance systems is re-reviewed. Operational requirements of these systems are primarily described. They are typically composed of radars (mechanical scanning and phased array), data-processing devices (digital computers) and displays. The environment is determined by the number and characteristics of targets and by the d... View full abstract»

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  • 34. Performance analysis of GMSK frequency detection with decision feedback equalisation in digital land mobile radio

    Publication Year: 1988, Page(s):199 - 207
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (878 KB)

    The bit-error-rate (BER) performance of premodulation Gaussian filtered MSK (GMSK) using frequency detection (FD) in conjunction with 1 bit decision feedback equalisation (DFE) is theoretically investigated. The introduction of the premodulation filter causes severe intersymbol interference (ISI) in the waveform of the input to the FM modulator. DFE is used for reducing the ISI effect and therefor... View full abstract»

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  • 35. Figures of merit for VLSI implementations of digital signal processing algorithms

    Publication Year: 1984, Page(s):64 - 70
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (816 KB)

    The advent of digital VLSI technology demands a reappraisal of the most suitable algorithms for a given processing function. A cost function is developed for making quantitative comparisons between digital algorithm implementations including control and overheads. This provides a tool allowing different implementations of the same algorithm, and also different algorithms for the same function, to ... View full abstract»

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  • 36. Fifty years of bistatic and multistatic radar

    Publication Year: 1986, Page(s):596 - 603
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1262 KB)

    The article begins with a review of the history of bistatic and multistatic radars, including the simultaneous introduction of radar technology in several countries during the 1930s and the various areas of technology development pursued by those countries. Technical descriptions are presented of nine different experimental systems. The article continues with a discussion of the potential military... View full abstract»

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  • 37. AGC response and target glint

    Publication Year: 1981, Page(s):83 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (881 KB)

    Conventionally, radar trackers use fast or `instantaneous¿¿ automatic gain control (AGC) loops for control of IF gain. The paper indicates that this practice may result in unnecessarily large errors when the tracking accuracy is limited by target `glint¿¿ effects. The analysis considers a conical scan radar which is tracking a target consisting of two, point reflectors. Two limiting cases of AGC r... View full abstract»

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  • 38. Television-based bistatic radar

    Publication Year: 1986, Page(s):649 - 657
    Cited by:  Papers (78)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1311 KB)

    The paper discusses the use of `illuminators of opportunity¿¿ for bistatic radar systems. Experiments in the London area using the Crystal Palace transmitters are reported, including the use of TV pictures designed to make the transmission more closely resemble a pulsed radar signal. It is shown that the separation of targets from the direct signal and clutter requires extensive signal processing ... View full abstract»

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  • 39. Wideband characterisation of fading mobile radio channels

    Publication Year: 1982
    Cited by:  Papers (43)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1090 KB)

    A description of the physical mechanism causing multipath propagation in built-up areas is followed by a discussion of the various ways in which fading radio communiction channels can be described. It is shown that characterisation in the time-delay/Doppler-shift domain explicitly illustrates the multipath nature of the channel and provides parameters relevant to system design. A brief discussion ... View full abstract»

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  • 40. Signal sorting in ESM systems

    Publication Year: 1985, Page(s):226 - 228
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (402 KB)

    As radar signal environments become denser and radar signals become more complex, the task of an ESM operator becomes more difficult. In environments where the numbers of radars may be large and the number of pulses transmitted by a radar may be small, the operator becomes the dominating factor in the efficiency of an ESM system. The paper discusses the problem of developing automatic sorting of r... View full abstract»

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  • 41. Adaptivity and design criteria of a latest-generation MTD processor

    Publication Year: 1985, Page(s):58 - 65
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (875 KB)

    A latest-generation or `adaptive¿¿ moving target detector (A-MTD) digital processor is described. The A-MTD is based on three banks of filters, to cope with different levels of ground clutter. The paper includes: (i) the technique for the filter design, (ii) the trade-off for the number of bits to represent the filter coefficients (iii) some of the obtained filtering performances (iv) the analysis... View full abstract»

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  • 42. Introduction to subsurface radar

    Publication Year: 1988, Page(s):278 - 320
    Cited by:  Papers (34)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (8750 KB)

    Subsurface radar techniques are increasingly being used for the detection and location of buried artefacts and structures within the upper regions of the earth's surface. The paper reviews the work done to date in this field, laying emphasis on the range of applications and the need for system design to match the intended application. An overall design strategy is outlined, together with a more de... View full abstract»

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  • 43. Low sidelobe patterns from thinned arrays using multiplicative processing

    Publication Year: 1980
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (800 KB)

    The paper describes a new technique for achieving low-sidelobe directional patterns (¿¿35 dB) from thinned arrays. The concept employs multiplicative processing and is therefore restricted to receiving arrays. It is shown that a total of about 3N elements can synthesise a pattern corresponding to a filled array of N2 elements so that large thinning factors, in excess of 90%, are realisable for lar... View full abstract»

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  • 44. Application of the principle of dyadic symmetry to the generation of orthogonal transforms

    Publication Year: 1986, Page(s):264 - 270
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (707 KB)

    Two new transforms which can be used as substitutes for the Walsh transform are generated using the theory of dyadic symmetry. The new transforms have virtually the same complexity and computational requirements as the Walsh transform, employing additions, subtractions and binary shifts only, but have an efficiency, defined in terms of their ability to decorrelate signal data, which lies between t... View full abstract»

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  • 45. Adaptive frame synchroniser for digital satellite communication systems

    Publication Year: 1988, Page(s):51 - 59
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1089 KB)

    The paper presents an analysis of the error performance of a basic frame synchroniser when noise and timing uncertainties exist. The results yield criteria for a new window width and detection threshold strategy, and a new form of frame synchroniser for digital satellite communication systems is described. It is shown that false alarms and misdetections may be minimised using the adaptive window w... View full abstract»

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  • 46. Discussion of the finite-element modelling and performance of ring-shell projectors

    Publication Year: 1984, Page(s):275 - 279
    IEEE is not the copyright holder of this material | 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»

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  • 47. Consideration of the usefulness of microwave propagation prediction methods on air-to-ground paths

    Publication Year: 1983, Page(s):649 - 656
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1193 KB)

    Air-to-ground propagation paths are used by many microwave equipments such as sensors, counter-measures and communications. Prediction methods for the coverage of these equipments have been studied elsewhere using powerful numerical modelling techniques. A fundamental consideration is the availability of sufficient and accurate atmospheric data. A review of the possible measurement techniques is g... View full abstract»

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  • 48. Performance evaluation of convolutional codes with MPSK on Rician fading channels

    Publication Year: 1987, Page(s):166 - 173
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (860 KB)

    It is known that convolutional coding and Viterbi decoding together with high-level modulation can provide error-control protection without sacrificing bandwidth efficiency on additive white Gaussian noise (AWGN) channels. Bearing this in mind, the paper is concerned with the performance of short constraint length convolutional codes in conjunction with M-ary phase-shift-keyed modulation and maxim... View full abstract»

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  • 49. Zero-crossing-based approximate demodulation of wide-deviation FM

    Publication Year: 1984, Page(s):47 - 51
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A zero-crossing-based approximate realtime demodulator is described. Output digital samples, generated through linear interpolation of a suitably approximated piecewise linear model of the modulating signal, are passed through an usual reconstruction filter to recover the original modulating signal. Details of a simple microprocessor-based implementation of the demodulator are presented along with... View full abstract»

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  • 50. Low-data-rate visual communication using cartoons: a comparison of data compression techniques

    Publication Year: 1986, Page(s):236 - 256
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5818 KB)

    An analysis of two-level picture compression techniques applied to low-resolution moving images is reported. The object is to discover the most suitable technique for visual communication at low data rates using feature-extracted `cartoons¿¿. Reversible facsimile compression techniques are reviewed, then results presented to demonstrate their relative performance. In general, three-dimensional tec... View full abstract»

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Aims & Scope

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

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