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Communications, Radar and Signal Processing, IEE Proceedings F

Issue 5 • Date October 1981

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Displaying Results 1 - 12 of 12
  • Improvements in use of congested spectrum for land mobile radio service by adoption of bandsharing spread-spectrum system with TV broadcast channels

    Publication Year: 1981, Page(s):245 - 260
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2337 KB)

    The paper examines the possibility of private mobile radio users sharing the RF spectrum with the television broadcast channels on a mutual noninterference basis, with the aim of accommodating greater spectrum efficiency. A comparison is made between the use of conventional narrowband modulation methods, such as AM, FM and SSB, and the broadband direct-sequence spread-spectrum modulation schemes a... View full abstract»

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  • Virtual polarisation adaptation a method of increasing the detection capability of a radar system through polarisation-vector processing

    Publication Year: 1981, Page(s):261 - 270
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1351 KB)

    The ratio of the average target-signal power to the average unwanted-signal power at the input of a radar detection receiver can be significantly increased by applying the method of clutter/interference suppression described in the paper. The polarisation state of the emissions, the object-backscatter field, and the interference field are all taken into account in a technique referred to as `virtu... View full abstract»

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  • Fast converging stochastic gradient algorithm

    Publication Year: 1981, Page(s):271 - 274
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    A new scheme for the adjustment of adaptive equaliser tap gains is developed. In the scheme the short-term averages of the stochastic gradients are used to reduce the self-noise arising from the application of noisy gradient estimates. The new algorithm permits the application of larger step sizes, and therefore results in faster convergence. Some theoretical results are presented and compared wit... View full abstract»

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  • Ground-wave propagation. Part 1: Theory for short distances

    Publication Year: 1981, Page(s):275 - 284
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    Ground-wave propagation over a curved earth with a troposphere whose refractive index varies with height is considered. Series expansions are derived whose first term is the Sommerfeld flat-earth formula. These expansions generalise previous results by the inclusion of the effects of the inhomogeneous refractive-index variation. The methods described are induded in the ground-wave-propagation prog... View full abstract»

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  • Ground-wave propagation. Part 2: Theory for medium and long distances and reference propagation curves

    Publication Year: 1981, Page(s):285 - 295
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1033 KB)

    Ground-wave propagation over a curved earth with a troposphere whose refractive index varies with height is considered with application to the CCIR reference exponential atmosphere. The residue-series and geometrical-optics methods are described. A ground-wave-propagation program GRWAVE has been written, and new propagation curves for frequencies from 10kHz to 30MHz are given. An interpretation in... View full abstract»

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  • Adaptive mean-square-error transversal equaliser

    Publication Year: 1981, Page(s):296 - 304
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1005 KB)

    A new adaptive equaliser for the minimisation of mean-square error has been developed for use over a wide range of transmission channels. The equaliser comprises a transversal filter (with variable tap gains) and a processor. Using the processor, the tap-gain-adjustment information is derived from blocks of samples taken from the channel output. The processor operates independently of the channel ... View full abstract»

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  • Sequential radar detection of border penetration

    Publication Year: 1981, Page(s):305 - 310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (739 KB)

    Sequential and unsequential algorithms for the radar detection of border penetration are investigated. Operating characteristics and energy requirements are determined for both algorithms. The sequential approach is shown to provide a substantial reduction in energy requirements in comparison with the unsequential approach. This improvement depends on the position of the target and the required qu... View full abstract»

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  • Signal processing for target detection in experimental phased-array radar ELRA

    Publication Year: 1981, Page(s):311 - 316
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    The concept and some experimental results of the phased-array system ELRA are presented, with emphasis on signal processing for target search. Multiple beams together with a variable number of pulses in each beam position are used for sequential detection and also for search in clutter by applying a recursive filter against stationary target echoes. New considerations concerning the practical appl... View full abstract»

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  • Analysis of response of FM mobile receiver in quasisynchronous field

    Publication Year: 1981, Page(s):317 - 322
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (732 KB)

    Frequency-modulated quasisynchronous (QS) mobile radio systems are of benefit to PMR users already committed to FM in the solution of radio coverage problems. The paper analyses the performance of a conventional FM receiver in the overlap area of two QS transmitters and gives graphs quantifying this performance as a function of system parameters. The paper suggests design criteria for a practical ... View full abstract»

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  • Computer aids for code spectra calculations

    Publication Year: 1981, Page(s):323 - 330
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (744 KB)

    A suite of computer programs has been developed to calculate the power spectral density of a wide range of transmission codes. Suitable user interfaces are provided for the automatic construction of the state diagram, the encode function and the codework matrices. The output includes the attractive analytical formula in closed-cosine form, the autocorrelation function and plots, in colour, for Dir... View full abstract»

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  • 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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  • Book review: Digital Signal Processing

    Publication Year: 1981
    IEEE is not the copyright holder of this material | PDF file iconPDF (123 KB)
    Freely Available from IEEE

Aims & Scope

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

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