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  • Articles  (32,289)
  • Springer  (32,289)
  • Nature Publishing Group
  • 2020-2023
  • 2005-2009  (9,963)
  • 2000-2004  (6,756)
  • 1985-1989  (7,530)
  • 1975-1979  (8,040)
  • Electrical Engineering, Measurement and Control Technology  (18,420)
  • Architecture, Civil Engineering, Surveying  (13,869)
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  • Articles  (32,289)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetostatic wave devices for UHF band applications (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 285-300 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Magnetostatic surface wave (MSSW) devices made with pure and gallium-substituted yttrium-iron garnet (Ga:La-YIG) films are described. These devices include nondispersive and dispersive delay lines, band-pass filters, oscillators, and resonators. By controlling the magnitude of the bias magnetic field and the temperature of operation, it is possible to tune these devices over a wide frequency range extending from 0.3 to 4 GHz and from 3 to 18 GHz using Ga:La-YIG and pure YIG films, respectively. These devices could be used in pulse compression radar, microscan receivers, complicated Fourier transform processors, and fundamental oscillator circuits. In this paper, we briefly show results for pure YIG devices tunable in C and X bands and discuss, in detail, the performance of the Ga:La-YIG devices for UHF applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600086
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  • 2
    Electronic Resource
    Electronic Resource
    MSW devices for EW receiver applications (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 301-316 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Conclusion Significant improvements are required in the performance of MSW dispersive delay lines and filter banks before they are ready for systems application. Typically delay lines with bandwidths of 1 GHz or greater, differential delays in the range 200 ns to 1μs, and minimum phase errors (〈±1 °) are required for large (∿40 dB) dynamic range compressive receivers. However, techniques are evolving (see rest of this issue) in this relatively new area of technology which will allow systems performance requirements on phase errors to be met. Possible approaches to low phase error dispersive delay lines include reflective arrays, stepped ground planes, and multiple YIG films. The stepped ground plane technique is the most advanced and uses an optimization approach to the delay-line design, which results in a minimum phase error [20]. Ultimately the minimum achievable phase error will be limited by reflections from transducers and multiple mode effects in the delay lines. The MSW compressive receiver requires parallel advances in high-speed digital processing techniques to achieve its full potential. The MSW filter bank provides a simple channelization technique applicable up to approximately 20 GHz. Narrowband channels with 10 dB insertion loss, 3 dB bandwidths of 10 to 40 MHz, and 50 dB bandwidths of 30 to 120 MHz are possible with the already demonstrated techniques. Broader bandwidth channels in the range 50 to 200 MHz with flat passband response require improved transducer design techniques. The channelized receiver does not require extremely high-speed operations but, since a large number of channels are involved, size and cost become very significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600087
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  • 3
    Electronic Resource
    Electronic Resource
    On the mechanism of transient instability of power systems (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 413-434 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In recent studies, it has been verifiedheuristically andexperimentally (via simulations) that instability in power systems due to a fault occurs when one machine or a group of machines, called thecritical group, loses synchronism with the remaining machines. Using energy functions associated with a critical group (rather than system-wide functions), transient stability results which are less conservative than other existing results, have been obtained. The existence and identity of a critical group is ascertained in these studies byoff-line simulations. In this paper, we present results, for power systems with uniform damping, which establishanalytically theexistence and theidentity of the critical group of machines due to a given fault. We also present a result to determine estimates of the domain of attraction of asymptotically stable equilibrium points in power systems. The results presented herein can potentially be usedon-line to determine which machines belong to a critical group, and to use this information for corrective action (e.g.,shedding of the critical generators orfast valving for these generators). The applicability of the present results is demonstrated by means of a specific example (a 162-bus, 17-generator model of the power network of the State of Iowa).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605428
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  • 4
    Electronic Resource
    Electronic Resource
    A survey of linear singular systems (1986)
    Springer
    Circuits, systems and signal processing 5 (1986), S. 3-36 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper is a brief historical review of linear singular systems, followed by a survey of results on their solution and properties. The frequency domain and time domain approaches are discussed together to sketch an overall picture of the current status of the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600184
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  • 5
    Electronic Resource
    Electronic Resource
    The recovery of distorted bandlimited almost-periodic signals (2000)
    Springer
    Circuits, systems and signal processing 19 (2000), S. 385-398 
    Details
    ISSN: 1531-5878
    Keywords: Recovery of distorted signals ; almost periodic signals ; bandlimited signals ; nonlinear systems ; nonlinear distortion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract It is shown that thePQ theorem can be used to solve a certain signal recovery problem in which the transmitted and received signals are almost periodic functions. In this problem the signal to be recovered, which is bandlimited, is nonlinearly distorted and then bandlimited to the original band. Related signal recovery results are also given. These related results, unlike thePQ theorem, are applicable in settings in which the underlying signal space is not a Hilbert space or even a space that is complete.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196153
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  • 6
    Electronic Resource
    Electronic Resource
    Minimal realization for lifted periodic filters (2000)
    Springer
    Circuits, systems and signal processing 19 (2000), S. 411-421 
    Details
    ISSN: 1531-5878
    Keywords: Periodic filters ; lifted model ; minimal realization ; reachability ; observability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Practical applications in signals and systems often deal with lifted models of periodic digital filters, to which well-known methods and computing software for linear time-invariant (LTI) systems can be applied in the analysis and synthesis of periodic filters. When the design of a periodic filter is based on the lifted model, the resultant filter is usually in the lifted LTI form and needs to be further converted into the periodic form for implementational and computational purposes. In this paper, we present a computational procedure for obtaining a minimal realization of periodic digital filters from the fifted model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196155
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  • 7
    Electronic Resource
    Electronic Resource
    Robust mixed-order root-music (2000)
    Springer
    Circuits, systems and signal processing 19 (2000), S. 451-466 
    Details
    ISSN: 1531-5878
    Keywords: Direction finding ; high-order statistics ; root-MUSIC ; robustness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Several typical situations unfavorable for second-order direction-finding methods are known to be easily overcome by means of higher-order techniques. In turn, in typical situations unfavorable for higher-order methods, second-order algorithms often perform quite well. Therefore, appropriately combining covariance- and cumulant-based techniques into one scheme, it is possible to obtain an algorithm with an improved robustness. In this paper, we propose two modifications of such combined methods, referred to asmixed-order root-MUSIC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196158
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  • 8
    Electronic Resource
    Electronic Resource
    Arma spectral estimation based on partial autocorrelations — Part II: Statistical analysis (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 367-383 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In a previous paper [1], a new algorithm for ARMA spectral estimation of stationary time series has been presented. The algorithm is based on nonlinear least squares fit of the sample partial autocorrelations to the partial autocorrelations generated by the assumed ARMA model. This paper explores the statistical properties of the above algorithm, including some numerical examples of the asymptotic variance of the estimated parameters, as compared to the Cramer-Rao bound. The results confirm the good performance of the algorithm and suggest an improvement in its implementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605426
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  • 9
    Electronic Resource
    Electronic Resource
    MSW applications for phased array antennas (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 335-350 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A potential application of MSW technology lies in the area of time delay for future low-sidelobe wide-bandwidth phased array antennas. High-precision MSW electronically tunable analog time-delay units in transmit/receive modules in phased arrays have the potential of greatly enhancing antenna system capabilities, by increasing instantaneous operating bandwidth and decreasing sidelobe levels, over phased array systems using only phase shifters or switched lines for beam steering and control. This paper provides a status report of MSW time delays for such arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600089
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  • 10
    Electronic Resource
    Electronic Resource
    The decimation-in-frequency algorithms for a family of discrete sine and cosine transforms (1988)
    Springer
    Circuits, systems and signal processing 7 (1988), S. 3-19 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper we present results in the development of decimation-in-frequency algorithms for a family of discrete sine and cosine transforms. They are closely related to the decimation-in-time algorithms developed by Yip and Rao [1]. The complexity of the algorithms was examined through the number of multiplications and additions as well as the number of different constants required in the transforms. It was found that the decimation-in-frequency approach provides a viable alternative to other fast algorithms for the discrete sine and cosine transforms. In particular, the recursive and modular structure of the algorithms lends itself readily to possible hardware realization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600005
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