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Proceedings of the IEEE

Issue 3 • Mar 1994

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Displaying Results 1 - 8 of 8
  • Ground-based remote profiling in atmospheric studies: an overview

    Publication Year: 1994, Page(s):313 - 355
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3964 KB)

    Over the last 25 years, ground-based remote profiling has found increasing applications in atmospheric studies where its high vertical and temporal resolution and extended vertical coverage are giving scientists a clearer understanding of atmospheric processes in the troposphere. The authors describe the current status of techniques for vertical profiling of mean wind speeds, temperature, and humi... View full abstract»

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  • Basefield transforms with the convolution property

    Publication Year: 1994, Page(s):400 - 412
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    We present a general framework for constructing transforms in the field of the input which have a convolution-like property. The construction is carried out over the reals, but is shown to be valid over more general fields. We show that these basefield transforms can be viewed as “projections” of the discrete Fourier transform (DFT). Furthermore, by imposing an additional condition on ... View full abstract»

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  • Affine theorem for the Hartley transform of an image

    Publication Year: 1994, Page(s):388 - 390
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Many well-known theorems for the two-dimensional (2D) Hartley transform are encapsulated in the affine theorem which is presented here and illustrated by example. The mode of presentation permits ready visualization of the effect on the spectral makeup when an object is subjected to a particular distortion as specified by the six disposable parameters of the affine coordinate transformation and of... View full abstract»

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  • Antenna pattern synthesis: a new general approach

    Publication Year: 1994, Page(s):358 - 371
    Cited by:  Papers (126)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1204 KB)

    The antenna pattern synthesis problem is of the utmost importance in almost every kind of antenna applications. Therefore, a very large number of contributions have appeared on this subject. But virtually all of them deal with simplified versions of the complete synthesis problem, wherein the degrees of freedom available in principle are strongly reduced, and/or idealized design criteria or requir... View full abstract»

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  • Analytic properties of the Hartley transform and their implications

    Publication Year: 1994, Page(s):413 - 428
    Cited by:  Papers (20)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1280 KB)

    The Hartley transform is an integral transform closely related to the Fourier transform. It has some advantages over the Fourier transform in the analysis of real signals as it avoids the use of complex arithmetic. However, the Hartley transform has other applications in signal and image reconstruction related to traditional phase retrieval problems. These can he understood by examining the analyt... View full abstract»

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  • Optical Hartley transforms

    Publication Year: 1994, Page(s):391 - 399
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    The two-dimensional Hartley transform is of particular interest not only as a tool for analysis and processing of images and other two-dimensional functions, but because it can be implemented optically without introducing the phase ambiguities associated with intensity-only observations of Fourier transforms. The Hartley transform property of producing real transforms from real inputs means that s... View full abstract»

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  • Aspects of the Hartley transform

    Publication Year: 1994, Page(s):381 - 387
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    Known in the signal processing literature mainly as a computational technique, the Hartley transform has proven to possess attributes in the physical world of experiment, especially in optics and microwaves. The Fourier transform, which has constituted the standard approach to spectral analysis, is understood both in the domain of numerical analysis and in the world of natural phenomena, gaining i... View full abstract»

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  • A comparative review of real and complex Fourier-related transforms

    Publication Year: 1994, Page(s):429 - 447
    Cited by:  Papers (21)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    Major continuous-time, discrete-time, and discrete Fourier-related transforms as well as Fourier-related series are discussed both with real and complex kernels. The complex Fourier transforms, Fourier series, cosine, sine, Hartley, Mellin, Laplace transforms, and z-transforms are covered on a comparative basis. Generalizations of the Fourier transform kernel lead to a number of novel transforms, ... View full abstract»

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North Carolina State University