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Geoscience and Remote Sensing, IEEE Transactions on

Issue 4 • Date Jul 1989

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Displaying Results 1 - 15 of 15
  • Consideration of vertical resolution for near nadir-looking spaceborne radar

    Publication Year: 1989 , Page(s): 354 - 357
    Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB)  

    A definition of the effective vertical resolution for a down-looking rain radar is proposed on the basis of a general consideration of radar resolution in which the radar resolution for an arbitrary direction is determined by an average radar response function. Calculations of the vertical resolution are made for typical spaceborne radar parameters. The results can be applied to improving the accu... View full abstract»

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  • Self-consistency aspects of dielectric mixing theories

    Publication Year: 1989 , Page(s): 403 - 415
    Cited by:  Papers (31)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (964 KB)  

    Dielectric mixing formulas that relate the effective permittivity of a heterogeneous medium with the properties of the constituent materials are considered. The restriction for this approach is that the sizes of the inclusions in the mixture have to be considerably smaller than the wavelength to avoid scattering effects. The mixing rules are presented for cases where the scatterers can be homogene... View full abstract»

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  • Block adaptive quantization of Magellan SAR data

    Publication Year: 1989 , Page(s): 375 - 383
    Cited by:  Papers (84)  |  Patents (10)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1076 KB)  

    A report is presented on a data compression scheme that will be used to reduce the SAR (synthetic-aperture radar) data rate on the US NASA Magellan (MGN) mission to Venus. The MGN spacecraft has only one scientific instrument, namely, a radar system that is used for imaging the surface. for altimetric profiling of the planet topography, and for measuring radiation of the planet surface. A straight... View full abstract»

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  • Wavelet parameter and phase estimation using cumulant slices

    Publication Year: 1989 , Page(s): 452 - 455
    Cited by:  Papers (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (372 KB)  

    A simple, closed-form expression relates one-dimensional output cumulant statistics with the parameters of a known-order moving-average wavelet. Based on this relationship the author obtains unique parameter and phase estimates of autoregressive moving-average seismic wavelets. The input reflectivity sequence is assumed to be non-Gaussian, independent, and identically distributed. The wavelet is n... View full abstract»

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  • A general solution of the electrode resistance problem

    Publication Year: 1989 , Page(s): 455 - 459
    Request Permissions | Click to expandAbstract | PDF file iconPDF (416 KB)  

    Starting from the stationary current field problem of a three-axial ellipsoid, the solution of the electric potential is known. This solution and the results of earlier papers are used to calculate the electrode resistances. The main advantage of this method is that it contains the calculation steps not only for electrodes developed by three-axial ellipsoids but also for other electrode forms; e.g... View full abstract»

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  • A scale model for studying ground penetrating radars

    Publication Year: 1989 , Page(s): 358 - 363
    Cited by:  Papers (18)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (436 KB)  

    A scale model developed for experimentally studying ground penetrating radars is described. The model is one-third full size and is used with transient signals that have significant frequency content within the range 150 MHz to 1.5 GHz. A unique feature is that the soil in the model is represented by an emulsion, which is mixture of mineral oil, saline solution, and a stabilizing agent. This emuls... View full abstract»

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  • The structure of red-infrared scattergrams of semivegetated landscapes

    Publication Year: 1989 , Page(s): 441 - 451
    Cited by:  Papers (14)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1024 KB)  

    A physically based linear stochastic geometric canopy-soil reflectance model is presented for characterizing spatial variability of semivegetated landscapers at subpixel and regional scales. Landscapes are conceptualized as stochastic geometric surfaces, incorporating not only the variability in geometric elements but also the variability in vegetation and soil background reflectance, which can be... View full abstract»

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  • Transient electromagnetic response of a permeable and conducting ground to a linear current ramp switch-off

    Publication Year: 1989 , Page(s): 428 - 432
    Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    The asymptotic representation for late times of the transient electric field above and on a uniform permeable and conducting ground is derived with the hitherto untreated effects of a ramp switch-off source current. The source is a vertically oriented finite loop placed on the ground. Certain response functions are defined and the results are compared directly to those of a Heaviside switch-off. T... View full abstract»

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  • Polarization utilization in the microwave inversion of leaf angle distributions

    Publication Year: 1989 , Page(s): 395 - 402
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (692 KB)  

    The inverse problem of deducting the inclination angle distribution of leafy vegetation has been investigated using L-band multipolarization backscattered data. The modeling procedure replaces canopy leaves with thin circular dielectric disks. The Born approximation is then used to establish a linear relationship between the radar backscattering coefficients and the leaf inclination angle... View full abstract»

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  • The E-parallel polarization response of a two-dimensional heterogeneous layer modeled by two thin sheets

    Publication Year: 1989 , Page(s): 369 - 374
    Request Permissions | Click to expandAbstract | PDF file iconPDF (460 KB)  

    The flexibility of the thin-sheet technique for modeling two-dimensional structures is extended by analyzing the response to E-parallel to the strike of the anomaly polarization, also known as the transverse electric (TE) mode, when a heterogeneous Earth is modeled by two thin sheets over a horizontally stratified half-space. The electromagnetic fields induced by the heterogeneous layer w... View full abstract»

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  • The RADTRAN microwave surface emission models

    Publication Year: 1989 , Page(s): 433 - 440
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (680 KB)  

    The AFGL RADTRAN microwave atmospheric transmission/brightness temperature computer code has been enhanced by a surface emissivity modeling subpackage. This enhancement will provide realistic calculations of frequency-dependent polarized surface emissivity to support simulations of Earth-viewing microwave sensing systems. These models are appropriate for the frequency range 1-40 GHz. Two distinct ... View full abstract»

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  • A statistical approach for determining radiometric precisions and accuracies in the calibration of synthetic aperture radar imagery

    Publication Year: 1989 , Page(s): 416 - 427
    Cited by:  Papers (15)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1044 KB)  

    A model that estimates a relative error bound for the radiometric calibration of synthetic aperture radar (SAR) imagery is presented. This model is based on a statistical `Coefficient of Variation of Error Model', which produces a relative error bound by propagating the measured or estimated uncertainties in the radar system parameters utilized to correct digitally processed SAR image intensity va... View full abstract»

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  • Near-field detection of buried dielectric objects

    Publication Year: 1989 , Page(s): 364 - 368
    Cited by:  Papers (9)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    The plane-wave scattering-matrix method is used to compute the response of a detector to a buried dielectric scatterer. The Born approximation is used to derive the scattering matrix for scatterers of small dielectric contrast, but the general theory is not limited to such cases. Specific numerical results are generated for a UHF dipole detector swept over a buried dielectric cube. The maximum res... View full abstract»

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  • Ground network optimization using satellite information: application to the French heliographic network

    Publication Year: 1989 , Page(s): 459 - 462
    Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    The authors deal with the setting up of sunshine recording stations using satellite information. Most statistical criteria used to select measurement locations rely on knowledge of the correlation structure of the measured phenomenon. As this structure is generally not known extensively, it must be modeled under homogeneity assumptions. An alternative solution is proposed to avoid such modeling by... View full abstract»

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  • Recursive deconvolution of Bernoulli-Gaussian processes using a MA representation

    Publication Year: 1989 , Page(s): 384 - 394
    Cited by:  Papers (13)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (956 KB)  

    The authors deal with the problem of deconvolution of Bernoulli-Gaussian random processes observed through linear systems. This corresponds to situations frequently encountered in areas such as geophysics, ultrasonic imaging, and nondestructive evaluation. Deconvolution of such signals is a detection-estimation problem that does not allow purely linear data processing, and the nature of the diffic... View full abstract»

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Aims & Scope

 

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING (TGRS) is a monthly publication that focuses on the theory, concepts, and techniques of science and engineering as applied to sensing the land, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.

 

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Meet Our Editors

Editor-in-Chief
Antonio J. Plaza
University of Extremadura