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Publications of year 1987
Articles in journal or book chapters

Jan Askne and H. Nordius.
Estimation of tropospheric delay for microwaves from surface weather data.
Radio Science,
22(3):379386,
1987.
Abstract: 
We have developed two methods to determine the tropospheric path delay for microwaves. One uses a closed form model of the atmosphere in which two parameters are used to describe the decrease in temperature with height and the relation between total pressure and water vapor partial pressure, respectively. The other method uses numerical integration of refractivity profiles, which are computed from temperature and humidity profiles obtained by statistical regression. The two methods have been tested on two sets of observations and compared with simultaneous radio soundings. The best results show an improvement of 10\% in one case and 30\% in the other compared with a presently used model. Possibilities to improve the statistical model further are discussed. 
@Article{askneNordiusRadioScience1987TroposphericDelayForMicrowaves,
author = {Askne, Jan and Nordius, H.},
journal = {Radio Science},
title = {Estimation of tropospheric delay for microwaves from surface weather data},
year = {1987},
number = {3},
pages = {379386},
volume = {22},
abstract = {We have developed two methods to determine the tropospheric path delay for microwaves. One uses a closed form model of the atmosphere in which two parameters are used to describe the decrease in temperature with height and the relation between total pressure and water vapor partial pressure, respectively. The other method uses numerical integration of refractivity profiles, which are computed from temperature and humidity profiles obtained by statistical regression. The two methods have been tested on two sets of observations and compared with simultaneous radio soundings. The best results show an improvement of 10\% in one case and 30\% in the other compared with a presently used model. Possibilities to improve the statistical model further are discussed.},
doi = {10.1029/RS022i003p00379},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/RS022i003p00379},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/RS022i003p00379},
}

M. Borgeaud,
R.T. Shin,
and J.A. Kong.
Theoretical Models For Polarimetric Radar Clutter.
Journal of Electromagnetic Waves and Applications,
1(1):7389,
1987.
Abstract: 
The Mueller matrix and polarization covariance matrix are described for polarimetric radar systems. The clutter is modelled by a layer of random permittivity, described by a threedimensional correlation function, with variance, and horizontal and vertical correlation lengths. This model is applied, using the wave theory with Born approximations carried to the second order, to find the backscattering elements of the polarimetric matrices. It is found that 8 out of 16 elements of the Mueller matrix are identically zero, corresponding to a covariance matrix with four zero elements. Theoretical predictions are matched with experimental data for vegetation fields. 
@Article{borgeaudShinKong1987,
author = {Borgeaud, M. and Shin, R.T. and Kong, J.A.},
title = {Theoretical Models For Polarimetric Radar Clutter},
journal = {Journal of Electromagnetic Waves and Applications},
year = {1987},
volume = {1},
number = {1},
pages = {7389},
abstract = {The Mueller matrix and polarization covariance matrix are described for polarimetric radar systems. The clutter is modelled by a layer of random permittivity, described by a threedimensional correlation function, with variance, and horizontal and vertical correlation lengths. This model is applied, using the wave theory with Born approximations carried to the second order, to find the backscattering elements of the polarimetric matrices. It is found that 8 out of 16 elements of the Mueller matrix are identically zero, corresponding to a covariance matrix with four zero elements. Theoretical predictions are matched with experimental data for vegetation fields.},
doi = {doi:10.1163/156939387X00108},
file = {:borgeaudShinKong1987.pdf:PDF},
pdf = {../../../docs/borgeaudShinKong1987.pdf},
url = {http://www.ingentaconnect.com/content/vsp/jew/1987/00000001/00000001/art00004},
}

Hans Hellsten and Lars E. Andersson.
An inverse method for the processing of synthetic aperture radar data.
Inverse Problems,
3(1):111124,
1987.
Keyword(s): SAR Processing,
BackProjection,
Hankel Transform,
FourierHankel Inversion,
Abel Transform.
Abstract: 
An inverse method for the processing of synthetic aperture radar signals is presented. The method is independent of the relative bandwidth of the radar signal and should thus work when, for instance, the frequency of the emitted radiation is of the same order as the bandwidth, i.e. in low frequency, high resolution applications. It is shown that the obtained relations reduce to the correlation integrals of conventional SAR image processing in the case that the relative bandwidth of the signal is small. Range attenuation and antenna illumination effects may be fully compensated for. 
@Article{hellstenAndersson87:Backprojection,
Title = {An inverse method for the processing of synthetic aperture radar data},
Author = {Hans Hellsten and Lars E. Andersson},
Number = {1},
Pages = {111124},
Url = {http://stacks.iop.org/02665611/3/111},
Volume = {3},
Year = {1987},
Abstract = {An inverse method for the processing of synthetic aperture radar signals is presented. The method is independent of the relative bandwidth of the radar signal and should thus work when, for instance, the frequency of the emitted radiation is of the same order as the bandwidth, i.e. in low frequency, high resolution applications. It is shown that the obtained relations reduce to the correlation integrals of conventional SAR image processing in the case that the relative bandwidth of the signal is small. Range attenuation and antenna illumination effects may be fully compensated for.},
Journal = {Inverse Problems},
Keywords = {SAR Processing, BackProjection, Hankel Transform, FourierHankel Inversion, Abel Transform},
Owner = {ofrey},
Pdf = {../../../docs/hellstenAndersson87.pdf}
}

Christian Matzler.
Applications of the interaction of microwaves with the natural snow cover.
Remote sensing reviews,
2(2):259387,
1987.
@Article{Maetzler1987,
author = {Matzler, Christian},
title = {Applications of the interaction of microwaves with the natural snow cover},
journal = {Remote sensing reviews},
year = {1987},
volume = {2},
number = {2},
pages = {259387},
owner = {ofrey},
publisher = {Taylor \& Francis},
}

Christian Matzler and Urs Wegmuller.
Dielectric properties of freshwater ice at microwave frequencies.
Journal of Physics D: Applied Physics,
20(12):1623,
1987.
Abstract: 
So far, knowledge about the dielectric properties, especially the loss factor, of ice at microwave frequencies has been unsatisfactory. In this work the authors report on new measurements made over the frequency range from 2 to 100 GHz by a resonator method (210 GHz) and a radiometer method (10100 GHz). Measurements were made with pure and with slightly saline (10 to 13 p.p.m.) ice. The results agree with the assumption of a single minimum of the dielectric loss at 2 to 4 GHz. For pure ice the data are a natural link between the measurements of Westphal made below 1 GHz and the farinfrared spectrum. The influence of small impurities on the dielectric loss is compared with the behaviour of sea ice, and it is found that the same linear relationship with salinity can be applied to both cases. 
@Article{matzlerWegmuller1987,
author = {Matzler, Christian and Wegmuller, Urs},
title = {Dielectric properties of freshwater ice at microwave frequencies},
journal = {Journal of Physics D: Applied Physics},
year = {1987},
volume = {20},
number = {12},
pages = {1623},
url = {http://stacks.iop.org/00223727/20/i=12/a=013},
abstract = {So far, knowledge about the dielectric properties, especially the loss factor, of ice at microwave frequencies has been unsatisfactory. In this work the authors report on new measurements made over the frequency range from 2 to 100 GHz by a resonator method (210 GHz) and a radiometer method (10100 GHz). Measurements were made with pure and with slightly saline (10 to 13 p.p.m.) ice. The results agree with the assumption of a single minimum of the dielectric loss at 2 to 4 GHz. For pure ice the data are a natural link between the measurements of Westphal made below 1 GHz and the farinfrared spectrum. The influence of small impurities on the dielectric loss is compared with the behaviour of sea ice, and it is found that the same linear relationship with salinity can be applied to both cases.},
owner = {ofrey},
}

Fabio Rocca.
Synthetic Aperture Radar: a New Application for Wave Equation Techniques.
Stanford Exploration Project SEP56,
pp 167189,
1987.
Keyword(s): SAR Processing,
Range Migration Algorithm,
omegak,
Wavenumber Domain Algorithm,
Seismic Migration Techniques.
Abstract: 
The techniques of downward continuation and imaging invented for seismic waves can be applied to other types of waves. In this paper, we see how this application can be made in the case of electromagnetic surveys conducted with Synthetic Aperture Radar (SAR). The algorithms used closely follow those used for seismic waves. Differences are induced by alternate wavelengths, wave velocities, distances between sources and reflectors etc. In the case that we analyze in detail, a survey carried out using a satellite, difficulties arise from the fact that the orbit of the satellite cannot be approximated with a simple straight line if the spatial resolution of the survey is high. We determine appropriate techniques for the correction of the distortion induced by the latter and we delimit the resolution of the observed data, as seen from a satellite. Finally we show examples of the application of the technique of seismic migration to satellite data that were irradiated to earth during the short but productive life of SEASAT. 
@Article{rocca87:SAR,
Title = {{Synthetic Aperture Radar: a New Application for Wave Equation Techniques}},
Author = {Fabio Rocca},
Pages = {167189},
Url = {http://sepwww.stanford.edu/oldreports/sep56/56_13.pdf},
Year = {1987},
Abstract = {The techniques of downward continuation and imaging invented for seismic waves can be applied to other types of waves. In this paper, we see how this application can be made in the case of electromagnetic surveys conducted with Synthetic Aperture Radar (SAR). The algorithms used closely follow those used for seismic waves. Differences are induced by alternate wavelengths, wave velocities, distances between sources and reflectors etc. In the case that we analyze in detail, a survey carried out using a satellite, difficulties arise from the fact that the orbit of the satellite cannot be approximated with a simple straight line if the spatial resolution of the survey is high. We determine appropriate techniques for the correction of the distortion induced by the latter and we delimit the resolution of the observed data, as seen from a satellite. Finally we show examples of the application of the technique of seismic migration to satellite data that were irradiated to earth during the short but productive life of SEASAT.},
Journal = {Stanford Exploration Project SEP56},
Keywords = {SAR Processing, Range Migration Algorithm, omegak, Wavenumber Domain Algorithm, Seismic Migration Techniques},
Pdf = {../../../docs/rocca87.pdf}
}

Einar Svendsen,
Christian Matzler,
and Thomas C Grenfell.
A model for retrieving total sea ice concentration from a spaceborne dualpolarized passive microwave instrument operating near 90 GHz.
International Journal of Remote Sensing,
8(10):14791487,
1987.
@Article{Svendsen1987,
author = {Svendsen, Einar and Matzler, Christian and Grenfell, Thomas C},
title = {A model for retrieving total sea ice concentration from a spaceborne dualpolarized passive microwave instrument operating near 90 GHz},
journal = {International Journal of Remote Sensing},
year = {1987},
volume = {8},
number = {10},
pages = {14791487},
owner = {ofrey},
publisher = {Taylor \& Francis},
}
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This collection of SAR literature is far from being complete. It is rather a collection of papers which I store in my literature data base. Hence, the list of publications under PUBLICATIONS OF AUTHOR'S NAME
should NOT be mistaken for a complete bibliography of that author.
Last modified: Mon Feb 1 16:39:00 2021
Author: Othmar Frey, Earth Observation and Remote Sensing, Institute of Environmental Engineering, Swiss Federal Institute of Technology  ETH Zurich .
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