Engineering topics
Publications and source records attributed to Madsen, S..
This paper discusses the challenges of placing Transmit/Receive (T/R) modules on a membrane array to achieve an active phased array.
The efforts described in this paper are part of a three-year on-going task sponsored by the NASA Earth Science Technology Office (ESTO) under the Advanced Component Technology (ACT) program. We will describe the current status and recent results of a novel T/R module technology to achieve ultra-high efficiencies.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
GeoSAR is a program to develop a dual frequency airborne radar interferometric mapping instrument designed to meet the mapping needs of a variety of users in government and private industry.
This paper describes an algorithm that combines wavenumber domain processing with a procedure that enables motion compensation to be applied as a function of target range and azimuth angle. First, data are processed with nominal motion compensation applied, partially focusing the image, then the motion compensation of individual subpatches is refined. The results show that the proposed algorithm is effective in compensating for deviations from a straight flight path, from both a performance and a computational efficiency point of view.
Cross-track interferometric SAR can provide 3-dimensional radar images. The technique relies on
Cross-track interferometric SAR provides 3-dimensional radar images.
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Synthetic aperture radar has been used for high resolution imaging from aircraft and satellites for many years.
Across-track interferometric SAR provides high resolution both horizontally and vertically which is of importance to topographic mapping applications.
Fully automatic processing has been proven feasible .... still seems room for improvements.
Evaluation based on standard TOPSAR product with 10m pixel spacing.
On-going processor research relating to interferometry.
This paper presents a detailed description of horizontal and vertical errors and their characteristics. Also discussed are key factors that presently limit the system performance.