PARSAX An Informal Look at Radar Technology and Applications within TU Delft

24May/100

Radar principle…

Radar principle by Dusan Petricic

Drawing by Dusan Petricic - from presentation of Geoffroy Lerosey

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23May/100

Thematic Seminar: “The radars: from applications to the mathematical theory”

New Geometric Foundation of Radar Processing by Frédéric Barbaresco

Recently I've received from Frédéric Barbaresco information about thematic seminar: "The radars: from applications to the mathematical theory" ("Les radars : depuis la théorie mathématique jusqu'aux applications"), which took place in Poitiers, France, 5 Mai 2010. The presentations have been done in French, but a lot of interesting information on avalable slides is presented in English. In his own presentation dr. Barbaresco included nice introduction and review into concepts of the Information Geometry, the New Geometric Foundation of Radar Processing and their application to the radar data processing. Some of presented concepts and approaches (Covariance Matrix Mean/Median, Polarimetric Diffusive CFAR) can be directly implemented and tested in our study, during processing of the PARSAX polarimetric data.

11May/100

Processing of Dual-Orthogonal CW Polarimetric Radar Signals by Galina Babur

This day one year ago we were sitting in the Aula and distressed for the defense of the first PhD thesis, which has been done in the framework of the PARSAX project. It was Galina Babur who presented and successfully defended her thesis "Processing of Dual-Orthogonal CW Polarimetric Radar Signals".

The thesis consists of two parts. The first part is devoted to the theory of dual-orthogonal polarimetric radar signals with continuous waveforms.Processing of Dual-Orthogonal CW Polarimetric Radar Signals by Galina Babur The thesis presents a comparison of the signal compression techniques, namely correlation and de-ramping methods, for the dual-orthogonal sophisticated signals. The novel time-frequency representation of beat signals in frequency modulated continuous wave (FM-CW) polarimetric radar with simultaneous measurement of scattering matrix elements is shown. Since the sounding sophisticated signals usually have large time-bandwidth product, the observed object motion can result in specific bandwidth effects in the scattered signals. A novel wide-band correlation processing for overcoming the limitations due to these bandwidth effects is proposed for polarimetric radar signals. Also a novel wide band model of the de-ramped signals is described. The second part of the thesis is devoted to advanced processing in polarimetric radar with continuous waveforms (and focus on polarimetric FM-CW radar). A novel technique for continuous “quasi-simultaneous” measurement of the elements of the scattering matrix, which can provide high isolation level between the branches in the radar receiver channels, has been proposed in this PhD thesis. The ambition to increase the radar performance, namely to improve the radar range resolution, has led to the development of a novel flexible de-ramping processing applicable in single-channel and in polarimetric FM-CW radar. The problem of isolation in the polarimetric FM-CW radar receiver is especially acute. A novel method allowing to mitigate the problem is developed. The modeling results of the proposed method show its high efficiency. (Thesis’ abstract)

For those who interesting in the topic of radar polarimetry, the full text of this manuscript is available on-line at the TU Delft Institutional Repository.