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Proceedings Paper

VESAS: a novel concept for fully-electronic passive MW imaging
Author(s): Eric Schreiber; Markus Peichl; Matthias Jirousek; Helmut Suess
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Paper Abstract

These days passive microwave (MW) remote sensing has found many applications. For example, in Earth observation missions, it is possible to estimate the salinity of oceans, the soil moisture of landscapes, or to extract atmospheric parameters like the liquid water content of clouds [1, 2, 3]. Due to the penetration capabilities of microwaves through many dielectric materials, and the purely passive character of this kind of remote sensing, this technique nowadays is considered as well in many security and reconnaissance applications (e.g. observation of sensitive areas, detection of concealed objects, trough-wall imaging, etc.). Presently different imaging principles for MW radiometry are possible. Most of them still are based on pure mechanical scanning or they combine this with electronic scanning by using parts of a focal plane array [4]. Due to many advantages, the technological trend is going towards fully-electronic beam steering or two-dimensional focal plane arrays. These systems are able to achieve high frame rates, but they are still very expensive because of a significantly higher number of receiver modules, compared to a mechanical scanning system. In our approach a novel concept for a Ka band fully-electronic wide swath MW imaging radiometer system is introduced [5]. It is based on a combination of beam steering by frequency shift for one scanning direction using a slotted-waveguide antenna, and the application of aperture synthesis in the other. In the following a proof of concept is outlined using a two-element interferometer system called VESAS (Voll elektronischer Scanner mit Apertursynthese) demonstrator. The advantage of using the aperture synthesis technique is the possibility to implement minimal redundant sparse arrays without a degradation of the antenna pattern. In combination with the beam steering by frequency shift, one requires a one dimensional receiver/antenna array for a two dimensional imaging, hence a low-cost, fully-electronic wide swath microwave radiometer system with high frame rates is feasible. In the following a proof of concept is outlined by presenting different MW imaging measurement results, using this kind of imaging principle.

Paper Details

Date Published: 31 May 2013
PDF: 7 pages
Proc. SPIE 8715, Passive and Active Millimeter-Wave Imaging XVI, 87150J (31 May 2013); doi: 10.1117/12.2016990
Show Author Affiliations
Eric Schreiber, German Aerospace Ctr. (Germany)
Markus Peichl, German Aerospace Ctr. (Germany)
Matthias Jirousek, German Aerospace Ctr. (Germany)
Helmut Suess, German Aerospace Ctr. (Germany)

Published in SPIE Proceedings Vol. 8715:
Passive and Active Millimeter-Wave Imaging XVI
David A. Wikner; Arttu R. Luukanen, Editor(s)

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