Schreiber, Eric und Peichl, Markus und Jirousek, Matthias (2013) A calibration concept for passive MW imaging using beam steering by frequency shift and aperture synthesis. In: Proceedings of SPIE Security + Defence 2013, 8900 (89000E). SPIE Digital Library. SPIE Security + Defence 2013, 2013-09-23 - 2013-09-26, Dresden, Deutschland. doi: 10.1117/12.2028641.
Dieses Archiv kann nicht den Volltext zur Verfügung stellen.
Offizielle URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1759226
Kurzfassung
Passive microwave (MW) remote sensing is used in Earth observation missions for example to estimate the salinity of oceans or the soil moisture of landscapes. In these cases the absolute brightness temperature numbers are important for sufficient accuracy of the estimated geo-physical parameters. Consequently a suitable system calibration network is required. At DLR a radiometric demonstrator for fully-electronic MW imaging was set up at Ka band, which is based on a combination of beam steering by frequency shift using a broadband slotted-waveguide antenna for one scanning direction, and the application of aperture synthesis for the other direction. Aperture synthesis is well known from radio astronomy, but it is still a new imaging principle for Earth observation or security applications. Hence as well new calibration techniques have to be developed for this kind of scanning mechanism. In this paper a novel approach for a noise-source based calibration method taking into account the antenna losses will be introduced. When using aperture synthesis techniques to determine the absolute brightness temperature values, it is very important, among other things, to know the exact phase transfer function of the system in order to achieve the desired radiometric resolution. Consequently our approach enables phase calibration as well. The paper outlines a proof of concept for this calibration method using a two-element interferometer called VESAS (Voll Elektronischer Scanner mit AperturSynthese) as a demonstrator. Various calibrated measurement results will be presented and discussed.
elib-URL des Eintrags: | https://elib.dlr.de/83032/ | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | A calibration concept for passive MW imaging using beam steering by frequency shift and aperture synthesis | ||||||||||||||||
Autoren: |
| ||||||||||||||||
Datum: | Oktober 2013 | ||||||||||||||||
Erschienen in: | Proceedings of SPIE Security + Defence 2013 | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
Band: | 8900 | ||||||||||||||||
DOI: | 10.1117/12.2028641 | ||||||||||||||||
Verlag: | SPIE Digital Library | ||||||||||||||||
Name der Reihe: | Millimetre Wave and Terahertz Sensors and Technology VI | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | Aperture synthesis, frequency dependent scanning, slotted-waveguide antenna, calibration network, noise source, radiometry, microwave imaging, Ka band | ||||||||||||||||
Veranstaltungstitel: | SPIE Security + Defence 2013 | ||||||||||||||||
Veranstaltungsort: | Dresden, Deutschland | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 23 September 2013 | ||||||||||||||||
Veranstaltungsende: | 26 September 2013 | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||
HGF - Programmthema: | Erdbeobachtung | ||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | R EO - Erdbeobachtung | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Sicherheitsrelevante Erdbeobachtung | ||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||
Institute & Einrichtungen: | Institut für Hochfrequenztechnik und Radarsysteme > Aufklärung und Sicherheit | ||||||||||||||||
Hinterlegt von: | Schreiber, Eric | ||||||||||||||||
Hinterlegt am: | 06 Nov 2014 10:31 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 19:49 |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags