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Applying a Composite Pattern Scheme to Clutter Cancellation with the Airborne POLARIS Ice Sounder

Morrison, Keith und Bennett, John und Scheiber, Rolf (2013) Applying a Composite Pattern Scheme to Clutter Cancellation with the Airborne POLARIS Ice Sounder. International Symposium on Radarglaciology, 2013-09-09 - 2013-09-13, Lawrence, Kansas, USA.

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Offizielle URL: http://www.igsoc.org/symposia/2013/kansas/proceedings/

Kurzfassung

The European Space Agency’s (ESA) POLarimetric Airborne Radar Ice Sounder demonstrator (POLARIS) – built, maintained and deployed by the Technical University of Denmark – operates at P-band and features a multi-phase-center antenna for surface clutter suppression. Data for the development and demonstration of surface clutter cancellation methods were acquired in February 2011 during the IceGrav campaign in Antarctica. The POLARIS radar uses a four-element cross-track antenna to control clutter suppression. The 0.96 m element spacing – 1.4 wavelengths – is significantly greater than the spacing required to avoid grating-lobe ambiguities. The ESA funded the present study to investigate and compare different methods for surface clutter cancellation and to implement a software tool to augment the along-track POLARIS processor developed by the ESA, thus improving bedrock detectability. Within this study, Cranfield University carried out an investigation of the performance of a composite pattern approach to the POLARIS clutter suppression. The scheme exploits the principle of pattern multiplication, whereby the required composite four-element array is produced by the convolution of smaller sub-arrays. This has the advantage that it is computationally much simpler to work with two-element arrays and generate nulls in preferred directions, which are retained in the angular response of the final four-element composite array. Other approaches that consider all four elements need to seek solutions to a set of simultaneous equations. The work considered the performance of the scheme with reference to varying input parameters, which included pulse bandwidth, aircraft roll and cross-track terrain slopes. The work started by recognizing that a four-element array can produce three primary nulls (plus higher-order nulls due to the wide element spacing). A general excitation for this particular case was developed to make best use of all the available information at each array element. The optimum solution was found to have two nulls placed towards the clutter angles required, but with the third always placed towards the endfire direction. This positioning of the third null was found to maximize the gain in the nadir direction. Because of grating-lobe effects arising from the large element spacing, placing nulls at the 45° clutter angles caused a null to be also placed at nadir, leading to a singularity at this depth. However, it was found that by degrading nulling performance at this angle the nadir-singularity could be avoided.

elib-URL des Eintrags:https://elib.dlr.de/85199/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Applying a Composite Pattern Scheme to Clutter Cancellation with the Airborne POLARIS Ice Sounder
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Morrison, KeithCranfield University, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bennett, JohnUniversity of Shefield, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Scheiber, RolfNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:9 September 2013
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:polar ice sheets, surface clutter
Veranstaltungstitel:International Symposium on Radarglaciology
Veranstaltungsort:Lawrence, Kansas, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:9 September 2013
Veranstaltungsende:13 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 - Flugzeug-SAR
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme
Institut für Hochfrequenztechnik und Radarsysteme > SAR-Technologie
Hinterlegt von: Scheiber, Dr.-Ing. Rolf
Hinterlegt am:08 Nov 2013 13:53
Letzte Änderung:24 Apr 2024 19:51

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