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Multipath Interferences in Ground-Based Radar Data: A Case Study

Lucas, Celia and Leinss, Silvan and Bühler, Yves and Marino, Armando and Hajnsek, Irena (2017) Multipath Interferences in Ground-Based Radar Data: A Case Study. Remote Sensing, 9 (12). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs9121260. ISSN 2072-4292.

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Official URL: http://www.mdpi.com/journal/remotesensing

Abstract

Multipath interference can occur in ground-based radar data acquired with systems with a large antenna beam width in elevation in an upward looking geometry, where the observation area and the radar are separated by a reflective surface. Radiation reflected at this surface forms a coherent overlay with the direct image of the observation area and appears as a fringe-like pattern in the data. This deteriorates the phase and intensity data and therefore can pose a considerable disadvantage to many ground-based radar measurement campaigns. This poses a problem for physical parameter retrieval from backscatter intensity and polarimetric data, absolute and relative calibration on corner reflectors, the generation of digital elevation models from interferograms and in the case of a variable reflective surface, differential interferometry. The main parameters controlling the interference pattern are the vertical distance between the radar antennas and the reflective surface, and the reflectivity of this surface. We used datasets acquired in two different locations under changing conditions as well as a model to constrain and fully understand the phenomenon. To avoid data deterioration in test sites prone to multipath interference, we tested a shielding of the antennas preventing the radar waves from illuminating the reflective surface. In our experiment, this strongly reduced but did not completely prevent the interference. We therefore recommend avoiding measurement geometries prone to multipath interferences.

Item URL in elib:https://elib.dlr.de/116691/
Document Type:Article
Title:Multipath Interferences in Ground-Based Radar Data: A Case Study
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lucas, Celiaeth zürichUNSPECIFIED
Leinss, Silvaneth zürichUNSPECIFIED
Bühler, Yvesbuehler (at) slf.chUNSPECIFIED
Marino, Armandoarmando.marino (at) open.ac.ukUNSPECIFIED
Hajnsek, IrenaUNSPECIFIEDUNSPECIFIED
Date:5 December 2017
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
DOI :10.3390/rs9121260
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Remote Sensing
ISSN:2072-4292
Status:Published
Keywords:radar; interference; interferometry; reflection; multipath interference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:07 Dec 2017 08:28
Last Modified:14 Dec 2019 04:26

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