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Antenna Pattern Measurements of Weather Radars Using the Sun and a Point Source

Reimann, Jens and Hagen, Martin (2016) Antenna Pattern Measurements of Weather Radars Using the Sun and a Point Source. Journal of Atmospheric and Oceanic Technology, 33 (5), pp. 891-898. American Meteorological Society. DOI: 10.1175/JTECH-D-15-0185.1 ISSN 0739-0572

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Official URL: http://journals.ametsoc.org/doi/pdf/10.1175/JTECH-D-15-0185.1

Abstract

The sun is known to be a good target for weather radar calibration. In this paper high-resolution raster scans of the sun at high elevations will be used to derive the antenna pattern of weather radar, without being affected by beam propagation effects and reflections close to the earth’s surface. It is shown that this pattern matches well to pattern measurements using a point source. Hence, a good estimation of the real antenna pattern can be derived using the sun. Furthermore, formulas to extract undistorted antenna patterns from the sun, even at high-elevation angles, are derived. The signal processing required to achieve high sensitivity for the antenna pattern measurements will be described. Important parts of the antenna pattern—for example, sidelobes—become visible when using long integration times. The polarimetric receiver channel cross-correlation coefficient is proposed as a figure of merit of the cross-polar isolation of the antenna and hence the cross-polar pattern. The results are also compared to point source measurements. This illustrates how an unpolarized signal source like the sun can be used to derive polarimetric variables.

Item URL in elib:https://elib.dlr.de/104070/
Document Type:Article
Title:Antenna Pattern Measurements of Weather Radars Using the Sun and a Point Source
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reimann, JensDLR, HRUNSPECIFIED
Hagen, MartinDLR, IPAUNSPECIFIED
Date:18 February 2016
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:33
DOI :10.1175/JTECH-D-15-0185.1
Page Range:pp. 891-898
Publisher:American Meteorological Society
ISSN:0739-0572
Status:Published
Keywords:Radar, Kalibrierung, Calibration, Polarimetry, Paolrimetrie, Wetterradar, weather radar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Reimann, Jens
Deposited On:21 Apr 2016 09:17
Last Modified:31 Jul 2019 20:01

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