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Calibration and Operation of a Bistatic Real-Aperture Polarimetric-Interferometric Ku-Band Radar

Stefko, Marcel and Frey, Othmar and Werner, Charles and Hajnsek, Irena (2021) Calibration and Operation of a Bistatic Real-Aperture Polarimetric-Interferometric Ku-Band Radar. IEEE Transactions on Geoscience and Remote Sensing, p. 1. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2021.3121466. ISSN 0196-2892.

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Official URL: https://ieeexplore.ieee.org/abstract/document/9580835/authors#authors


This article presents the bistatic operation mode and the performance analysis of KAPRI, a terrestrial frequency-modulated continuous wave (FMCW) Ku-band polarimetric radar interferometer capable of acquiring bistatic full-polarimetric datasets with high spatial and temporal resolution. In the bistatic configuration, the system is composed of two independently-operating KAPRI devices, one serving as a primary transmitter-receiver, and the other as a secondary receiver. The secondary bistatic dataset is affected by possible offsets between the two devices’ reference clocks, as well as distortions arising from the bistatic geometry. To correct for this, we present a two-chirp bistatic FMCW signal model which accounts for the distortions, and a reference chirp transmission procedure which allows correcting the clock offsets in the deramped signal time domain. The second challenge of operation of a bistatic polarimetric system is polarimetric calibration, since it is not possible to employ purely monostatic targets such as corner reflectors. For this purpose we developed a novel active calibration device VSPARC (Variable-Signature Polarimetric Active Radar Calibrator), designed for monostatic and bistatic calibration of all polarimetric channels. VSPARC and its associated novel polarimetric calibration method were then used to achieve full calibration of both KAPRI devices with polarimetric phase calibration accuracy of 20° and 30 dB polarization purity in field conditions. This article thus presents a complete measurement configuration and data processing pipeline necessary for synchronization, coregistration, and polarimetric calibration of bistatic and monostatic datasets acquired by a real-aperture FMCW radar.

Item URL in elib:https://elib.dlr.de/145015/
Document Type:Article
Title:Calibration and Operation of a Bistatic Real-Aperture Polarimetric-Interferometric Ku-Band Radar
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:19 October 2021
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 1
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Series Name:IEEE Transactions on Geoscience and Remote Sensing
Keywords:Calibration, Spaceborne radar, Radar, Radar polarimetry, Radar antennas, Receiving antennas, Geometry, Bistatic radar, real-aperture radar, polarimetric calibration, active radar calibrator
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:01 Nov 2021 15:21
Last Modified:27 Jun 2023 09:33

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