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Calibration of Adaptive Antennas in Satellite Navigation Receivers

Konovaltsev, Andriy and Cuntz, Manuel and Meurer, Michael (2010) Calibration of Adaptive Antennas in Satellite Navigation Receivers. In: Proceedings of The European Navigation Conference on Global Navigation Satellite Systems ENC GNSS 2010. Deutsche Gesellschaft für Ortung und Navigation . ENC GNSS 2010, 2010-10-19 - 2010-10-21, Braunschweig.

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Adaptive antennas with digital beamforming represent a promising technology for mitigation of radio interference and multipath effects in receivers of Global Satellite Navigation Systems (GNSS, e.g. GPS, Galileo). Due to the mitigation of interfering signals in spatial domain, they allow for better performance in terms of signal to noise plus interference ratio (SNIR). However, the adaptive antenna techniques may also introduce deviation of the array phase centre from its nominal position, which results in erroneous pseudo-range and carrier-phase measurements of the GNSS array receiver. The deviation of the array phase centre manifests itself through some additional carrier phase shifts and signal group delays caused by the adaptive antenna to the received signals. In order to control such deviations and to produce the corresponding corrections, the magnitude and phase response of the adaptive array system described by a system transfer function must be known for the directions of arrival of the satellite signals. The aim of the paper is to explain the challenge and the need of stabilizing phase centres of adaptive GNSS antennas and to detail the novel development of suitable means for controlling the phase centres. The problem of correcting for the phase centre deviation is tightly related to the calibration problem of the antenna array hardware. Indeed, in both problems the phase and amplitude distortions of an ideal array response due to the transfer characteristics of the array antenna elements and RF front-ends should be determined. Therefore, the solution of the calibration problem can be also considered as the solution for correcting for the phase centre deviations. The focus of this paper is on practical aspects of the array calibration in GNSS adaptive antenna systems. After introducing the system transfer function of an adaptive antenna, a model for the error propagation from the domain of code- and carrier-based pseudo-range observations of a GNSS receiver into the positioning error domain will be shortly outlined. This model will be further used to show the effect of phase calibration errors and different radiation patterns of the array elements on the GNSS receiver performance defined in term of user positioning and timing errors. A practical implementation of the adaptive GNSS antenna system that includes a real-time calibration capability will be presented. The performance of the array calibration will be demonstrated by using the field test results for beamforming and direction-of-arrival estimation as well as positioning by using code and carrier measurements.

Item URL in elib:https://elib.dlr.de/68203/
Document Type:Conference or Workshop Item (Speech)
Title:Calibration of Adaptive Antennas in Satellite Navigation Receivers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Meurer, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7465-6705UNSPECIFIED
Date:21 October 2010
Journal or Publication Title:Proceedings of The European Navigation Conference on Global Navigation Satellite Systems ENC GNSS 2010
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:Deutsche Gesellschaft für Ortung und Navigation
Keywords:Phase Center, Digital Beamforming, Array Processing, Adaptive Antennas, Calibration
Event Title:ENC GNSS 2010
Event Location:Braunschweig
Event Type:international Conference
Event Start Date:19 October 2010
Event End Date:21 October 2010
Organizer:DGON Deutsche Gesellschaft für Ortung und Navigation e.V.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W KN - Kommunikation/Navigation
DLR - Research area:Space
DLR - Program:W KN - Kommunikation/Navigation
DLR - Research theme (Project):W - Projekt Galileo Advanced Applications (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Cuntz, Manuel
Deposited On:11 Jan 2011 07:45
Last Modified:24 Apr 2024 19:33

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