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Impact of GPS Flex Power on Differential Code Bias Estimation for Block IIR-M and IIF Satellites

Esenbuga, Özge Gizem and Hauschild, André and Steigenberger, Peter (2020) Impact of GPS Flex Power on Differential Code Bias Estimation for Block IIR-M and IIF Satellites. In: Proceedings of the 33rd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2020, pp. 2922-2930. ION GNSS+ 2020 Virtual, 22.-25. Sep. 2020, virtuell. doi: 10.33012/2020.17634. ISBN 978-093640626-8. ISSN 2331-5954.

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=17634

Abstract

The modernized GPS satellites, Block IIR-M, and follow-on GPS satellites, Block IIF, can redistribute the transmit power between the signal components. This is called flex power and it has been developed as a remedy against jamming. From January 2017 until February 13, 2020, a flex power was active which was centered at 41°E and 37°N for only Block IIF satellites. On February 14, 2020, a new flex power mode is activated on both GPS Block IIR-M and Block IIF satellites centered at 37ºE/35ºN and 69ºE/35ºN. The changes in the transmit power affect the carrier-to-noise density ratio (C/N0) observations as well as the differential code bias (DCB) estimations. To see the impact of the flex power on DCB estimations, first DCBs are calculated without considering these changes. Next, a second DCB estimation is done by considering the flex power into the calculations. This time, two different DCBs are estimated for the satellite when it is inside and outside of the flex power activation area. The extension of this area is identified by analyzing flex power induced discontinuities in carrier-to-noise density ratio observations. In order to reduce the effects of the different front-end and correlator settings on estimated DCBs, a global network of exclusively Septentrio PolaRx5 and PolaRx5TR receivers is used and the results are compared with each other. Additionally, a global network of Javad receivers is used and compared with Septentrio PolaRx5 and PolaRx5TR to study the impact of using different the receivers on DCB estimations.

Item URL in elib:https://elib.dlr.de/138477/
Document Type:Conference or Workshop Item (Speech)
Title:Impact of GPS Flex Power on Differential Code Bias Estimation for Block IIR-M and IIF Satellites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Esenbuga, Özge Gizemoezge.Esenbuga (at) dlr.deUNSPECIFIED
Hauschild, Andréandre.hauschild (at) dlr.dehttps://orcid.org/0000-0002-0172-3492
Steigenberger, Peterpeter.steigenberger (at) dlr.deUNSPECIFIED
Date:2020
Journal or Publication Title:Proceedings of the 33rd International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.33012/2020.17634
Page Range:pp. 2922-2930
ISSN:2331-5954
ISBN:978-093640626-8
Status:Published
Keywords:Differential Code Biases, Flex Power, GPS Block IIF, GPS Block IIR-M
Event Title:ION GNSS+ 2020 Virtual
Event Location:virtuell
Event Type:international Conference
Event Dates:22.-25. Sep. 2020
Organizer:Institute of Navigation (ION)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Esenbuga, Özge Gizem
Deposited On:27 Nov 2020 11:33
Last Modified:25 Jan 2021 15:01

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