Calibration of galileo signals for time metrology

Defraigne, Pascale; Aerts, Wim; Cerretto, Giancarlo; Cantoni, E.; Sleewaegen, Jean-Marie

doi:10.1109/tuffc.2014.006649

Cited by 25 publications

(13 citation statements)

References 12 publications

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“…The antenna cable is commonly considered a non-dispersive medium (Defraigne et al 2014). However, Dyrud et al (2008) showed that a small constant variation of 0.004 m or approximately 13 ps (picoseconds) can exist in the absolute DCB of the receiver system while working with different cable lengths.…”

Section: Cable Dcbmentioning

confidence: 99%

Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator

et al. 2018

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(2018) Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator. GPS Solutions, 22 . 32/1-32/12. ISSN 1521-1886 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/49019/9/s10291-018-0700-7.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the Creative Commons Attribution licence and may be reused according to the conditions of the licence. For more details see: http://creativecommons.org/licenses/by/2.5/ A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractIn ionospheric modeling, the differential code biases (DCBs) are a non-negligible error source, which are routinely estimated by the different analysis centers of the International GNSS Service (IGS) as a by-product of their global ionospheric analysis. These are, however, estimated only for the IGS station receivers and for all the satellites of the different GNSS constellations. A technique is proposed for estimating the receiver and satellites DCBs in a global or regional network by first estimating the DCB of one receiver set as reference. This receiver DCB is then used as a 'known' parameter to constrain the global ionospheric solution, where the receiver and satellite DCBs are estimated for the entire network. This is in contrast to the constraint used by the IGS, which assumes that the involved satellites DCBs have a zero mean. The 'known' receiver DCB is obtained by simulating signals that are free of the ionospheric, tropospheric and other group delays using a hardware signal simulator. When applying the proposed technique for Global Positioning System legacy signals, mean offsets in the order of 3 ns for satellites and receivers were found to exist between the estimated DCBs and the IGS published DCBs. It was shown that these estimated DCBs are fairly stable in time, especially for the legacy signals. When the proposed technique is applied for the DCBs estimation using the newer Galileo signals, an agreement at the level of 1-2 ns was found between the estimated DCBs and the manufacturer's measured DCBs, as published by the European Space Agency, for the three still operational Galileo in-orbit validation satellites.

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Section: Cable Dcbmentioning

confidence: 99%

Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator

et al. 2018

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“…During the TVF In-Orbit-Validation phase [1] a method to evaluate the Galileo receiver delay in E5 was proposed and developed by the Observatoire Royal de Belgique (ORB) [2], assuming that the GPS delays in L1 and L2 are known and that the receiver delay in Galileo E1 is known or is the same as the GPS L1 delay. Differential Code Biases (DCBs) for GPS and Galileo satellites are also assumed to be available.…”

Section: Methods Overviewmentioning

confidence: 99%

“…The method is based on pseudorange data processing exclusively, without any need of instrumental intervention at the receiver site. The method description and formulation is fully described in [2] and only the key facts and main equation are summarized and adapted here.…”

Section: Methods Overviewmentioning

confidence: 99%

Relative Calibration of Galileo receivers within the Time Validation Facility (TVF)

Piriz

Rodríguez

Roldan

et al. 2015

2015 Joint Conference of the IEEE International Frequency Control Symposium &Amp; The European Frequency and Time Forum

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GMV is the prime contractor for the Time and Geodetic Validation Facility (TGVF) in the Galileo FOC phase (Full Operational Capability), a contract of the European Space Agency (ESA). Within the TGVF, the Time Validation Facility (TVF) is the subsystem in charge of steering Galileo System Time (GST) to UTC, among other duties. The TVF is operated at GMV headquarters near Madrid, Spain. Calibrated Galileo receivers are needed in the frame of TVF activities to, among other tasks, assess the UTC-GST offset broadcast in the Galileo navigation message.Absolute receiver calibration is a complex activity involving the availability of a signal simulator and of a calibrated reference antenna. An alternative data-based method to evaluate the Galileo receiver delay in E5 signals relative to GPS is also possible. The key feature of such method is the cancellation of the GPS and Galileo ionospheric delays when combining pseudoranges from two satellites with a close position in the sky.A software tool called gecal has been developed by GMV within the Galileo TVF, implementing such method and processing RINEX 3 observation files. Satellite positions are read from a SP3 orbit file. The tool allows the rapid E5 calibration of a new or existing Galileo receiver. This paper describes the tool and the calibration of three Galileo receivers used in the TVF. Galileo Signal-In-Space validation results obtained using such receivers are also presented.

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“…the hardware delays of the GNSS signals inside the antenna, the antenna cable and the receiver [8] [8] . Two methods can be used: absolute or relative.…”

Section: Service#5: User Gnss Receiver Calibrationmentioning

confidence: 99%

Experimental time dissemination services based on European GNSS signals: The H2020 DEMETRA project

Tavella

Sesia

Cerretto

et al. 2016

2016 European Frequency and Time Forum (EFTF)

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DEMETRA aims to be a prototype of an European time dissemination service, based on the timing signal of the European Galileo system, adding particular features likeamong the others -certification, calibration, or integrity, that could be of interest to a wide range of users belonging to different sectors as traffic control, energy distribution, finance, telecommunication, and scientific institutions. Nine time dissemination services are proposed. The paper will report about the development status and the first experimentation results of the system, showing potentialities and limits of the proposed time dissemination services, aiming to foster the exploitation of the European GNSS for timing applications.

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Calibration of galileo signals for time metrology

Cited by 25 publications

References 12 publications

Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator

Estimation and analysis of multi-GNSS differential code biases using a hardware signal simulator

Relative Calibration of Galileo receivers within the Time Validation Facility (TVF)

Experimental time dissemination services based on European GNSS signals: The H2020 DEMETRA project

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