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Wavelets and notch filtering: innovative techniques for mitigating RF interference / M. Paonni in Inside GNSS, vol 6 n° 1 (January - February 2011)
[article]
Titre : Wavelets and notch filtering: innovative techniques for mitigating RF interference Type de document : Article/Communication Auteurs : M. Paonni, Auteur ; J. Jang, Auteur ; Bernd Eissfeller, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : 9 p. ; pp 54 - 62 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] filtrage du signal
[Termes IGN] interférence
[Termes IGN] radiofréquence
[Termes IGN] transformation en ondelettesRésumé : (Auteur) As interest in use of GNSS for safety critical applications gains momentum, interference concerns abound. Pulsed interference and continuous wave signals can degrade the reception of GNSS signals. The authors present emerging concepts for detecting and mitigating interference by means of digital processing techniques applied in the receiver. Numéro de notice : A2011-617 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/2431 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33390
in Inside GNSS > vol 6 n° 1 (January - February 2011) . - 9 p. ; pp 54 - 62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2011011 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Wavelets and notch ... - pdf éditeurAdobe Acrobat PDF GNSS RF Compatibility assessment: Interference among GPS, Galileo and Compass / W. Liu in GPS world, vol 21 n° 12 (December 2010)
[article]
Titre : GNSS RF Compatibility assessment: Interference among GPS, Galileo and Compass Type de document : Article/Communication Auteurs : W. Liu, Auteur ; X. Zhan, Auteur ; L. Liu, Auteur ; M. Niu, Auteur Année de publication : 2010 Article en page(s) : pp 32 - 40 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] compatibilité
[Termes IGN] configuration (matériel informatique)
[Termes IGN] dégradation du signal
[Termes IGN] géonavigateur
[Termes IGN] interférence
[Termes IGN] rapport signal sur bruit
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur mixte
[Termes IGN] signal BeiDou
[Termes IGN] signal Galileo
[Termes IGN] signal GNSS
[Termes IGN] signal GPSRésumé : (Auteur) A comprehensive methodology combines spectral-separation and code-tracking spectral-sensitivity coefficients to analyze interference among GPS, Galileo, and Compass. The authors propose determining the minimum acceptable degradation of effective carrier-to-noise-density ratio, considering all receiver processing phases, and conclude that each GNSS can provide a sound basis for compatibility with other GNSS with respect to the special receiver configuration. Numéro de notice : A2010-540 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30732
in GPS world > vol 21 n° 12 (December 2010) . - pp 32 - 40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2010121 RAB Revue Centre de documentation En réserve L003 Disponible The GPS assimilator: Upgrading receivers via benign spoofing / T. Humphreys in Inside GNSS, vol 5 n° 4 (June 2010)
[article]
Titre : The GPS assimilator: Upgrading receivers via benign spoofing Type de document : Article/Communication Auteurs : T. Humphreys, Auteur ; J. Bhatti, Auteur ; B. Ledvina, Auteur Année de publication : 2010 Article en page(s) : 9 p. ; pp 50 - 58 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] anti-leurrage
[Termes IGN] brouillage
[Termes IGN] interférence
[Termes IGN] leurrage
[Termes IGN] récepteur GNSSRésumé : (Auteur) Interference, jamming, and spoofing are increasing the GNSS user community’s concerns about the security and reliability of their receivers. Although solutions are being proposed for future equipment designs that can process multiple signals from multiple GNSS systems, this article introduces a method for upgrading existing GPS user equipment to improve accuracy, robustness, and resistance to spoofing. Numéro de notice : A2010-674 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33449
in Inside GNSS > vol 5 n° 4 (June 2010) . - 9 p. ; pp 50 - 58[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-2010041 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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The GPS assimilator ... - pdf éditeurAdobe Acrobat PDF
Titre : Interference measurements of the Nummela standard baseline in 2005 and 2007 Type de document : Monographie Auteurs : Jorma Jokela, Auteur ; P. Häkli, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 2010 Collection : Publications of the Finnish Geodetic Institute, ISSN 0085-6932 num. 144 Importance : 90 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-951-711-283-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] comparateur de Vaisala
[Termes IGN] Finlande
[Termes IGN] interférence
[Termes IGN] ligne de base
[Termes IGN] mesurage électronique de distancesRésumé : (Auteur) The Nummela Standard Baseline of the Finnish Geodetic Institute is a unique national and international measurement standard for length measurements in geodesy. The design of the 864-m baseline was originally, in 1933, fitted for the calibration of 24-m invar wires to determine a uniform scale for triangulation. Since 1947, the baseline has been regularly measured with the Vaisala interference comparator. As a continuation to the impressive time series, the performance and results of the latest interference measurements in 2005 and 2007 are presented in detail in this publication. Two consecutive measurements within a short time span were necessary, since only half of the baseline could be measured in 2005, due to unfavourable weather conditions. The new results again confirm the excellent stability and unique accuracy, 9xlO"8, of the baseline. The 6-pillar baseline now serves in the calibration, testing and validation of electronic distance measurement (EDM) instruments for precise surveying and mapping and in scale transfer measurements to other geodetic baselines, test fields and local geodynamical networks. The measurements are metrologically traceable to the definition of the metre through a quartz gauge system.
This publication provides a summary of the rare measurement method and is a detailed supplement to the previously published or internal instruction manuals. First, we present the quartz gauge systems, which determine the scale in the Vaisala interference comparator. After a description of the present comparison method for the quartz gauges, the computation of the scale for the latest interference measurements is presented. For the interference measurements, the comparator must be separately constructed for every baseline. We describe the preparations and installations for this, followed by the observation and computation procedures. The abundant illustrations clarify the many stages. For further utilization of the baseline, the projection measurements are an essential part of the entire measurement. They transfer the distances between the mirror surfaces in the comparator to the distances between the permanently fixed transferring bars on the observation pillars, and, finally, to the baseline lengths between the underground benchmarks. We present the estimation of the uncertainty of measurement as standard and expanded uncertainties, combining all of the sources of the uncertainty in the traceability chain.
The standard uncertainties of the new results range from ±0.02 mm to ±0.07 mm for the lengths of the baseline sections ranging from 24 m to 864 m. The result for the length of the entire baseline, 864 122.86 mm ±0.07 mm, differs +0.11 mm from the previous result in 1996 and +0.08 mm from the first result in 1947. The largest difference between the results in 2005 and 2007 is -0.08 mm. The state-of-the-art Nummela Standard Baseline remains a world-class measurement standard of geodetic length metrology.Note de contenu : 1 Introduction
2 Landmarks in the history of the Nummela Standard Baseline
2.1 First international recognitions
2.2 Change from invar wires to EDM instruments as transfer standards
2.3 Recent construction works
2.4 Importance in the 2010s
3 Traceability chain of geodetic length measurements
4 Quartz gauges in the determination of the scale
4.1 Review of quartz gauge systems at Tuorla Observatory
4.2 Comparisons at Tuorla Observatory
4.3 Determination of the length of quartz gauge no. VIII in BTM00
5 Preparing the baseline for interference measurements
5.1 Principle of the Vaisala interference comparator
5.2 Preparing the observation pillars for interference measurements
5.3 Precise levellings - start of the measurements
5.4 Aligning the mirrors
5.5 Setting the mirrors at correct positions in the baseline direction
5.6 Installing the transferring bars onto the observation pillars
5.7 Installations on the telescope pillar
5.8 Installations on pillars 0 and 1
6 Interference observations
6.1 Observation procedure
6.2 About weather conditions
6.3 Personnel
7 Determination of corrections
7.1 Compensator corrections
7.2 Refraction correction
7.3 Corrections due to mirrors
7.4 Geometric corrections
7.5 Projection corrections
8 Computation of baseline lengths
8.1 Computation of the actual length of the quartz gauge
8.2 Results from interference observations in 2005
8.3 Results from interference observations in 2007
8.4 Final lengths
9 Estimation of uncertainty of measurement
9.1 Combined uncertainty of the lengths between the underground markers
9.2 Some supplementary analysis of uncertainty of measurement
10 Summary and conclusionsNuméro de notice : 14650 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie En ligne : https://www.maanmittauslaitos.fi/sites/maanmittauslaitos.fi/files/fgi/FGI_Publ_1 [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62678 Documents numériques
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14650_fgi-publ-144_jokela.pdfAdobe Acrobat PDF Signal authentication: a secure civil GNSS for today / S. Lo in Inside GNSS, vol 4 n° 5 (September - October 2009)
[article]
Titre : Signal authentication: a secure civil GNSS for today Type de document : Article/Communication Auteurs : S. Lo, Auteur ; D. De Lorenzo, Auteur ; P. Enge, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : 10 p. ; pp 30 - 39 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] anti-leurrage
[Termes IGN] architecture de système
[Termes IGN] authentification
[Termes IGN] brouillage
[Termes IGN] interférence
[Termes IGN] leurrage
[Termes IGN] positionnement par GNSS
[Termes IGN] sécurité
[Termes IGN] signal GPS
[Termes IGN] utilisateur civilRésumé : (Auteur) Many civil GNSS applications need secure, assured information for asset tracking, fleet management and the like. But there is also a growing demand for geosecurity location-based services such as hardware configuration and management, virtual site licenses, digital rights management and geofencing. Unfortunately, GNSS is vulnerable to malicious intrusion and spoofing. How can users be sure the information they receive is authentic? This article introduces a new method that uses hidden attributes fundamental to the GPS satellite broadcast — and cross-compared between two receivers — to authenticate signals and the location solutions they generate. Copyright Gibbons Media & Research LLC Numéro de notice : A2009-668 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33560
in Inside GNSS > vol 4 n° 5 (September - October 2009) . - 10 p. ; pp 30 - 39[article]Documents numériques
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Signal authentication ... - pdf éditeurAdobe Acrobat PDF Architecture for a future C-band/L-band GNSS mission : Part 2 signal considerations and related user terminal aspects / José Avila-Rodriguez in Inside GNSS, vol 4 n° 4 (July - August 2009)PermalinkSynthetic aperture GPS signal processing: concept and feasibility demonstration / A. Soloviev in Inside GNSS, vol 4 n° 3 (May - June 2009)PermalinkA multi-antenna defence: receiver-autonomous GPS spoofing detection / P. Montgomery in Inside GNSS, vol 4 n° 2 (March - April 2009)PermalinkGNSS / Scott Gleason (2009)PermalinkInterference heads-up: receiver techniques for detecting and characterizing RFI [radio-frequency interference] / P. Ward in GPS world, vol 19 n° 6 (June 2008)PermalinkGalileo signal experimentation / M. Hollreiser in GPS world, vol 18 n° 5 (May 2007)PermalinkElectromagnetic wave scattering from the sea surface in the presence of wind wave patterns / V. Shrira in International Journal of Remote Sensing IJRS, vol 24 n° 24 (December 2003)PermalinkRadiofrequency interference and GPS: a growing concern / F. Butsch in GPS world, vol 13 n° 10 (October 2002)PermalinkGPS limitations and vulnerabilities / K. de Jong in Geoinformatics, vol 5 n° 3 (01/04/2002)PermalinkRunning interference : testing a suppression unit / M.S. Braasch in GPS world, vol 9 n° 3 (March 1998)Permalink