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GNSS test standards for cellular location / Peter Anderson in GPS world, vol 24 n° 5 (May 2013)

Public [article]  inGPS world > vol 24 n° 5 (May 2013) . - pp 27 - 37 Titre : GNSS test standards for cellular location Type de document : Article/Communication Auteurs : Peter Anderson, Auteur ; Esther Anyaegbu, Auteur ; Richard Catmur, Auteur Année de publication : 2013 Article en page(s) : pp 27 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] microsystème électromécanique [Termes IGN] norme [Termes IGN] positionnement par GNSS [Termes IGN] récepteur GNSS [Termes IGN] standard [Termes IGN] téléphone intelligent [Termes IGN] test de performance Résumé : (Auteur) GNSS receivers in cell phones will soon support four or more satellite constellations and derive additional location measurements from other sources: cellular location, MEMS sensors, Wi-Fi, and others. The authors propose test standards covering these sources, meeting industry requirements for repeatable testing while considering the user experience. Numéro de notice : A2013-249 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32387 [article]

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067-2013051	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Generating distorded GNSS signals using a signal simulator / Mathieu Raimondi in GPS world, vol 24 n° 5 (May 2013)

Public [article]  inGPS world > vol 24 n° 5 (May 2013) . - pp 45 - 50 Titre : Generating distorded GNSS signals using a signal simulator Type de document : Article/Communication Auteurs : Mathieu Raimondi, Auteur ; Eric Sénant, Auteur ; Charles Fernet, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 45 - 50 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] forme d'onde [Termes IGN] positionnement par GNSS [Termes IGN] signal Galileo [Termes IGN] signal GPS [Termes IGN] simulation de signal Résumé : (Auteur) INTEGRITY. It is one of the most desirable personality traits. It is the characteristic of truth and fair dealing, of honesty and sincerity. The word also can be applied to systems and actions with a meaning of soundness or being whole or undivided. This latter definition is clear when we consider that the word integrity comes from the Latin word integer, meaning untouched, intact, entire the same origin as that for the integers in mathematics: whole numbers without a fractional or decimal component. Integrity is perhaps the most important requirement of any navigation system (along with accuracy, availability, and continuity). It characterizes a system's ability to provide a timely warning when it fails to meet its stated accuracy. If it does not, we have an integrity failure and the possibility of conveying hazardously misleading information. GPS has built into it various checks and balances to ensure a fairly high level of integrity. However, GPS integrity failures have occasionally occurred. One of these was in 1990 when SVN19, a GPS Block II satellite operating as PRN19, suffered a hardware chain failure, which caused it to transmit an anomalous waveform, evidenced by carrier leakage on the L1 signal spectrum. Receivers continued to acquire and process the SVN19 signals, oblivious to the fact that the signal distortion resulted in position errors of three to eight meters. Errors of this magnitude would normally go unnoticed by most users, and the significance of the failure wasn't clear until March 1993 during some field tests of differential navigation for aided landings being conducted by the Federal Aviation Administration. The anomaly became known as the “evil waveform.”(I'm not sure who first came up with this moniker for the anomaly. Perhaps it was the folks at Stanford University who have worked closely with the FAA in its aircraft navigation research. The term has even made it into popular culture. The Japanese drone-metal rock band, Boris, released an album in 2005 titled Dronevil. One of the cuts on the album is “Evil Wave Form.” And if drone metal is not your cup of tea, you will find the title quite appropriate.). Other types of GPS evil waveforms are possible, and there is the potential for such waveforms to also occur in the signals of other global navigation satellite systems. It is important to fully understand the implications of these potential signal anomalies. In this month's column, our authors discuss a set of GPS and Galileo evil-waveform experiments they have carried out with an advanced GNSS RF signal simulator. Their results will help to benchmark the effects of distorted signals and perhaps lead to further improvements in GNSS signal integrity. Numéro de notice : A2013-250 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32388 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-2013051	RAB	Revue	Centre de documentation	En réserve L003	Disponible