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        <gco:CharacterString>Base GNSS des services de Vichy Communauté (CVIC) située sur la commune de Vichy (03).

Caractéristiques :
- Antenne : ArduSimple AS-ANT3B-CAL
- Récepteur : ArduSimple simpleRTK3B Pro
- Constellations observées : GPS, GLONASS, Galileo, Beidou et SBAS
- Bandes de fréquences : L1 + L2/E5b + L5/E5a + E6.

Au 15/10/2026, un re-calcul de positionnement est en cours suite à la mise à niveau du matériel en triple fréquence. De manière provisoire, la position actuellement diffusée est celle de l'ancien équipement en attentant les résultats du nouveau calcul. Malgré des spécifications d'antenne proches, les corrections fournies par la station peuvent provisoirement être entachées d'une erreur de quelques millimètres en XYZ.

Position d'origine calculée manuellement sous RTKLIB / RTKPOS, à partir de données brutes acquises entre le 22 et le 28 juin 2025 (7 jours). Le traitement a été réalisé avec les données des constellations GPS et GLONASS associées aux éphémérides finaux calculés par l'ESA.

Les corrections de la base sont diffusées sur le réseau Centipède RTK et peuvent être utilisées pour faire du GNSS RTK.</gco:CharacterString>
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