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G. Les-mesures,

, Le signal des satellites GPS

, 13 à 10"14 sur un jour) fournit une fréquence fondamentale /0 = 10, 23 MHz. A partir de cette fréquence, deux ondes sont générées, Li (fréquence fi = 1575,42 MHz), de longueur d'onde 19 cm environ, et L2 (fréquence fi -1227, 60 MHz), de longueur d'onde 24,4 cm, qui sont modulées par des codes pseudo-aléatoires avant d'être transmises. -Le code C/A (Coarse/Acquisition code), modulé sur L1 uniquement par une série de +1 et -1 à la fréquence fondamentale /i0, ce qui correspond à une longueur d, Chaque satellite, doté d'une horloge atomique embarquée assurant une grande stabilité à sa référence temporelle

, modulé sur L\ et L2 à la fréquence 10/o (longueur d'onde 29,3 m), tou jours par une série de +1 et -1, qui se répète tous les 267 jours. Ce code, permettant une mesure directe plus précise

. C. Fig, 9 -Séries temporelles de la latitude, longitude et hauteur sur ellipsoïde sur Macquarie, obtenues à partir de la solution globale libre rattachée avec CATREF à TURF 97, 3 stations fiducielles

, Généralités Ce document résume la situation générale de l'implantation de la station de réception GPS en Terre Adélie en Décembre 1997. L'ensemble récepteur-antenne a été installé et configuré par Fabrice Roubaud

, L'antenne a été installée sur un pilier construit pendant la campagne d'été 1995-96 par M

, Le récepteur est situé à 7 mètres de l'antenne dans l'abri 'Chantal' (bâtiment 43 de la Base Dumont

, Un modem relié au récepteur permet de rapatrier tous les jours les données vers le laboratoire de géophysique de 'antenne : Constructeur : Ashtech Type : Choke ring antenna Part. : 700936 REV : E Installation L'antenne est installée sur un pilier située sur l'île des pétrels de l'archipel de Pointe Géologie en Terre Adélie

, Elle est orientée vers le nord géographique (connecteur orienté vers le nord géographique)

, Est, 66°59'54.19" Sud et 42.21 m d'altitude. La position de référence est exactement le haut du téton se trouvant au sommet du pilier. Ce téton mesure 1, La position du pilier est la suivante : 140°00'33.52

, La hauteur d'antenne (mesurée entre le haut du téton et la base de l'antenne) est 3.5 cm

Z. Le-récepteur, , p.12

, Présentation Les références suivantes sont inscrites sur le châssis du récepteur : Récepteur Ashtech MARTEC CGRS mod, p.12

. Numéro-de-série, , p.3030

. Fw,

, Un fichier représente une session d'enregistrement. Les horaires de début et de fin de session sont configurés dans le logiciel. Le récepteur dispose de plus de 5.5Mo, ce qui permet de garder en mémoire 6 jours de données. Il est donc impératif d'effacer la mémoire régulièrement pour éviter sa saturation, Le récepteur reçoit les données de l'antenne et les stocke en mémoire sous forme de fichiers

, Le logiciel HOSE peut également rapatrier les fichiers du récepteur mais il nécessite de stopper l'acquisition des données pendant ce temps

B. , E. Et, and S. , Il est en revanche utile pour décompresser un fichier R., rapatrié par REMT en 3 fichiers

B. Le-fichier and E. , les éphémérides. Ces 2 fichiers sont indispensables pour la transformation ultérieure en fichiers de format RINEX. Le fichier S., contient des informations relatives à la station

, Utilisation Pour transformer un fichier RDUM1 A98.297 créé par REMT en fichiers B, E et S, il faut lancer la commande DOS suivante

, Une fois l'écran de HOSE affiché, appuyer sur <B> puis sur <F10>. Un décompte témoigne de la progression de la décompression

, Les fichiers BDUM1 A98.297, SDUM1A98.297 et EDUM1A98

, La session d'enregistrement se terminant chaque jour à 23H59 TU, Le fichier de la veille est rapatrié chaque jour entre OH et 1H TU

, REMT rapatrie ce fichier en moins de 3A heure à 9600 bauds sur un PC du réseau du laboratoire de géophysique de Dumont d

R. C&apos;est-ce-fichier, qui sera stocké au laboratoire pendant toute l'année

, Mais la communication peut parfois stopper et aucun message d'erreur ne rend compte de cette rupture de communication

. Aussi, pour s 'assurer que le fichier est utilisable, nous le décompressons à l'aide de HOSE

, Un fichier BATCH simplifie le lancement de la commande « HOSE -r RDUM1 A98.JJJ » (l'utilisateur n'a qu'à spécifier le jour de l'année) et archive le fichier RDUM

B. Les-fichiers and E. Ne,

, Chaque mois, les fichiers RDUM sont gravés sur 2 CDROMs (en multi-sessions)

, Entre la base Dumont dVrville et l'IFRTP à Brest

, Seuls les fichiers B, E et S sont utilisés à l'Ecole Normale Supérieure pour le dépouillement des données. Ce sont donc ces fichiers qui sont envoyés lors des rotations du bateau à Dumont

, Il est nécessaire de décompresser tous les fichiers RDUM.. à envoyer. Cette opération ne prend que 2 à 3 H sur un PC 200Mhz avec HOSE et avec l'aide d'un petit logiciel qui évite à l

A. France and . Priori, les données doivent être envoyées aux rotations RO et à R4 de l'Astrolabe. Problèmes techniques rencontrés

, Les problèmes ont été rares cette année. Nous n'avons eu aucun problème majeur

, Nous pouvions établir une connexion avec le récepteur mais il était impossible d'effectuer la transmission. Nous avons mis le récepteur quelques instants sur arrêt, petits incidents à signaler toutefois : ? Le 6/7/98 : Impossible de rapatrier le fichier

, Quelques fichiers incorrects sont passés au travers de la procédure de vérification des fichiers RDUM.. en début d'année (jours 40, 90 en, 1997.

. ?-l&apos;, écran rétro éclairé du récepteur reste continuellement allumé alors qu'il est censé s'éteindre au bout de quelques minutes de non utilisation du clavier

. Enfin, il faut aussi parler de la procédure d'envoi quotidienne par modem des fichier RDUM.. en France qui était prévu lors de la mise en place de cette expérience en décembre 1997. Les débits autorisés par les voies Inmarsat A et B (9600 bauds au maximum) rendent lourde l'envoi de fichiers de 1

. Dumont-d&apos;urville, Cette opération a été stoppée après quelques essais en février 1998. C'est à la suite de cette décision qu'a été adopté la procédure d'archivage sur CDROM