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Tο παρακάτω Eνημερωτικό Δελτίο GPS (NANU) ενημερώνει τους χρήστες GPS ότι από τα μεσάνυκτα 30 Iουνίου/1 Iουλίου 1997, με την εισαγωγή ενός δευτερολέπτου (leap second) στη κλίμακα χρόνου UTC (Universal Coordinated Time), από την Διεθνή Yπηρεσία για την Περιστροφή της Γης (International Earth Rotation Service, IERS), ο συσχετισμός με την κλίμακα χρόνου που εκφράζεται από το GPS αλλάζει σε: GPS-UTC = +12 sec
The following text was obtained from the United States Naval Observatory's Automated Data Service. Any files referred to are on that system. 3 June 1997 UNITED STATES NAVAL OBSERVATORY (USNO) AUTOMATED DATA SERVICE (ADS) LATEST ANNOUNCEMENTS OF GPS SATELLITE OUTAGES *********************************************************************** This file is updated as frequently as new information becomes available. Entries are retained for at least 24 hours. The references to JDAY or DAY used in the Notice Advisory to Navstar Users (NANU) by the Master Control Station should be understood to mean the day of year (DOY) that begins at 0000 UT. *********************************************************************** 301355Z MAY 97 FM 2SOPS FALCON AFB CO// UNCLAS NOTICE ADVISORY TO NAVSTAR USERS (NANU) 061-97161 SUBJ: FORECAST OUTAGE PRN04 (SVN34) JDAY 161/0030-UP TO 12 HOURS 1. CONDITION: GPS SATELLITE PRN04 (SVN34) IS SCHEDULED TO BE UNUSABLE ON JDAY 161 (10 JUN 97) BEGINNING 0030 ZULU FOR UP TO 12 HOURS DUE TO SCHEDULED MAINTENANCE. 2. THIS SCHEDULED MAINTENANCE WILL REPOSITION PRN04. USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY. 3. AFFECTED AREAS: GLOBAL. 4. POC: NAVIGATION ANALYST AT (719) 567-6378 OR DSN 560-6378. RECEIVED AT USNO 02 JUN 97
302000Z MAY 97 FM 2SOPS FALCON AFB CO// UNCLAS NOTICE ADVISORY TO NAVSTAR USERS (NANU) 062-97182 SUBJ: LEAP SECOND 1. CONDITION: THE INTERNATIONAL EARTH ROTATION SERVICE (IERS) HAS ANNOUNCED THE INTRODUCTION OF A LEAP SECOND TO OCCUR AT THE END OF JUNE 1997. 2. COORDINATED UNIVERSAL TIME (UTC) WILL SEQUENCE AS FOLLOWS: 30 JUNE 1997 23 HOURS 59 MINUTES 59 SECONDS 30 JUNE 1997 23 HOURS 59 MINUTES 60 SECONDS 1 JULY 1997 0 HOURS 0 MINUTES 0 SECONDS 3. FOR GPS, AS WITH PREVIOUS LEAP SECOND UPDATES, THE UTC DATA IN SUBFRAME 4, PAGE 18 OF THE NAVIGATION MESSAGE WILL CHANGE IN ACCORDANCE WITH ICD-GPS-200. BEFORE THE LEAP SECOND GPS-UTC IS 11 (GPS IS AHEAD OF UTC BY 11 SECONDS) AFTER THE LEAP SECOND GPS-UTC WILL BE 12 (GPS WILL BE AHEAD OF UTC BY 12 SECONDS) 4. POC: NAVIGATION ANALYST AT COMMERCIAL (719) 567-6378 OR DSN 560-6378. RECEIVED AT USNO 02 JUN 97
310954Z MAY 97 FM 2SOPS FALCON AFB CO// UNCLAS NOTICE ADVISORY TO NAVSTAR USERS (NANU) 063-97151 SUBJ: PRN29 (SVN29) UNUSABLE JDAY 141/1504-151/0354 (CORRECTED COPY) REF: NANU 062-97151 (DTG 310535 Z MAY 97) 1. CONDITION: GPS SATELLITE PRN29 (SVN29) WAS UNUSABLE ON JDAY 141 (21 MAY 97) BEGINNING 1504 ZULU UNTIL JDAY 151 AT 0354 ZULU. 2. CORRECTION: RETURN TIME FROM OUTAGE IS 151/0355 NOT 151/0354. NANU NUMBER GIVEN WAS INCORRECT, PLEASE REFERENCE NEW NANU NUMBER. 3. POC: NAVIGATION ANALYST AT COMMERCIAL (719 567-6378) OR DSN 560-6378. RECEIVED AT USNO 02 JUN 97 O 022241Z JUN 97 FM 2SOPS FALCON AFB CO//DO// UNCLAS NOTICE ADVISORY TO NAVSTAR USERS (NANU) 064-97153 SUBJ: FORECAST OUTAGE SUMMARY PRN19 (SVN19) JDAY153/1400-153/2110 REF: NANU 060-97153 (DTG 291327ZMAY97) 1. CONDITION: GPS SATELLITE PRN19 (SVN19) WAS UNUSABLE ON JDAY 153 (02 JUN 97) BEGINNING 1400 ZULU UNTIL JDAY 153 AT 2110 ZULU DUE TO MAINTENANCE. SCHEDULED MAINTENANCE DID NOT REPOSITION PRN19. 2. POC: NAVIGATION ANALYST AT (719) 567-6378 OR DSN 560-6378. RECEIVED AT USNO 03 JUN 97 *********************************************************************** Questions regarding the USNO GPS ADS files should be directed to: Francine Vannicola Lara Schmidt fmv@cassini.usno.navy.mil lss@ramsey.usno.navy.mil 202-762-1455 DSN 762-1455 202-762-0289 DSN 762-0289
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