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Schedule for changes in the transmission patterns of navigation messages for PNT services

Dec.18,2023
National Space Policy Secretariat, Cabinet Office 

As previously announced, we would like to inform you that we are planning to change the transmission patterns of navigation messages for PNT services in late December 2023 for the test transmission of QZSS signal authentication data scheduled in January 2024. Please see below for details.

  • Date: December 21, 2023
  • Satellites: QZS-2, QZS-3, QZS-4 and QZS-1R
  • Signals: L1C/A, L5 and L1C
  • PNT services are available even during this work.
  • The changes of transmission pattern will be implemented at the same top of the hour for each signal per satellite. The timings for changing between the 4 satellites will not be synchronized.
  • From the completion of this work until the start of QZSS signal authentication data test transmission (scheduled for January 2024), the test mode data defined in IS-QZSS-PNT-005 will be set for the slots for signal authentication data.

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