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The Test Transmission of signal authentication data (notice of suspension)

National Space Policy Secretariat, Cabinet Office 

The Quasi-Zenith Satellite System is working on the development of a "Signal Authentication Service (Navigation Message Authentication)" to provide a mechanism for verifying the authenticity of positioning signals, and is scheduled to launch the service in fiscal 2024. Prior to the service launch, we have started test distribution of signal authentication data as shown in Section 1 from July 31, 2023. However, we would like to inform you that the test distribution will be temporarily suspended during the period shown in Section 2.

1. GNSS Signal Authentication
  -Satellites : QZS-2, QZS-3, QZS-4, QZS-1R
    -Signal : L6E
    -Authentication target : GPS L1C/A, L1C, L5, Galileo E1B, E5a
2. Suspended Transmission Period
    December 21, 2023 - January 10, 2024

In addition, the content of the transmission as shown in Section 3 will be added from January 10 (QZSS authentication data will be added).

3. QZSS Signal Authentication
  -Satellites : QZS-2, QZS-3, QZS-4, QZS-1R
    -Signal : L1C/A, L1C, L5
    -Authentication target : QZSS L1C/A, L1C, L5 

-There will be no impact on existing receivers and other QZSS services after the QZSS signal authentication test transmission.

Format is in accordance with “IS-QZSS-SAS-001_Draft-003” in the web page of “Performance Standard (PS-QZSS) and Interface Specification (IS-QZSS)” (