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Launch of the upgraded CLAS Service corresponding to 17 augmented satellites

Nov.17,2020
National Space Policy Secretariat, Cabinet Office 

Centi-meter Level Augmentation Service (CLAS) has been broadcasting trial signal compliant with IS-QZSS-L6-003 (*1) using the L6D signal of the Quasi-Zenith Satellite-3, which increases the number of augmented satellites to a maximum of 17 for more stable positioning accuracy (*2).

From 15:00 on Nov. 30 (JST), the official broadcast of the augmentation information compliant with IS-QZSS-L6-003 from all the Quasi-Zenith Satellites (QZS-1, 2, 3, and 4) will be launched. Before the launch, the CLAS service from all the QZSS satellites will be suspended from 12:00 to 15:00 on Nov. 30 due to the specification update of the augmentation information from all the QZSS satellites (*3). We apologize for any inconvenience this may cause and thank you for your understanding.

Timeline of the Specification Update
  QZS-1 QZS-2 QZS-4 QZS-3
Until 12:00 on Nov. 30 (JST) The signal complies with IS-QZSS-L6-001. Trial operation
From 12:00 to 15:00 on Nov. 30 (JST) Service interruption period. The alert flag is fixed at "1".
After 15:00 on Nov. 30 (JST) The signal complies with IS-QZSS-L6-003.

In order to continue using CLAS after the launch of the official broadcast, it may be necessary to update the receiver's F/W to comply with IS-QZSS-L6-003. Please contact the manufacturer of the CLAS receiver for further information.

*1: Please refer to the Interface Specification (IS-QZSS-L6-003, Aug. 20, 2020) of Centi-meter Level Augmentation Service.

*2: Please refer to the "Notices" released on June 19, 2020. The title of the link is "Trial transmission of Augmentation Information for IS-QZSS-L6-002" because this announcement had been made before IS-QZSS-L6-003 was released.

*3: Details of the service interruption period will be announced by NAQU messages.

END