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Centimeter Level Augmentation Service (CLAS)

Outline

This is the download site for QZSS archives about Centimeter Level Augmentation Service (CLAS).

Broadcasted L6 messages (Centimeter-Level Augmentation Service Messages) generated by CLAS are provided according to L6 message format, refer to section 4.1. of IS-QZSS-L6-004.

Note:

Because of maintenance period of ground systems, etc., some data may be missing.

Data Definition

Refer to section 4.1. of IS-QZSS-L6-004.

Centimeter-Level augmentation information is included in the data part of L6 message.

The data part includes multiple RTCM STANDARD 10403.2 compatible messages, called "Compact SSR Messages"*.

* RTCM SC-104 QZSS Working Group, "Specification of Compact SSR Messages for Satellite Based Augmentation Service,"

RTCM Paper, Specification of Compact SSR Messages for Satellite Based Augmentation Service, Version 0.8, 17-SEP-2019.

Public Archive Data of the augmentation information based on the updated coordinate system, ITRF2014 (IGb14), compliant with IS-QZSS-L6-004 (July 14, 2021) was started by Quasi-Zenith Satellite System Services Inc. (QSS) from 05:00 UT on August 2, 2021, replacing the data compliant with the IGS05 coordinate system that had been distributed earlier.

How to use

STEP1 : Choose Data Period.

STEP2 : Choose needed data from Data List.

STEP3 : Download!

Data Select

L6 Signal

Data Period

Data List