Anomaly of a QZS in Orbit
The Quasi-Zenith Satellite System (QZSS) currently perform the technical confirmation and adjustments for the start of services in November 2018.
On June 2, 2018, an anomaly occurred on the third Quasi-Zenith Satellite (QZS-3, a geostationary satellite that was launched in August 2017). The switching device which selects one of the signal amplifier A and B for the satellite’s L5S signal transmission was unexpectedly flipped and the switch ceased functioning. The satellite’s L5S signal is the test signal which is used for the Positioning Technology Validation Service.
Accordingly, test signal transmission has been temporarily halted to be operated at the check-out of the switching device for QZS-2/ QZS-3 / QZS-4, which are equipped with the same switches.
An investigation will be conducted to determine the cause of this anomaly based on the views of experts who are familiar with related phenomena, and the future operation method will be considered, before restarting test signal transmission.
Setting update of Centi-meter Level Augmentation Service (CLAS) Trial Service
Starting Date of QZSS Services
Commencement of QZS-3, QZS-4 Satellite Report for Disaster and Crisis Management (DC Report) trial service
Start of QZS-4 Trial Service
Start of QZS-3 Trial Service
Start of Sub-meter Level Augmentation Service (SLAS) Trial Service using QZS-2
Commencement of Satellite Report for Disaster and Crisis Management (DC Report) trial service
Start of Centi-meter Level Augmentation Service (CLAS) Trial Services using QZS-1
Change of Centi-meter Level Augmentation Service (CLAS) Trial Service
Start of QZS-2 Trial Service
Restart of Centi-meter Level Augmentation Service Trial Services
Distribution stop of Centi-meter Level Augmentation Service Trial Services
Start of Trial Services
QZS-1 Control Will be Transferred to the Cabinet Office, Followed by an Adjustment Period Before the Trial Service Start