October 10, 2017 – Mitsubishi Heavy Industries, Ltd. and JAXA successfully launched H-IIA Launch Vehicle No. 36 (H-IIA・F36) which encapsulates MICHIBIKI No. 4, Quasi-Zenith Satellite System; at 7:01:37a.m., 2017 (JST) from the JAXA Tanegashima Space Center.
The launch and flight of H-IIA Launch Vehicle No. 36 proceeded as planned. So did the separation of MICHIBIKI No. 4, which was confirmed at approximately 28 minutes and 20 seconds after liftoff.
On August 19, 2017, Mitsubishi Heavy Industries, Ltd. and JAXA successfully launched H-IIA Launch Vehicle No. 35 (H-IIA F35) which encapsulates MICHIBIKI No. 3, (3rd satellite Quasi-Zenith Satellite System).
The 2nd satellite of QZSS was launched on June 1, 2017 using H-2A rocket.
Quasi-Zenith Satellite System (QZSS) is a Japanese satellite positioning system composed mainly of satellites in quasi-zenith orbits (QZO). However, the term “Quasi-Zenith Satellite (QZS)” can refer to both satellites in QZO and geostationary orbits (GEO). For that reason, the name “QZO satellite” is used when it is necessary to specifically refer to satellites in QZO.
Satellite positioning systems use satellite signals to calculate position information. One famous example is the American Global Positioning System (GPS); the QZSS is sometimes called the “Japanese GPS.”
Japan plans to boost the number of its geo-positioning satellites to seven by 2023, making its system independently operational even if the US GPS becomes unavailable for some reason.