An H-2A rocket carrying Japan’s fourth and final quasi-zenith satellite, the Michibiki No. 4, lifts off from the Tanegashima Space Center in Kagoshima Prefecture, southwestern Japan
Having four satellites that loop over Japan and Australia in a figure of eight orbit will allow for uninterrupted coverage. Japanese GPS can locate devices to within centimetres compared with the US system, which has an accuracy of about 10m.
Quasi-Zenith Satellite System (QZSS)
It is own version of GPS and is dubbed as Michibiki system. Michibiki means guidance in Japanese. It is intended for civilian use, with a claimed positioning accuracy down to mere centimetres.
The QZSS constellation of 8 satellites will trace out a figure-8 pattern over Japan, the Western Pacific, and Australia. The Michibiki system can cover the Asia-Oceania region and works with the US-operated GPS to provide higher level of precision than previously possible with fewer satellites in visible range.
