Quasi-Zenith Satellite System
 | |
| Country/ies of origin | Japan |
|---|---|
| Operator | Quasi-Zenith Satellite System Services Inc. / Cabinet Office |
| Type | Civilian |
| Status | Operational |
| Coverage | Regional |
| Accuracy | PNT: <10 m (33 ft) SLAS: <1 m (3 ft 3 in) CLAS: <10 cm (3.9 in) |
| Constellation size | |
| Nominal satellites | 7 |
| Current usable satellites | 5 |
| First launch | 11 September 2010 |
| Last launch | 2 February 2025 |
| Total launches | 6 |
| Orbital characteristics | |
| Regime(s) | GEO (2 × GSO, 3 × QZO) |
| Other details | |
| Cost | ¥160 billion |
| Website | qzss |
The Quasi-Zenith Satellite System (QZSS) (Japanese: 準天頂衛星システム, Hepburn: juntenchō eisei shisutemu), also known as Michibiki (みちびき, "guidance"), is a regional navigation satellite system (RNSS) and a satellite-based augmentation system (SBAS) developed by the Japanese government to enhance the United States-operated Global Positioning System (GPS) in the Asia-Oceania regions, with a focus on Japan. The goal of QZSS is to provide highly precise and stable positioning services in the Asia-Oceania region, compatible with GPS. Four-satellite QZSS services were available on a trial basis as of 12 January 2018, and officially started on 1 November 2018. A satellite navigation system independent of GPS is planned for 2023 with seven satellites. In May 2023 it was announced that the system would expand to eleven satellites.