What is the QZSS GPS in new Android phone?Japanese GPS system/Quasi Zenith Satellite (QZS) System

What is the Japanese GPS system QZSS? QZSS GPS in new Android phone? QZSS Accuracy,Country,Operator,Total satellites‎?

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 Country/ies of origin    Japan
Operator(s)    JAXA
Type    civilian
Status    in implementation
Coverage    regional
Accuracy    0.01–1 meters
 

Constellation size
Total satellites    4 (7 in the future)
Satellites in orbit    4
First launch    September 2010
Orbital characteristics
Regime(s)    3x GSO
 

Other details
Cost    JPY 170 billion
Website    qzss.go.jp/en/

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 In recent flagship phone included QZSS for more powerful location track.
The Quasi-Zenith Satellite System (QZSS) (準天頂衛星システム Juntencho eisei shisutemu) is a project of the Japanese government for the development of a four-satellite regional time transfer system and a satellite-based augmentation system for the United States operated Global Positioning System (GPS) to be receivable 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 (QZS-4) are available on a trial basis as of January 12, 2018, and are scheduled to commence as a production service on November 1, 2018.

Quasi-Zenith Satellite System (QZSS)
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.”

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Complements GPS for satellite positioning, navigation and timing service that is more precise and stable


Satellite positioning is possible with four or more satellites, but a larger number of satellites is ideal for obtaining stable positioning information. However, the number of visible GPS satellites was smaller in urban and mountainous areas where satellite signals are obstructed by buildings, trees, and other objects, making the stable acquisition of positioning information impossible in some cases.

When QZSS (Michibiki) becomes a four-satellite constellation in 2018, three satellites will be visible at all times from locations in the Asia-Oceania regions. QZSS can be used in an integrated way with GPS, ensuring a sufficient number of satellites for stable, high-precision positioning. QZS are compatible with GPS and receivers can be procured at a low cost, so it is expected that position information businesses utilizing geographical and spatial information will be developed.