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...-Book">J. Sanz Subirana, JM. Juan Zornoza and M. Hernández-Pajares, Global Navigation Satellite Systems: Volume I: Fundamentals and Algorithms</ref> ...sidereal day. The space segment is subject to [[GPS_Future_and_Evolutions|maintenance and evolutions]].

...<ref name=gpsworld></ref>. The red slots indicate that the satellite is in maintenance. Blue means correct operation. ...satellite orbit, clock and other information. Separate 50-bits-per-second navigation messages are modulo-2 added to the ST- and VT-codes. The ST-code message in

The Quasi-Zenith Satellite System (QZSS) is a regional navigation satellite system commissioned by the Japanese Government as a National Spac ...Status of Quasi-Zenith Satellite System (QZSS), presentation at the Munich Navigation Congress, March 2011.</ref> In 2017 all three remaining satellites were lau

...hind the scenes there are millions of employees involved in manufacturing, maintenance and monitoring of the products and services required in the never-ending cy ...ation Commission. Its primary role is to advise the Council of ICAO on air navigation issues. It is composed of fifteen experts with appropriate qualifications a

...ed Augmentation Systems (SBAS)]] broadcast through GEO satellites GPS-like navigation signals containing differential corrections and integrity data to enhance t ...ations: International Standards and Recommended Practices, Volume 1, Radio Navigation Aids, November 2002.</ref>, and the system is declared Unavailable when the