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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]].10 KB (1,482 words) - 13:40, 4 November 2020
- ...<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 in13 KB (2,045 words) - 13:35, 30 October 2019
- 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 lau16 KB (2,324 words) - 11:53, 29 September 2021
- ...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 a28 KB (3,864 words) - 09:57, 10 September 2021
- ...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 the27 KB (4,257 words) - 15:35, 3 August 2018