The network's completion, which state media report says is six months early, establishes it as a rival to the US-owned GPS. China launched the final satellite of its BeiDou navigation system BEIDOU (China) GALILEO (EU) GLONASS (Russia) 1. GPS. GPS was the first GNSS system that began in 1978 and became fully available for global use in 1994. GPS was introduced to act as an independent military navigation system after The United States Department of Defense realized the potential value of the technology. Galileo, developed as a rival to the US GPS system, is due to be launched in 2020 with civilian and military variants. Galileo's encrypted system when it is fully operational in 2026 The fully deployed Galileo system consists of 30 satellites (27 operational + 3 active spares), positioned in three circular Medium Earth Orbit (MEO) planes at 23 222 km altitude above the Earth, and with each orbital plane inclined at 56 degrees to the equatorial plane. GPS / Galileo / Beidou / Glonass: what differences between location services - Geeko. All four are Global Navigation System Satellite (GNSS), in other words satellite positioning systems. (Global Positioning System) became fully operational. It is the result of military research and its use was reserved for the American army until 2000 when NASS-only PPP, and 25.81% over Galileo-only PPP. The results also indicate that the highest positioning accuracy was obtained by GPS/Galileo PPP. Chen et al. (2021) conduct GPS/BDS-2/BDS-3/GLONASS .

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