The Global Positioning System (GPS), originally Navstar GPS, [2] is a satellite-based radio navigation system owned by the United States Space Force and operated by Mission Delta 31. [3][4] It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth whe...

2022年6月28日 · GPS satellites fly in medium Earth orbit (MEO) at an altitude of approximately 20,200 km (12,550 miles). Each satellite circles the Earth twice a day. Expandable 24-Slot satellite constellation, as defined in the SPS Performance Standard.

2023年9月25日 · NASA users in orbit can determine their position and time using communications channel tracking via the Deep Space Network (DSN), Near Space Network (NSN), or by on-board means of processing one-way radio-navigation signals from Global Navigation Satellite Systems (GNSS), such as the US Global Positioning System (GPS). The DSN is also capable ...

The GPS satellites circle the Earth at an altitude of about 20,000 km (13,000 miles) and complete two full orbits every day. The GPS satellites are not in a geostationary orbit, but rise and set two times per day.

GPS employs 24 spacecraft in 20,200 km circular orbits inclined at 55 degrees. These spacecraft are placed in 6 orbit planes with four operational satellites in each plane. All launches have been successful except for one launch failure in 1981.

Orbits are nearly circular, with eccentricity less than 0.02, a semi-major axis of 26 560 km, i.e. an altitude of 20 200 km. Orbits in this height are referred to as MEO – medium earth orbit. The satellites have a speed of 3.9 km per second and a nominal period of 12 h sidereal time (11 h 58m 2 s), repeating the geometry each sidereal day.

2021年2月22日 · The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services. This system consists of three segments: the space segment, the control segment, and the user segment.

The current GPS constellation includes 24 satellites, each traveling in a 12-hour, circular orbit, 20,200 kilometers above the Earth. The satellites are positioned so that six are observable nearly 100 percent of the time from any point on Earth.

• GPS consists of 24+ satellite vehicles (SVs) • The orbits are: –6 orbital planes •55 degree inclination angles –less coverage at poles –Approximate circular orbits –12 sidereal hour orbits •SV position repeats approximately every 23:56 hours •20,162 km from equator •26,561 km from center of earth •Travel at approximately ...

2024年11月25日 · GPS satellites fly in circular orbits at an altitude of 10,900 nautical miles (20,200 km) and with a period of 12 hours. The orbits are tilted to the earth's equator by 55 degrees to ensure coverage of polar regions.