Satellite navigation - Wikipedia
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning. A satellite navigation system with global coverage is termed global navigation satellite system (GNSS).
全球导航卫星系统（为用户提供信息的空基无线电导航定位系统）_ …
全球导航卫星系统（英文：Global Navigation Satellite System，缩写：GNSS，又称全球卫星导航系统），是能在地球表面或近地空间的任何地点为用户提供全天候的3维坐标和速度以及时间信息的空基无线电导航定位系统。. 全球导航卫星系统（GNSS）包括一个或多个卫星 ...
Satellite Navigation - GPS - How It Works - Federal Aviation Administration
Satellite Navigation is based on a global network of satellites that transmit radio signals from medium earth orbit. Users of Satellite Navigation are most familiar with the 31 Global Positioning System (GPS) satellites developed and operated by the United States. Three other constellations also provide similar services.
ESA - How satellite navigation works - European Space Agency
How satellite navigation works. Navigation beacons must be as visible as possible. So 20th century radio navigation towers guiding aircraft stood hundreds of metres tall, while the lighthouses warning mariners of treacherous waters reach …
Other Global Navigation Satellite Systems (GNSS) - GPS: The …
Oct 19, 2021 · Global navigation satellite system (GNSS) is a general term describing any satellite constellation that provides positioning, navigation, and timing (PNT) services on a global or regional basis. While GPS is the most prevalent GNSS, other nations are fielding, or have fielded, their own systems to provide complementary, independent PNT capability.
GPS - NASA
Sep 25, 2023 · The Global Positioning System (GPS) is a space-based radio-navigation system, owned by the U.S. Government and operated by the United States Air Force (USAF). It can pinpoint a three dimensional position to meter-level accuracy and time to the 10-nanosecond level, worldwide and 24/7.
Global Navigation Satellite System (GNSS) Overview - NASA
Global Navigation Satellite System (GNSS) Overview. 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. The current GLONASS constellation includes 24 ...
GPS | Definition, Types, Uses, & Facts | Britannica
GPS, space-based radio-navigation system that broadcasts highly accurate navigation pulses to users on or near Earth. In the United States’ Navstar GPS, 24 main satellites in 6 orbits circle Earth every 12 hours.
ESA - About satellite navigation - European Space Agency
A satellite navigation system consists of a space segment, typically 24 navigational satellites, a ground or control segment and a user segment. The satellites are placed in circular orbits at heights of about 20 000 km so that at least four are visible …
Global Navigation Satellite System (GNSS) | NASA Earthdata
A GNSS system like GPS has three components: satellites in well-known orbits with synchronized clocks, ground controllers, and a ground segment providing data to users. Using signals from four satellites, a precise location in three-dimensions (within millimeters or less) along with precise time can be determined.