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2. NEXTAR - Wikipedia

   en.wikipedia.org/wiki/NEXTAR

   NEXTAR (from NEC Ne x t Generation St ar) is a Low Earth orbit Earth observation satellite bus designed and manufactured by NEC Space Systems of Japan. [1] [2] This three axis stabilized platform has a bus dry mass of 250 kg (550 lb), it can carry payloads up to 250 kg (550 lb) and 600 W. It uses tri-junction GaAs has an expected life between 3 ...

3. Global Positioning System - Wikipedia

   en.wikipedia.org/wiki/Global_Positioning_System

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

4. Satellite navigation - Wikipedia

   en.wikipedia.org/wiki/Satellite_navigation

   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). As of 2024, four global systems are operational: the United States 's Global Positioning System (GPS), Russia 's Global Navigation ...

5. GPS tracking unit - Wikipedia

   en.wikipedia.org/wiki/GPS_tracking_unit

   A GPS tracking unit, geotracking unit, satellite tracking unit, or simply tracker is a navigation device normally on a vehicle, asset, person or animal that uses satellite navigation to determine its movement and determine its WGS84 UTM geographic position (geotracking) to determine its location. [1] Satellite tracking devices may send special ...

6. List of GPS satellites - Wikipedia

   en.wikipedia.org/wiki/List_of_GPS_satellites

   Samples of three GPS satellites' orbits over a five-year period (2013 to 2018) USA-242 · USA-239 · USA-151 · Earth As of 15 August 2023, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 4 are unhealthy or in reserve, 41 are retired, 2 were lost during launch, and 1 prototype was never launched. 4 Block III satellites have completed ...

7. GPS Block III - Wikipedia

   en.wikipedia.org/wiki/GPS_Block_III

   GPS Block III. GPS Block III (previously Block IIIA) consists of the first ten GPS III satellites, which will be used to keep the Navstar Global Positioning System operational. Lockheed Martin designed, developed and manufactured the GPS III Non-Flight Satellite Testbed (GNST) and all ten Block III satellites. [7]