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[update], 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 construction and have been declared "Available For Launch" (AFL). The next launch is GPS III SV07, scheduled for June 2024.
The constellation requires a minimum of 24 operational satellites, and allows for up to 32; typically, 31 are operational at any one time. A GPS receiver needs four satellites to work out its position in three dimensions.[1]
SVNs are "space vehicle numbers" which are serial numbers assigned to each GPS satellite. PRNs are the "pseudo-random noise" sequences, or Gold codes, that each satellite transmits to differentiate itself from other satellites in the active constellation.
After being launched, GPS satellites enter a period of testing before their signals are set to "Healthy". During normal operations, certain signals may be set to "Unhealthy" to accommodate updates or testing. After decommissioning, most GPS satellites become on-orbit spares and may be recommissioned if needed. Permanently retired satellites are sent to a higher, less congested disposal orbit where their fuel is vented, batteries are intentionally depleted and communication is switched off.[2]
^US Government. "GPS.gov". gps.gov. U.S. Government. Retrieved 21 March 2015. This article incorporates text from this source, which is in the public domain.
^"2 SOPS disposes last GPS IIA satellite after 26 years". GPS World. 17 April 2020. Retrieved 7 July 2021.
and 25 Related for: List of GPS satellites information
decommissioning, most GPSsatellites become on-orbit spares and may be recommissioned if needed. Permanently retired satellites are sent to a higher,...
satellites. In 1978, the contract was extended to build an additional three Block I satellites. Beginning with Navstar 1 in 1978, ten "Block I" GPS satellites...
independent ofGPS scheduled for 2023. The Indian Regional Navigation Satellite System, deployed by India. ListofGPSsatellitesGPSsatellite blocks GPS signals...
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...
reception requires an unobstructed line of sight to four or more GNSS satellites, and is subject to poor satellite signal conditions. In exceptionally poor...
GPS signals are broadcast by Global Positioning System satellites to enable satellite navigation. Receivers on or near the Earth's surface can determine...
(GPS) consists of up to 32 medium Earth orbit satellites in six different orbital planes. The exact number ofsatellites varies as older satellites are...
GPS receiver position is computed based on data received from the satellites. Errors depend on geometric dilution of precision and the sources listed...
of eight satellites, with two additional satellites on ground as stand-by. The constellation is in orbit as of 2018. NavIC will provide two levels of...
serial number for Global Positioning System satellites; see listofGPSsatellites SVN-98, a variant of the KSVK 12.7 Russian sniper rifle This disambiguation...
view to some satellites. GLONASS supplementation ofGPS systems also improves positioning in high latitudes (north or south). Development of GLONASS began...
satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers...
needs a minimum of five satellites in view or four satellites and a barometric altimeter (baro-aiding, a method of augmenting the GPS integrity solution...
exact number of these that are military satellites partly due to secrecy and partly due to dual purpose missions such as GPSsatellites that serve both...
US's GPS. It consists ofsatellites in three different orbits, including 24 satellites in medium-circle orbits (covering the world), 3 satellites in inclined...
orbiting satellites instead of ground-based transmitters is called a Wide-Area DGPS (WADGPS) satellite-based augmentation system. When GPS was first...
This is a listof notable commercial satellite navigation software (also known as GPS software) for various devices, with a specific focus on mobile phones...
This list covers most artificial satellites built in and operated by the Republic of India. India has been successfully launching satellitesof various...
Satellite geodesy is geodesy by means of artificial satellites—the measurement of the form and dimensions of Earth, the location of objects on its surface...
It was the first GPSsatellite to be launched, and one of eleven Block I demonstration satellites. Global Positioning System (GPS) was developed by the...
one or more satellites for broadcast to end users as differential signal. SBAS is sometimes synonymous with WADGPS, wide-area differential GPS. The SBAS...
Global Information
This article incorporates text from this source, which is in the public domain.
