GPS - ορισμός. Τι είναι το GPS
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Τι (ποιος) είναι GPS - ορισμός

UNITED STATES SATELLITE NAVIGATION SYSTEM
Global positioning system; NAVSTAR; Navstar; Gps; GPS; Global positioning systems; Global positional satellite; Global positioning satellite; Global position satellite; Global positioning; Global positioning satellite system; Global positioning satellites; Navigation Signal Timing and Ranging Global Positioning System; NAVSTAR GPS; Gps coordiantes; Global Positioning Satellite; Global positional satellites; GPS time; Gps map; GPST; GPS system; Global Positioning Systems; GPS monitoring; Precise Positioning Service; Standard Positioning Service; Global Positionning System; Global position system; History of GPS; OD-GPS; US GPS; Navstar GPS; Applications of GPS; Navstar Global Positioning System; Project 621B; Defense Navigation Satellite Development Program; MObile System for Accurate ICBM Control; Military applications of GPS
  • 2-D Cartesian true-range multilateration (trilateration) scenario
  • Emblem of the [[50th Space Wing]]
  • GPS constellation system animation
  • 50px
  • '''black'''}}), that need not necessarily be mutually tangent
  • AFSPC Vice Commander Lt. Gen. DT Thompson presents Dr. Gladys West with an award as she is inducted into the Air Force Space and Missile Pioneers Hall of Fame.
  • W}}).
  • GPS receivers come in a variety of formats, from devices integrated into cars, phones, and watches, to dedicated devices such as these.
  • Ground monitor station used from 1984 to 2007, on display at the [[Air Force Space and Missile Museum]]
  • antenna]] is mounted on the roof of a hut containing a scientific experiment needing precise timing.
  • Unlaunched GPS block II-A satellite on display at the [[San Diego Air & Space Museum]]
  • Three satellites (labeled as "stations" A, B, C) have known locations. The true times it takes for a radio signal to travel from each satellite to the receiver are unknown, but the true time differences are known. Then, each time difference locates the receiver on a branch of a hyperbola focused on the satellites. The receiver is then located at one of the two intersections.
  • The first portable GPS unit, a Leica WM 101, displayed at the [[Irish National Science Museum]] at [[Maynooth]]
  • A typical GPS receiver with integrated antenna
  • Attaching a GPS guidance kit to a [[dumb bomb]], March 2003
  • [[M982 Excalibur]] GPS-guided [[artillery shell]]

GPS         
WIKIMEDIA DISAMBIGUATION PAGE
Gp; GP (disambiguation); G.P. (disambiguation); G.p.; Gp.; G P; GPs
Global Positioning System
GPS         
WIKIMEDIA DISAMBIGUATION PAGE
Gp; GP (disambiguation); G.P. (disambiguation); G.p.; Gp.; G P; GPs
someone who really likes to give driving directions. (after Global Positioning System)
She wants to know how to get here? Give her to John, he's the GPS.
GPS         
WIKIMEDIA DISAMBIGUATION PAGE
Gp; GP (disambiguation); G.P. (disambiguation); G.p.; Gp.; G P; GPs

Βικιπαίδεια

Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems (GNSS) that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. It does not require the user to transmit any data, and operates independently of any telephonic or Internet reception, though these technologies can enhance the usefulness of the GPS positioning information. It provides critical positioning capabilities to military, civil, and commercial users around the world. Although the United States government created, controls and maintains the GPS system, it is freely accessible to anyone with a GPS receiver.

The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was launched in 1978 and the full constellation of 24 satellites became operational in 1993. Originally limited to use by the United States military, civilian use was allowed from the 1980s following an executive order from President Ronald Reagan after the Korean Air Lines Flight 007 disaster. Advances in technology and new demands on the existing system have now led to efforts to modernize the GPS and implement the next generation of GPS Block IIIA satellites and Next Generation Operational Control System (OCX). which was authorized by the U.S. Congress in 2000.

From the early 1990s, GPS positional accuracy was degraded by the United States government by a program called Selective Availability, which could selectively degrade or deny access to the system at any time, as happened to the Indian military in 1999 during the Kargil War. However, this practice was discontinued on May 1, 2000, in accordance with a bill signed into law by President Bill Clinton. As a result, several countries have developed or are in the process of setting up other global or regional satellite navigation systems.

The Russian Global Navigation Satellite System (GLONASS) was developed contemporaneously with GPS, but suffered from incomplete coverage of the globe until the mid-2000s. GLONASS reception in addition to GPS can be combined in a receiver thereby allowing for additional satellites available to enable faster position fixes and improved accuracy, to within two meters (6.6 ft).

China's BeiDou Navigation Satellite System began global services in 2018, and finished its full deployment in 2020. There are also the European Union Galileo navigation satellite system, and India's NavIC. Japan's Quasi-Zenith Satellite System (QZSS) is a GPS satellite-based augmentation system to enhance GPS's accuracy in Asia-Oceania, with satellite navigation independent of GPS scheduled for 2023.

When selective availability was lifted in 2000, GPS had about a five-meter (16 ft) accuracy. GPS receivers that use the L5 band have much higher accuracy, pinpointing to within 30 centimeters (11.8 in), while high-end users (typically engineering and land surveying applications) are able to have accuracy on several of the bandwidth signals to within two centimeters, and even sub-millimeter accuracy for long-term measurements. Consumer devices, like smartphones, can be as accurate as to within 4.9 m (or better with assistive services like Wi-Fi positioning also enabled). As of May 2021, 16 GPS satellites are broadcasting L5 signals, and the signals are considered pre-operational, scheduled to reach 24 satellites by approximately 2027.

Παραδείγματα από το σώμα κειμένου για GPS
1. HOW GPS WORKS GPS satellites transmit signals to equipment on the ground.
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