Related topics: space · launch · satellite

Five things to consider before speed limiters are added to cars

The recent announcement that EU rules for fitting speed limiters to new cars from 2022 will be adopted by the UK was welcomed by many, including the European Transport Safety Council, as a move that will save lives. However, ...

Amelia Earhart would have a hard time disappearing in 2019

When Amelia Earhart took off in 1937 to fly around the world, people had been flying airplanes for only about 35 years. When she tried to fly across the Pacific, she – and the world – knew it was risky. She didn't make ...

New tool helps minimize impact of solar activity

University of Saskatchewan researcher Lindsay Goodwin has developed a new way to measure the impact of solar activity on the ionosphere as indicated by northern lights and geomagnetic storms. The ionosphere is the upper part ...

Long-lived soundwaves in crystalline solids

A new study published in Nature Physics describes how a team of scientists used a laser beam to gain access to long-lived soundwaves in crystalline solids as the basis for a potentially new approach to information processing ...

A marriage of light-manipulation technologies

Researchers have, for the first time, integrated two technologies widely used in applications such as optical communications, bio-imaging and Light Detection and Ranging (LIDAR) systems that scan the surroundings of self-driving ...

Sticky gels turn insect-sized drones into artificial pollinators

As bees slip onto the endangered species list in the United States, researchers in Japan are pollinating lilies with insect-sized drones. The undersides of these artificial pollinators are coated with horse hairs and an ionic ...

page 1 from 23

Global Positioning System

The Global Positioning System (GPS) is a global navigation satellite system (GNSS) developed by the United States Department of Defense and managed by the United States Air Force 50th Space Wing. It is the only fully functional GNSS in the world, can be used freely by anyone, anywhere, and is often used by civilians for navigation purposes. It uses a constellation of between 24 and 32 medium Earth orbit satellites that transmit precise radiowave signals, which allow GPS receivers to determine their current location, the time, and their velocity. Its official name is NAVSTAR GPS. Although NAVSTAR is not an acronym, a few backronyms have been created for it.

Since it became fully operational on April 27, 1995, GPS has become a widely used aid to navigation worldwide, and a useful tool for map-making, land surveying, commerce, scientific uses, tracking and surveillance, and hobbies such as geocaching. Also, the precise time reference is used in many applications including the scientific study of earthquakes and as a required time synchronization method for cellular network protocols such as the IS-95 standard for CDMA.

This text uses material from Wikipedia, licensed under CC BY-SA