GPS
Definition
The Global Positioning System (GPS) is a technology that determines the precise location of something or someone on earth. It is a navigation system that involves a network of 24 satellites in orbit around the Earth, designed and implemented by the U.S. Department of Defense for military navigation. However, with adjustments made to the satellite's transmissions, civilian use of the GPS technology has been made possible.
What is GPS?
GPS is a satellite-based navigation system consisting of a network of satellites orbiting the earth at an altitude of approximately 20,000 km. The system provides geolocation and time information to a GPS receiver located anywhere on or near the Earth. For a GPS receiver to produce an accurate positional fix, it needs signals from at least four satellites to relate the user's position in three dimensions - latitude, longitude, and altitude. This technology is used in navigation, mapping, surveying, and other applications where precise location data is required.
GPS works in all weather conditions, 24 hours a day, with no subscription fees or setup charges. The U.S. Department of Defense (U.S. DoD) operates the system, which can also be accessed by anyone with a GPS receiver.
FAQs
How does a GPS work?
GPS works by transmitting signals from satellites to a GPS receiver on the Earth's surface. The receiver then calculates the time that each signal took to travel from the satellite to the receiver, using this information to calculate the user's exact location.
Does GPS work everywhere?
Yes, GPS works anywhere on or near the Earth's surface. The system operates globally, under any weather conditions, as long as the receiver has an unobstructed view of four or more satellites.
Is there a cost associated with using GPS?
No, the use of GPS technology is free of charge. However, the user must have a GPS receiver to access the system.
Can GPS be used for more than just finding locations?
Yes, GPS technology is versatile and is useful in a wide variety of applications beyond navigation. It can be used for mapping, surveying, timing, and tracking, to name a few.
Is GPS the only satellite navigation system?
No, there are several other satellite navigation systems such as Russia's GLONASS, the European Union's Galileo, and China's BeiDou. However, GPS is the most widely used system worldwide.
