How Does A GPS Navigation Operate?

The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the US. Dept of Defense. GPS was originally meant for military applications, but in the 1980s, the government made the unit accessible for civilian use. GPS works in any climatic conditions, anywhere in the world, round the clock. You will find no subscription fees or setup charges to use GPS.

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How it works

GPS satellites circle the earth two times a day in a very precise orbit and transmit signal information to earth. GPS receivers take this info and utilize triangulation to calculate the user's precise location. Essentially, the GPS receiver compares the time a signal was transferred by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a couple of more satellites, the receiver can determine the user's position and display it on the unit's electronic map.

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GPS navigation Displays

A GPS receiver should be locked on to the signal for at least three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or even more satellites in view, the receiver can figure out the user's 3D position (latitude, longitude and altitude). Once the user's position has been figured out, the GPS system may calculate other info, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and much more.

How accurate is GPS?

Today's GPS receivers are extremely accurate, thanks to their parallel multi-channel style. Certain atmospheric aspects and other sources of error could affect the accuracy of GPS receivers. GPS receivers are accurate to within 15 meters normally.

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GPS Signals

GPS receivers with WAAS (Wide Area Augmentation System) capability can improve accuracy to around three meters on average. No additional equipment or fees are needed to take advantage of WAAS. Users may also get better accuracy with Differential GPS (DGPS), that corrects GPS signals to within an average of three to five meters. The U.S. Coast Guard operates the most typical DGPS correction service. This system consists of a network of towers that receive GPS signals and transmit a corrected signal by beacon transmitters. To get the corrected signal, users must have a differential beacon receiver and beacon antenna along with their GPS.

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Satellite Diagram

The GPS satellite unit

The 24 satellites which make up the GPS space segment are orbiting the earth about 12,000 miles above us. They are continuously moving, making two complete orbits in less than 24 hours. These satellites are travelling at speeds of about 7,000 miles an hour.

GPS satellites / GPS navigatsia are powered by solar energy. They have backup batteries onboard to keep them running during a solar eclipse, when there's no solar power. Tiny rocket boosters on every satellite keep them flying in the correct path.

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Listed here are some other interesting facts about the GPS satellites (also called NAVSTAR, the official U.S. Department of Defense name for GPS):

The initial GPS satellite was launched in 1978.

A full constellation of 24 satellites was achieved in 1994.

Each satellite is built to last around 10 years. Replacements are constantly being built and released into orbit.

A GPS satellite weighs around 2,000 pounds and is about 17 feet across with the solar panels extended.

Transmitter power is just 50 watts or less.

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