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What is GPS receiver?
What is GPS receiver?
GPS also means GPS receiver and its job is to locate four or more satellites....
When people talk about "a GPS," they usually mean a GPS receiver. The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). The U.S. military developed and implemented this satellite network as a military navigation system, but soon opened it up to everybody else.
A GPS receiver's job is to locate four or more of these satellites, figure out the distance to each, and use this information to deduce its own location. This operation is based on a simple mathematical principle called trilateration.
The most essential function of a GPS receiver is to pick up the transmissions of at least four satellites and combine the information in those transmissions with information in an electronic almanac, all in order to figure out the receiver's position on Earth.
The first GPS satellite was launched in 1974 and the 24th was launched in 1994. The system is operated by the United States Department of Defense and use of the system is free for anyone. New satellites are periodically launched to replace aging ones. As the technology has improved, the cost of GPS devices has plummeted while the accuracy has increased. Small portable GPS receivers have become very affordable, and the accuracy is amazing. Accuracy varies based on various factors, but it can be as good as a few meters! Land-based supplemental devices can be used to improve accuracy if higher precision is required.
The application of the GPS is very broad, and as the prices come down the number of uses is increasing. Portable GPS devices are used by fisherman and hikers to help them navigate in the wild. Many new cars are being equipped with GPS systems to help drivers with navigation. The military uses GPS to guide cruise missiles to pre-specified targets.
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