It is very necessary to locate your as well as your destinations’ positions, which helps you prevent from losing. Currently, almost all vehicles and technology devices such as planes, submarines, cars, smartphones and more include GPS navigation devices integrated with the GPS signals to pinpoint location.
What is GPS?
GPS (Global Positioning System) is a satellite-based navigation system that enables users to locate their geography positions. This operates based on 27 well-spaced satellites ( 3 spare satellites) moving on the Earth’s orbit. These satellites are located at suitable positions in order to allows to see at least four satellites any when and anywhere on the Earth’s surface.
They transmit signals including their positions and time information. The mission of GPS receiver is to determine four satellites’ locations and calculate the distance between it and satellites. As a result, it can define its position itself following the formula: Distance = Speed x Time.
Global Positioning System is one of the most important system in all countries worldwide. It not only offers a wide variety of useful features to help countries improve national security, but also does it have an effective contribution in transportation.
GPS on smartphones and vehicles
Currently, cell phone manufacturers such as Apple, Samsung, Blackberry, Windows Mobile Phones designed many products integrated with GPS software. This app allows your smartphone to become a navigating device as well as an information bank helping you supervise other people’s activities. Therefore, you will define your relatives’ positions and conveniently take care of them. You can easily install a free GPS application for your phone. When moving on roads by motorbike, GPS app can help you determine your destinations with ease and high accuracy, especially on strange streets. In addition, GPS app is available on most of car types, therefore, you will definitely have comfortable and safe travels on your car.
The principle to determine position by GPS
GPS’s operating principle is to define the intersection of three spherical surfaces in 3D space. The GPS receiver calculates the space between device and a satellite to determine its position on this satellite’s spherical surface. First two surfaces intersect and create a circle. The third one meet this circle at two points, one of which is GPS reviver’s location.
The fourth satellite is important to enhance accuracy of determining time information because extremely tiny difference between satellite watch and receiver can lead to very serious discrepancy in locating.
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Reference articles from Wikipedia