GPS is the acronym for Global Positioning System: global positioning system.Despite being well known, several people do not know how GPS works.Thinking about it, TechTudo has prepared a tutorial to get all your questions about the device.
When is it necessary to update your GPS?
The GPS works from a network of 24 satellites in orbit close to Earth.These, in turn, exchange signals with your device and, from this, are able to tell you where you are on the surface of the Earth.Not only that, but your speed, direction of your route, altitude relative to the sea and estimates of time and average speeds for you to complete your course.
Technically, GPS satellites are great clocks in space.There are several satellites in orbit that triangulate their position.Within the satellites, there are high-precision atomic clocks (delaying 1 second every 100,000 years) that record the time a signal is sent to Earth and give the time difference that the signal emitted in response by your device leads to to arrive.It is this time, monitored by several satellites, which allows the system to accurately point the exact point where you are on Earth.
How to locate a cell phone via GPS? Find out in the TechTudo Forum.
GPS and Einstein:
There is an interesting detail: GPS clocks are proof of Einstein’s Theory of Relativity.Because they are far from the center of the Earth, and therefore suffer less influence from gravity, time passes faster for satellites than for clocks of GPS devices on Earth.The difference is because the Earth with its mass deforms the space-time around it.In addition, they move at 14,000 km / h, and this slows them down: the difference between these two faces of relativity is that, by day, the days of the satellites pass 39 millionths of a second more slowly.
It’s a matter of ridiculously small fractions of a second, but that in terms of geolocation can make a big difference, especially if you move quickly.If it were not for Einstein, and the GPS would have needed kilometers, not meters – it would be 11 kilometers more inaccurate per day.This difference, of course, is calculated so that it does not interfere with the results.
How does triangulation work?
Three satellites are needed to point your position – and one more for altitude relative to sea level.Let’s say you are in São Paulo, in the Anhangabaú Valley.There are three satellites that are on the visible horizon.One of them in transit on the south of Brazil, another on the Atlantic and a third on the northeast.Each of them will communicate with their receiver, mapping the response times.The times recorded on each satellite give their exact position.
In our example, the southern satellite tells us that you are 700 kilometers away.The satellite in the Atlantic calculates the distance to you in 1500 kilometers and the satellite in the northeast estimates 800 kilometers.There is only one point in the space from where these three distances can arise to find each of the satellites, and this is where you will be.
Maps and data
But on the screen of your device appears a map.The mapping system data is independent of the GPS system orbiting our heads.These maps are developed by companies and are just a layer of data where you can locate with ease.For example, if you are on an island off the coast of Brazil, your GPS will hardly have information on the screen and the information will show you at sea.Without the graphical maps, you would not have information about the streets, roads and locations.You would only know that it is at so many degrees of longitude and latitude, which is quite vague in the urban use of the system.
The service can be extremely useful in the most varied situations, and can be used on land, in the sea or in all areas of aviation, by professionals.In addition to being essential for some work camps, it is also very useful for the average user who wants to get a location.
On trips, or even in places you do not frequent in the city where you live, the device will help you not only get lost on the way, but also find the simplest route to reach your destination.
GPS models are the most varied.It ranges from those aimed at aviation professionals, for example, to specific models for cars and smartphones.There are also several brands aimed at the device, such as Garmin and NavCity , for example.
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