What is GPS? -How does it work and how many types?


GPS or Global Positioning System is a global navigation satellite system developed by the United States Department of Defense. This system started functioning completely from 24 April 1955. In the present time, the use of GPS has begun on a large scale.

Nowadays, on every mobile, you get to see the option of GPS in most smartphones, it is also known as the location. We use it to know that by keeping it on, we get accurate information about our site.

Now let’s talk about what is this GPS, and how does it work?

GPS – Global Positioning System

GPS – Global Positioning System is a satellite-based navigation system that provides information such as location and time. The system was created by the Department of Defense of the United States, which is used to accurately identify the micro weight signals of the 24 and 32 medium earth orbit satellites. Along with GPS location and time, it is also useful to tell the weather of any place throughout the day.

How does GPS work?GPS works with receivers that calculate data received from the satellite. The calculation is called triangulation, where the position is detected with the help of three satellites at least once. Locations are indicated by longitude and latitude. It is right in the range of 10 to 100 meters. Different applications and software are used by them according to this, like telling a user the direction of a place. A 2D (longitude and latitude) position of a GPS receiver with at least three satellites is detected. At least four satellites have to be resorted to locating 3D (which includes altitude) positions. Once all these are identified, and the GPS receiver is synced to the moon, other information such as speed, distance, and time is taken to reach a place is also calculated.

GPS lockingFrom this, the exact location of anything is found. GPS depends on the tracker speed. For example, if someone is driving, the accuracy will be less, and it will also take time to find the correct location. GPS locking depends on how the GPS receiver is started. It happens in three ways – hot, warm, and cold.

Hot Start –

If the GPS knows its last position and the satellite as well as the UTC, it uses the same moon to detect the new location according to the information available. This function also depends on your position. Tracking happens very quickly if the GPS receiver is in the vicinity of the previous location.

Warm start-

In this, the GPS receiver remembers the old information in addition to the previous GPS satellite. Thus, the receiver resets all the data and uses the satellite signal to find a new position. Although it considers the moon, it gets to know the satellite soon. It is slower than the hot start but not the most time-consuming.

Cold Start –

In this situation, there is no information, so the device starts to find all the info like GPS satellite, position, etc. Therefore, it takes a lot of time to know its location.

Use of GPS 

GPS was first used only in the military, but later it was also started for the use of ordinary people. And since then, it has started being used in many places.

GPS is used in many places, including astronomy, cartography, automated vehicles, mobile phones, fleet tracking, geofencing, geo-tagging, GPS aircraft tracking, disaster relief, emergency services, navigation of vehicles, robotics, tectonics.

Types of GPS in the Mobile Phone Industry

A-GPS (Assisted GPS)- Such GPS is used to reduce the starting time of a GPS-based positioning system. A-GPS helps the receiver lock when the signal is weak. To do this, however, a network connection is also required in mobile phones as A-GPS uses an assistant server.

S-GPS (Simultaneous GPS) -This approach is adopted to improve satellite-based reporting for a network carrier. S-GPS itself gives both GPS and voice data to the mobile phone at the same time. With this, network providers are able to provide location-based service.

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