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Based on How Many Satellites the GPS Works

GPS works based on a constellation of satellites that orbit the Earth. These satellites emit signals that are received by GPS devices to determine the exact location of an object or person.

What is needed to make a GPS?

A GPS is a device that uses an integrated circuit to function. This circuit includes digital filters, a real-time clock, a processor, memory, and a GPS engine. The GPS engine is responsible for searching for signals from GPS satellites and calculating the time difference between them. In Figure 2 you can see an integrated circuit model of a NEO6M GPS from the uBlox brand.

How is satellite tracking done?

GPS, which stands for Global Positioning System, is a network of satellites that orbit the Earth. These satellites emit radio signals that are used by GPS receivers installed in vehicles such as trucks and yachts to determine their exact location. Thanks to these GPS tracking devices, it is possible to track the location of a vehicle. These GPS tracking solutions for cars aim to improve security.

How do I know which satellite I am connected to?

An application allows you to know which satellite your phone has connected to and what type of satellites are compatible with it. Additionally, you can carry your driving license on your cell phone if you have not received it yet. You can also locate your vehicles thanks to a GPS tracker. The dual-band GPS on your mobile phone has various uses, such as knowing which satellite you have connected to. With the help of an app like GPS Test, you can verify the connection of your mobile phone to the satellites and know the status of the National Geodetic Network of GNSS Reference Stations. This app also allows you to calculate the heading, know the hours of light and altitude, and see the position of satellites in the sky through a rotating compass.

How many satellites do we need to get the 2D position and why?

GPS satellites orbit the earth twice a day and transmit signal information to the earth. GPS receivers use this information to calculate the user’s exact location through triangulation. The receiver compares the transmission time of a signal with the reception time to determine the distance to the satellite. Using distance measurements from multiple satellites, the receiver can determine the user’s position and display it on an electronic map. To calculate a 2D position, the receiver must be connected to at least three satellites, while for a 3D position four or more satellites are required. Once the user’s position has been determined, the GPS unit can calculate additional information such as speed, heading, travel distance, distance to destination, sunrise and sunset times, among other data.

How do GPS communicate?

Thanks to current technology, it is common to have equipment and services enabled for the GPS global positioning system. These devices, such as computers or mobile phones, allow users to interact daily. Previously, the concept of GPS was considered exotic and used mainly by governments.

GPS is based on a network called the global navigation satellite system GNSS. This network is made up of satellites that continually orbit the Earth at different altitudes and speeds. These satellites constantly transmit a weak radio signal that devices on the ground detect. To determine its position on Earth, a GPS device needs to be in direct view of at least three GNSS satellites at the same time. In the 1970s, navigation satellites were first used for exclusively military purposes by the United States Government. However, in the mid-1990s, its commercial use became widespread. Currently, the GNSS constellation is made up of numerous satellites from different countries.

How many satellites must be within range of a GPS receiver for us to obtain a reliable reading of its position?

The Global Positioning System (GPS) is a terrestrial positioning system that uses a network of 24 satellites in orbit around the Earth to calculate the position of a GPS receiver. Each of these satellites transmits the exact time and its position in space, which allows GPS receivers to calculate their own position on Earth by triangulating the position of the captured satellites. GPS receivers can receive signals from more than three satellites to calculate your position more accurately. However, it is important to note that GPS receivers for civilian use have an accuracy degradation ranging between 15 and 100 meters RMS, due to regulation by the United States Department of Defense. Despite this degradation, GPS receivers are extremely useful for navigation, route tracking, and point storage. They are also used in activities such as cartography, topography and geology. In addition, GPS receivers can be very useful in emergency situations, since they allow the exact position of a person to be provided in the event of an accident. In summary, GPS is a sophisticated but very useful system that allows us to know our exact position on Earth.

What type of signal does a GPS emit?

GPS, or Global Positioning System, is a system developed by the United States Department of Defense that allows obtaining the position at any point on Earth through the use of a receiver that collects the signal from satellites in orbit around the Earth. .

This system has gained popularity due to its ease of use, precision and free use, and is used in various fields such as geodesy, engineering, maritime navigation, outdoor activities and military use.

The NAVSTAR satellite constellation, composed of 31 satellites, 24 of them operational, orbits at a distance of 20,200 kilometers from the Earth’s surface. The project began in 1973 and in 1983 the United States released the GPS system for use throughout the world.

To use the system, it is necessary to have a GPS receiver, although most current mobile phones already incorporate it. The device uses radio frequency waves to communicate with satellites and obtain the information necessary to determine the geographical position on the Earth’s surface.

It is important to keep in mind that GPS requires a clear view of the sky for its correct operation, so it may have difficulty acquiring a signal in places such as buildings or caves.

How does the GPS system work?

The GPS radio navigation system is a service provided by the United States of America that offers free and continuous positioning, navigation and timing to civilian users around the world. Using GPS receivers, users can obtain their exact location and time anywhere and in any atmospheric condition, regardless of the number of simultaneous users.

The GPS system is made up of satellites in orbit around the Earth, ground monitoring and control stations, and user-owned GPS receivers. Satellites transmit signals that are received and identified by GPS receivers, which provide three-dimensional coordinates of latitude, longitude and altitude, as well as precise local time.

Nowadays, portable GPS receivers are available in the market for everyone to use. These devices allow users to accurately determine their location and easily move wherever they want, whether walking, driving, flying or sailing. GPS is essential in all transportation systems, supporting air, land and sea navigation. Emergency and rescue services depend on GPS for location and time coordination of rescue missions. In addition, everyday activities such as banking, mobile telephony and electrical distribution networks benefit from the timing precision provided by GPS. Farmers, surveyors, geologists and many other users work more efficiently, safely, economically and accurately thanks to accessible and free GPS signals.

It is important to note that the use or import of frequency interference devices (jammers) is illegal.


The GPS system works through a network of satellites that transmit signals to receivers on Earth. To make a GPS you need a receiver, antenna and software. GPSs communicate through radio signals. To obtain a reliable position reading, at least 4 satellites are needed. Satellite tracking is performed by receiving and processing signals from satellites. GPS emit radio signals at specific frequencies. To know which satellite we are connected to, you can use software that displays the information. To obtain the 2D position, at least 3 satellites are needed, since triangulation is required.

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