GPS vs GNSS: What's the Difference and How They're Used
Global Navigation Satellite Systems (GNSS) and Global Positioning Systems (GPS) are two of the most commonly used navigation systems in the world today. While the terms GNSS and GPS are often used interchangeably, they are not exactly the same thing. In this article, we will take a closer look at the differences between GNSS and GPS and how they are used.
What is GPS?
GPS, or the Global Positioning System, is a satellite-based navigation system that was developed and is maintained by the United States government. It consists of a network of 31 satellites that orbit the Earth and transmit signals that can be picked up by GPS receivers. The receivers use these signals to determine their location, velocity, and time.
GPS was initially developed for military use, but it has since become widely available for civilian use. Today, GPS is used for a variety of applications, including navigation for vehicles, smartphones, and other devices, mapping, and surveying.
What is GNSS?
GNSS, or Global Navigation Satellite Systems, is a term that encompasses all global satellite navigation systems, including GPS. In addition to GPS, there are several other GNSS systems currently in use or under development, including the European Union’s Galileo, Russia’s GLONASS, and China’s BeiDou.
Each GNSS system consists of a network of satellites that orbit the Earth and transmit signals that can be picked up by GNSS receivers. The receivers use these signals to determine their location, velocity, and time. By combining signals from multiple GNSS systems, GNSS receivers can achieve higher accuracy and reliability compared to using a single system.
Differences between GPS and GNSS While GPS and GNSS are similar in many ways, there are some key differences between the two. Here are some of the most notable differences:
Number of satellites: GPS consists of 31 satellites, while GNSS encompasses several different systems, each with a different number of satellites.
Ownership and control: GPS is owned and controlled by the United States government, while GNSS encompasses several different systems, each with its own ownership and control structure.
Availability: GPS is available worldwide, but its signals can be affected by factors such as atmospheric interference, terrain, and urban canyons. GNSS, on the other hand, offers more widespread coverage and is less affected by these factors.
Accuracy: GPS is generally considered to be accurate within a few meters, while GNSS can offer even higher levels of accuracy by combining signals from multiple systems.
Conclusion
In conclusion, GPS and GNSS are both systems used for navigation and positioning. GPS is a specific system developed and maintained by the United States government, while GNSS is a term that encompasses all global satellite navigation systems, including GPS. By combining signals from multiple GNSS systems, GNSS receivers can achieve higher accuracy and reliability compared to using a single system.
