GNSS vs GPS: The Difference, and Which Is More Accurate
By Antonio Liska • • Updated
GPS is one global navigation satellite system, or GNSS. Galileo, GLONASS and BeiDou are others. A receiver that uses more than one of these systems is called a multi-constellation receiver.
What is the difference between GPS and GNSS?
GPS names the U.S. satellite navigation system. GNSS is the broader category that includes GPS and the other global systems. Calling a receiver “GNSS” does not, by itself, tell you which systems or signals it supports.
Does using more systems improve accuracy?
A compatible receiver can use satellites from several systems, giving it more signals to work with. The result still depends on the receiver, satellite geometry and conditions at the site. Buildings and trees can block signals, while reflected signals can introduce errors.
More satellites do not guarantee a particular accuracy. For survey work, check the receiver’s specifications and the correction service or base station you plan to use. Then verify the results under the conditions your job requires.
What should you check before choosing a receiver?
- Does it support the satellite systems and signals your work needs?
- Is it compatible with your corrections, field software and equipment?
- Can you verify the required accuracy at your site?
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