gps accuracy precision
what will be the accuracy (precision ) while measuring distance with the aid of GPS?
There is a saying in some GPS companies: “Accuracy is a function of price”
A consumer GPS that you could buy in any store will normally be accurate to between 2 and 5 meters.
If you are in north America and can see a WAAS satellite(or EGNOS in Europe) then it’s going to be closer to 2 meters than 5.
A high end GPS running stand alone and tracking WAAS can give positions accurate to less than 1 m but would probably cost you in the $3,000 – $4,000 region.
If you then go back home and run that data through a computer and compare it with data downloaded from public base stations in the area you can get the accuracy down to 30 cm or so. (Add another few $k for the software to do that).
If you were to go dual band with a cell phone or other link to the internet then about 20cm is possible in real time from a stand alone unit.
After that you are talking survey grade RTK GPS systems and prices in the tens of thousands of dollars. But that way you can get accuracies in the 1-2cm region in real time.
