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I have a GPS module with an accuracy of 1.5m + 1 ppm.

Query: What is meant by 1 ppm accuracy, what does it symbolize?

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    \$\begingroup\$ Could you provide a link to a datasheet? \$\endgroup\$ – Peter Karlsen Feb 20 at 7:28
  • \$\begingroup\$ ppm is part per million, it is a fractional error bound if no units are obvious. In this case like Spehro says below it refers to the distance to the true or visualised differential base station. \$\endgroup\$ – KalleMP Feb 20 at 22:36
  • \$\begingroup\$ In all the GPS module datasheet you can find that term \$\endgroup\$ – Puneeth Feb 21 at 11:42
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That's a specification used in differential GPS, ppm refers to the added error as a proportion of the distance from the base station.

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  • \$\begingroup\$ Means if I move 2km from base station then added error will 2km* 1? \$\endgroup\$ – Puneeth Feb 21 at 11:43
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    \$\begingroup\$ 1ppm of 2km is 2mm. \$\endgroup\$ – Spehro Pefhany Feb 21 at 11:46

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