HD GNSS Correction Data

HD GNSS correction data is used to improve the overall GNSS position estimate accuracy.

The achieved position estimate accuracy depends on the quality of the GNSS measurements. Using GNSS measurements from a good quality dual frequency Android phone allows sub-meter accuracy. Using GNSS measurements from a high precision GNSS module results in accuracy down to 10 cm.

HERE GNSS API provides the following:

  • SSR clock corrections for GPS, Glonass, Galileo and Beidou satellites
  • SSR orbit corrections for GPS, Glonass, Galileo and Beidou satellites
  • ionospheric corrections
  • differential code biases

The format of these data types is described in Data Types / HD GNSS Correction Data.

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