Dilution of Precision (DOP)

An indicator of the quality of a GNSS position. It takes account of each satellite's location relative to the other satellites in the constellation, and their geometry in relation to the GNSS receiver. A low DOP value indicates a higher probability of accuracy. Standard DOP indicators for GNSS applications are:

  • GDOP - Geometric (three position coordinates plus clock offset in the solution)
  • PDOP - Position (three coordinates)
  • HDOP - Horizontal (two horizontal coordinates)
  • VDOP - Vertical (height only)
  • TDOP - Time (clock offset only)
  • RDOP - Relative (normalized to 60 seconds)

See also Geometric Dilution of Precision (GDOP), Horizontal Dilution of Precision (HDOP), Position Dilution of Precision (PDOP), Relative Dilution of Precision (RDOP), Time Dilution of Precision (TDOP), Vertical Dilution of Precision (VDOP).