DGPS Survey

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The DGPS (Differential Geographic Positioning System) Survey

These are surveys which are carried out using the differential GPS. It achieves higher positional accuracy by making use of the differential capabilities of two GPS antenna linked by a radio signal.

The DGPS Survey main features are:

  • Position is determined by distance from at least 4 satellites
  • Time taken by signal to travel from satellite to antenna used to determine the distance.
  • The base station calculates the difference between the specified coordinates of its location and those indicated by the satellites.
  • The base is continuously broadcasting a signal to the rover of this difference.
  • The rover then uses this same difference to accurately determine it’s location.

DGPS Advantages

  • Higher accuracy (+/-0.045m)
  • Real time data
  • Worldwide coverage
  • 3D survey results
  • 24 hours availability
  • Not affected by cloud cover

DGPS Application

  • Topographic surveys
  • Control establishment and densification
  • Positions, lines and levels setting-out
  • Azimuth determination
  • Collar pick-ups (X;Y;Z)

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