What are features of DGPS (Differential Global Positioning System)?

  • To overcome the disadvantages of accuracy denial.
  • Systems are totally automatic.
  • Improve the accuracy of the GPS fix only in areas where the system operates, typically about 200 nm.
  • Additional equipment must be installed.
  • position updates of 0.5 seconds reported position-fix accuracy of about 1 to 3 metres rms
  • Still dependent upon the supplier of the GPS signals.


ERRORS in calculating  postion by different types of equipments


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