DGPS Survey

Differential Global Positioning Systems Survey

DGPS Survey achieves higher positional accuracy by making use of the differential capabilities of two GPS antennas linked by a radio signal. We use latest and efficient differential GPS equipment or DGPS instrument for DGPS survey procedure.

Differential GPS working principle is:

• Distance from minimum 4 satellites determines position,
• Signal travel time from satellite to antenna determines the distance
• Calculation by base station is difference between the specified coordinates of its location and those indicated by the satellites,
• This difference continuously broadcasts a signal to the DGPS receiver or rover by the station,
• This same difference accurately determines its location by the rover.

DGPS Advantages:

• Real time data,
• 3D survey results,
• 24 hours availability,
• Worldwide coverage,
• Not affected by cloud cover, & Higher accuracy.

DGPS Applications:

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