GPS Survey Equipment GPS Trimble R 6 or
GPS Survey Equipment • • GPS Trimble R 6 or R 8 Legs+Bipod Controller* Base Station or VRS Competencies #1 -5
GPS Survey Equipment
GPS Survey Equipment • How GPS works with satellites Competencies #1
Position Dilution of Precision (PDOP)
Sources of Error • GPS receivers clock accurate to 10 nanoseconds • Signal travels at ‘c’ • Atmospheric Disturbances • Reflections • time drift
GPS Survey Equipment • Satellites send timestamp signals to Earth • 3 satellites required for horizontal • 4 satellites required for vertical • 5 th is required for survey grade Competencies #1
GPS Survey Equipment • Why need phone? Competencies #1
GPS Survey Equipment • Rover plus base station • Why need phone Competencies #1
KYCORS Network
GPS Survey Equipment • Horizontal-Total Station accuracy about the same • Vertical- Total Station generally more accurate Accuracy if not fixed • Does not work properly without “sky” • PDOP, Satellites Competencies #1
Competencies #1
GPS Survey Equipment GPS Equipment Special Issues • Site Calibration • Once per Job • Minimum # control points • 2 big settings • Observed Control Point • Fast shot- Topo • Can’t get close to building (15 degree rule) Competencies #2
Competencies #2
Vertical References
Earth’s Geoid
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