.Ahmed Surv...... RTK
GPS DGPS :
( ) , .
Selective Availability - - . - - . - 100%- 30 . Selective Availability 2001 ( ) 1985 .
- Multi Path noise interference DOP
( ) RTK
Real-Time Kinematic
Telemetry Data Link /
DGPS & RTK
RTK dual frequency DGPS single frequency
RTK
RTK DGPS 1
: . -