Figures 5-4. PDOP Versus Time Plot
PART E - CONDUCTING PRECISE-POSITIONING
5-33. General. This section presents guidance to field personnel performing GPS-Ss for all types of
projects. The primary emphasis in this section is on static and kinematic carrier phase DGPS
measurements. The following are some general GPS field procedures that should be performed at each
station, observation, or session on a GPS-S.
a. Receiver Setup. GPS receivers should be set up according to manufacturers' specifications
before to beginning any observations. To eliminate the possibility of missing the beginning of the
observation session, all equipment should be set up with power supplied to the receivers at least 10
minutes before to the beginning of the observation session. Most receivers will lock on to satellites
within 1 to 2 minutes of power-up.