RTK Survey Preparation
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System Guide to R
T
K Surveying
logging, the user sets a ‘Time To Stay’ parameter in seconds. RTK data logging is
initiated by entering a Site ID. The receiver will collect data at that point for the
duration set in the ‘Time To Stay’ parameter. After data collection has stopped, the
Site ID will automatically increment by 1, and RTK data logging continues upon
confirmation of the Site ID. To automatically increment the last character of the
Site ID must be numeric.
TRAJECTORY
: Trajectory logging is ideal for setting stakeouts, or other surveys
where data is collected at fixed distance intervals. In Trajectory logging, the user
sets a ‘Distance Interval’ parameter in meters. RTK data logging is initiated by
entering a numeric Site ID. As the user traverses across the site, the receiver will
monitor the distance covered and collect data at each interval set in the Distance
Interval parameter. The Site ID will automatically increment each time RTK data is
logged to the receiver.
RTK Position Output
The output rate of RTK positions is controlled by the Recording Interval parameter in
the rover receiver. As we discussed in the Positioning Modes section, the maximum
output frequency is higher when in Fast RTK (Coarse positioning) mode than with
Synchronized RTK (Fine positioning) mode. The maximum output rate is also directly
affected by the firmware options that are set.
• If the [F] option is enabled and the receiver is in Fast RTK mode, output
can be set from 0.1 – 999 seconds.
• If the [H] option is enabled and the receiver is in Synchronized RTK mode,
then the RTK output can be set from 0.2 – 999 seconds. Remember that in
Fine positioning mode, the output of the rover will equal to the
transmission rate of the base receiver. So to output RTK positions at 0.2
seconds, the base must be transmitting at 0.2 seconds.
Base Station Position
Remember that the computation of the rover position is relative to the base position.
Since the rover receiver performs the position calculation, it must know the
coordinates of the base point to accurately compute the rover position. Any
inaccuracy in the base station position is transferred to the computed rover position.
Most frequently, the base station will occupy an accurately known position. That
known position is entered into the base receiver. However, it is possible to perform an
RTK survey using an unknown point as the base station using approximate
coordinates determined by the base receiver.
G3.book Page 221 Saturday, May 24, 2003 12:52 PM
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