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Z-Max Surveying System Operation and Applications Manual
Fast RTK
Fast RTK should be used when consistent and high frequency position updates are
required (such as in machine control), and when consistent position accuracy is not
the highest priority. The [F] option must be enabled to perform Fast RTK.
In Fast RTK mode (Coarse Positioning), the rover receiver can output centimeter level
RTK positions at rates up to 10 Hz. Fast RTK works by using a single base station
message to compute multiple rover RTK positions. In this mode, positions are more
independent of the rate at which it receives DBEN, RTCM, or CMR messages from
the base receiver. For example, if the base station is transmitting data at 1 Hz (once
per second), the rover (in Coarse mode) can output up to ten RTK positions at 0.1-
second intervals, using the one base station epoch to compute one matched time-
tagged and nine unmatched time-tagged RTK positions.
The inconsistent accuracy is a function of the latency. If the base station is
transmitting data at 1 Hz (once per second) intervals and rover is computing RTK
positions at 10 Hz (10 times per second), the last RTK position computed before a
new base station epoch arrives will have a latency of almost one full second longer
than the first position. Therefore, the accuracy of the last position is generally lower
than the first position computed after the arrival of base station data. The degradation
of accuracy is very slight (if latency is kept to less than 1 second) and is often
inconsequential for many applications.
One big advantage of Coarse positioning is that RTK will continue to be computed
even if there is a minor interruption in the base station data. Under good conditions,
centimeter-level accuracy can be maintained for data latencies up to 10 seconds. Any
degradation in position, either because of latency or cycle slips can be monitored in
the Field Application software or by using the NMEA RRE message. Because Fast
RTK is running synchronized RTK in the background, any degradation is usually
temporary. Cycle slips are typically fixed at the next synchronized epoch.
RTK Logging Modes
The Z-Max RTK System is designed to operate in one of three logging modes:
Manual, Auto Point, and Trajectory. The logging mode is set in the rover receiver
using the Field Application software or the front panel display. (Logging mode is
referred to as LOG TYPE on the front panel display.)
MANUAL
: In Manual logging, the user initiates RTK data logging by inputting a
site ID and selecting START. The receiver will collect data at that point until the
user selects STOP.
AUTO POINT
: Auto Point logging is ideal when you have a series of closely
related sites that you wish to occupy for a certain period of time. In Auto Point
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