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Z-Max Surveying System Operation and Applications Manual
RTCM:
the data transmitted will be in the RTCM-104 version 2.3 format. The
RTCM format has a number of message types that are used with RTK and
DGPS. The message types for RTK are Type 18/19 and Type 20/21.
CMR:
Compact Measurement Record or CMR format is a non-proprietary
RTK format that uses data compression techniques to reduce the bandwidth
required to transmit RTK data from the base to the rover receiver. In other
words, the amount of data that must be transmitted on the data link to perform
RTK operations is less with CMR than with other formats. There is also an
enhanced format called CMR+.
The default data format in the base station is DBEN. To select another data format,
use either the base station configuration in the FAST Survey handheld computer
software or the PORT/TYPE submenu in the front panel display.
The rover by default will accept either DBEN or CMR message formats, no additional
settings are necessary. To set the rover to receive RTCM messages, use either the
rover station configuration in the FAST Survey handheld computer software or the
PORT/TYPE submenu in the front panel display.
NOTE: The Z-Max rover receiver will also accept DSNP format output by other Thales Navigation
receivers. The Z-Max does not transmit DSNP format.
RTK Positioning Modes
The Z-Max RTK System is designed to be flexible and robust over a number of
different conditions. The firmware comes equipped with RTK algorithms that will
compute an RTK position with only a single epoch in certain conditions, as well as
those that will compute RTK positions over distances of up to 50 kilometers. The
receiver will automatically determine the correct algorithm to use given the current
conditions. As a user, there is nothing that must be done to take advantage of these
performance-enhancing modes.
The only RTK mode that you need to be aware of is the RTK positioning mode. The
RTK positioning mode you choose will determine the available frequency of position
output, and will also have some effect on the accuracy of the position. The RTK
positioning mode is selected in the rover receiver and can either be set in the Field
Application software or via the front panel display. There are two available modes:
•
Synchronized RTK (1 Hz and 5 Hz); and
•
Fast RTK
Synchronized RTK (also called matched time tag RTK or Fine Positioning) will
compute and output one rover position for each epoch of base station data that has
been received. Fast RTK (also called Coarse Positioning or Fast CPD) works by
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