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C
RTK Mapping 8
Warning – If you are using a 4400 Site Surveyor receiver, a GPS Total
Station 4700 receiver, or a GPS Total Station 4800 receiver as the rover, it
can automatically detect which signal is being broadcast. If you are using
a Series 4000 receiver as the rover, you must configure the same
message type at both the base and the rover, otherwise messages are not
received by the rover.
CMR
A Compact Measurement Record (CMR) is the most efficient message
to broadcast as it is very compact. CMR only supports RTK data
collection; you cannot use it to provide corrections for real-time
differential data collection (such as when using a Pro XR).
All Trimble Series 4000, 4400, and 4800 receivers support CMR
records. This is the default setting in the Asset Surveyor software.
RTCM 2.1
The Radio Technical Commission for Maritime Services (RTCM) 2.1
message is a less compact message that contains an RTCM SC-104
format message with an embedded CMR message. As a result of this,
a single RTK base station could be set up to provide real-time
correction messages for simultaneous RTK and real-time differential
data collection. Therefore, rovers that receive RTCM 2.1 messages
can collect either RTK or real-time differential data by setting the RTK
mode in the software appropriately.
In the Asset Surveyor software, select Configuration / GPS rover
options / Positions filters.
Note – Your receiver must have the RTCM output option installed in
order to use RTCM 2.1.
TSC1 Asset Surveyor Operation Manual 191