Trimble SPSX51 User Manual

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5     Setting up the Receiver
52     SPSx51 Modular GPS Receivers User Guide
The Moving Baseline RTK positioning technique
In most RTK applications, the reference receiver remains stationary at a known 
location and the rover receiver can move. However, Moving Baseline RTK is an RTK 
positioning technique in which both reference and rover receivers can move about. 
Moving Baseline RTK is useful for GPS applications that require vessel orientation.
Figure 5.6
Vessel heading from Moving Baseline RTK 
With Moving Baseline RTK, the reference receiver broadcasts Compact Measurement 
Record (CMR) data, while the rover receiver performs a synchronized baseline solution 
at 10 Hz. The resultant baseline solution has centimeter-level accuracy. To increase the 
accuracy of the absolute location of the two antennas, the Moving Reference receiver 
can use differential corrections from a static source, such as a shore-based reference 
station.
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