Spectra Precision ProMark 800 Reference Manual - Manual (Page 85)

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Chapter 5. RTK Implementation
Data Link
In an RTK surveying system, the data link is used to transfer
RTK correction data from the base to the rover.
The data link may be one of the following two types:
• Standalone: You will have full control over the generation
and transmission of RTK correction data (Spectra
Precision equipment used in base/rover configuration).
• Network-based: You will be resorting to a third-party,
network-based provider for the generation and delivery of
RTK correction data (Spectra Precision equipment used in
rover-only configuration)
This section introduces the two basic transmission means
available in Spectra Precision surveying systems for setting
up this data link:
• Radio (standalone)
• Cellular mobile communications (cell phone, cellular
modem).
For mobile communications, this section describes the
different operating modes available:
• CSD (standalone)
• NTRIP (network-based)
• Direct IP (network-based).
Key Terms and
Expressions
Age of Corrections: The age of corrections is measured as the
time elapsed between the time corrections are generated in a
base and the time when they are effectively used to yield an
RTK position in a rover. Generally speaking, the quality of
corrections decreases as their age increases.
CDMA: A standard for mobile communications based on
CDMA (Code Division Multiple Access) technology. CDMA is
mostly found in the United States, Canada, and North and
South Korea.