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Precise Surveying - Field Applications & Concepts
RTK Surveying
Key Terms and
Expressions
292
GNSS: Global Navigation Satellite System. GPS, GLONASS
and the future Galileo are each a GNSS.
SBAS: Satellite Based Augmentation System. A wide-area or
regional system composed of geostationary satellites
providing GNSS augmentation, that is a method of improving
locally the performance (i.e. accuracy, reliability, availability,
etc.) of a GNSS.
RTK (for Real-Time Kinematic) is a surveying method through
which you ask the rover equipment to quasi-instantly
determine the coordinates of your current location with
centimeter precision.
This section describes the implementation rules common to
all surveys performed with the RTK method and presents the
three basic field applications:
• Logging points.
• Logging points in continuous mode (trajectory).
• Staking out.
Depending on the software application installed in the field
terminal, more field functions may be available, like for
example for road construction or civil engineering. These
additional functions are all derived from the capability of the
system to perform one of the three basic functions described
in this section.
Baseline: Distance between the base antenna phase center
and the rover antenna phase center (see also GNSS Antennas
and Antenna Heights on page 313). Fundamentally, the
surveying system is used to determine all the components of
the vector formed by the baseline.
Base/rover configuration: Refers to an RTK surveying system
consisting of a base and a rover. As opposed to a rover-only
configuration, this system is autonomous in the sense that
the surveyor has full control over the base data sent to the
rover.
Constellation: Set of GNSS satellites visible from a given
observation point on the Earth.
Data Link: Communication means allowing transfer of RTK
correction data from a base to a rover.
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