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Chapter 12. Precise Surveying - Field Applications
& Concepts
Introduction to Precise Surveying
Key Terms and
Expressions
GNSS precise surveying relies on the use of specific
algorithms involved in the processing of carrier phase
measurements. Centimeter precision obtained in precise
surveying results from the successful processing of these
measurements.
Carrier phase measurements are derived from the signals the
surveying equipment receives and decodes from the visible
GNSS + SBAS constellations.
There are two different ways of implementing the processing
algorithms, each of them defining a specific family of
surveying method:
• RTK real-time surveying.
• Post-processed surveying
This chapter introduces the basics of the two surveying
methods.
Note that all Magellan RTK-capable receivers can
intrinsically be used for post-processed surveys. With these
receivers, post-processed surveying can be used either as a
backup method or as an excellent source of comparison for
checking your real-time survey results.
Carrier: Refers to the electromagnetic wave carrying signals
transmitted by satellites (cf. L1 and L2 carriers).
Carrier phase measurements: Refers to measurements
performed by a receiver from the received signals to
determine the phase of the carrier at the receiver location.
CPD: Carrier-Phase Differential. An acronym that refers to the
processing of carrier phase measurements.
Fixed (solution): Status of the position solution once RTK
operation is effective and centimeter-level precision is
assumed to be achieved.
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