Sokkia RADIAN IS, Operation Manual

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60 RADIAN™IS
Glossary
Phase Center - The phase center of a GPS antenna is the physical
location on the antenna where the raw GPS signals are observed.
This is the physical location where the computed position will
be determined. GPS antennas are manufactured to place the
phase center as closely as possible to the physical center of the
antenna housing. To determine the position of a survey marker
on the ground, the GPS antenna (and thus the phase center) is
centered over the marker and the height of instrument is
measured to the survey marker for use during processing.
Precise Positioning Service (PPS) - the GPS positioning,
velocity, and time service which will be available on a
continuous, worldwide basis to users authorized by the U.S.
Department of Defense (typically using P-Code).
Pseudorange - the calculated range from the GPS receiver to the
satellite determined by taking the difference between the
measured satellite transmit time and the receiver time of
measurement, and multiplying by the speed of light. This
measurement generally contains a large receiver clock offset
error.
Pseudorange Measurements - measurements made using one
of the pseudorandom codes on the GPS signals. They provide an
unambiguous measure of the range to the satellite including the
effect of the satellite and user clock biases.
Raw data - GPS data which has not been processed or
differentially corrected.
RINEX - Receiver INdependent EXchange format. A set of
standard definitions and formats to promote the free exchange
of GPS data and facilitate the use of data from any GPS receiver
with any software package. The format includes definitions for
three fundamental GPS observables: time, phase and range. A
complete description of the RINEX format is found in the
Commission VIII International Coordination of Space
Techniques for Geodesy and Geodynamics "GPSBULLETIN"
May-June, 1989.
Rover - The GPS receiver that moves from site to site during a
kinematics GPS survey. This receiver does not know its position
and needs to receive measurements from a base station to
calculate differential GPS positions.