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Glossary-10 Acutime 2000 Synchronization Kit User Guide
Glossary
range A term used to refer to the distance radio signals can travel
before they must be received or repeated due to loss of
signal strength, the curvature of the earth and the noise
introduced because of moisture in the air surrounding the
earth's surface.
range rate The rate of change of range between the satellite and
receiver. The range to a satellite changes due to satellite and
observer motions. Range rate is determined by measuring
the Doppler shift of the satellite beacon carrier.
read-only memory Memory whose contents can be read, but not changed.
Information is placed into ROM only once. The contents of
ROM are not erased when the system unit's power is turned
off.
relative
positioning
The process of determining the vector distance between two
points and the coordinates of one spot relative to another.
This technique yields GPS positions with greater precision
than a single point positioning mode can.
rise/set time The period during which a satellite is visible (i.e., has an
elevation angle that is above the elevation mask). A satellite
is said to "rise" when its elevation angle exceeds the mask
and "set" when the elevation drops below the mask.
ROM Read-Only Memory.
RTCM Radio Technical Commission for Maritime Services.
Commission that recommends standards for differential
GPS services. RTCM Recommended Standards For
Differential GPS Service, prepared by RTCM Special
Committee No. 104 (RTCM SC-104), defines a
communication protocol for sending GPS differential
corrections from a differential reference station to remote
GPS receivers.