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Acutime 2000 Synchronization Kit User Guide Glossary-3
Glossary
C/A code The Coarse/Acquisition code. This is the civilian code made
available by the Department of Defense. It is subject to
selective availability (SA). Users can reduce the effects of
SA by using differential GPS.
carrier The radio signal on which information is carried. The carrier
can be sensed to determine the presence of a signal.
channel Either a single frequency or a pair of radio frequencies used
as a communication path.
chip The length of time to transmit either a zero or a one in a
binary pulse code.
chip rate Number of chips per second (e.g., C/A code = 1.023 MHz).
configuration A set of conditions or parameters that define the structure of
an item. In regards to Placer, a configuration defines the
GPS processing and characteristics of the RS-232 interface
ports. The term configuration can also define the hardware
components that comprise a subsystem or system.
data bits The bits in a byte of data which carry the actual information.
datum A mathematical model of the earth. Many local datums
model the earth for a small region: for example, Tokyo
datum, Alaska, NAD-27 (North America). Others, such as
WGS-84, model the whole earth.
DCE Data Communications Equipment. The equipment that
provides the functions required to establish, maintain, and
terminate a communication connection. Any equipment that
connects to DTE using an RS-232 or CCITT V.24 standard
interface.
default setting A preset or initial value that is assumed to be the preferred
or appropriate selection for most situations. The Placer GPS
sensor is shipped with factory default configuration settings;
the settings were determined by Trimble.