Lassen SQ, Reference Manual

Page: 185 / 196

Lassen SQ GPS Receiver 1 7 1
Glossary
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. 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
Refers to a mathematical model of the earth. Many local
datums model the earth for a small region: e.g., Tokyo datum,
Alaska, NAD-27 (North America). Others, WGS-84, for
example, 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 Lassen SK II
GPS sensor is shipped with factory default configuration
settings; the settings were determined by Trimble Navigation.
DGPS see differential GPS
DGPS reference
station
A device that tracks all GPS satellites in view, periodically
performs inter-channel calibrations, and calculates and
transmits differential corrections.
differential
capable A term used to describe a GPS receiver that is capable of
receiving and applying differential GPS corrections.