NavCom RT-3020 Rev.D - Manual (Page 51)

RT-3020 User Guide - Rev. E
the pseudo-random code generated by GPS satellites. It
is intended for civilian use and the accuracy of readings
using this code can be degraded if
selective availability
( S/A ) is introduced by the US Department of Defense.
COM# shortened form of the word Communications.
Indicated a data communications port to/from the
GPS
sensor to a controller or data collection device.
controller a device consisting of hardware and software
used to communicate and manipulate the I/O functions
of the
GPS sensor.
Compact Measurement Record (CMR) a standard
format for
DGPS corrections used to transmit
corrections from a reference station to rover sensors.
data files files that contain Proprietary,
GPS , NMEA,
RTCM, or any type of data logged from a GPS receiver.
datum A reference datum is a known and constant
surface which can be used to describe the location of
unknown points. Geodetic datums define the size and
shape of the earth and the origin and orientation of the
coordinate systems used to map the earth.
DB9P a type of electrical connector containing 9
contacts. The P indicates a plug pin (male).
DB9S a type of electrical connector containing 9
contacts. The S indicates a slot pin (female).
DGPS see
Differential GPS .
Differential
GPS ( DGPS ) a positioning procedure that
uses two receivers, a rover at an unknown location and
a reference s ation at a known, fixed location. The
reference station computes corrections based on the
t
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