C-Nav 2050M User Manual - page 147
C-Nav2050 User Guide
Geographical Information System (GIS) is a
computer system capable of assembling, storing,
manipulating, updating, analyzing and displaying
geographically referenced information, i.e. data
identified according to their locations. GIS technology
ositioning System (GPS) geometrically, there
oint to at least four
s
d on
C.
the
.
rmation for the
odetic Network is a network for which
a
can be used for scientific investigations, resource
management, and development planning. GIS software
is used to display, edit, query and analyze all the
graphical objects and their associated information.
Global P
can only be one point in space, which is the correct
distance from each of four known points. GPS
measures the distance from a p
satellites from a constellation of 24 NAVSTAR satellite
orbiting the earth at a very high altitude (approximately
20,200km). These distances are used to calculate the
point’s position.
GPS Time is a measure of time. GPS time is base
UTC, but does not add periodic ‘leap seconds’ to
correct for changes in the earth’s period of rotation. As
of April 2008 GPS time is 14 seconds ahead of UT
Greenwich Mean Time (GMT) is the local time of
0° meridian passing through Greenwich, England
Handover Word is the word in the GPS message that
contains time synchronization info
transfer from the C/A-code to the P-code.
Horizontal Ge
the horizontal, coordinate, latitude, and longitude of the
control points in the network are determined as
accurately as possible, and heights are known only
approximately.
Independent Baseline those baselines that provide
unique position solution for a given station.
G-15