Chapter 4
Configuring System Settings
Setting up GNSS
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CX300 ComXpert Operation Manual
Rev. 001
4.5.1 Checking GNSS results
Confirm the following information is displayed on the
GNSS screen
:
•
Latitude (deg): Distance north or south of the equator, measured in degrees
ranging from 90° to +90°.
•
Longitude (deg): Distance east or west of the prime meridian, usually measured in
degrees ranging from 180° to +180°, which runs from the North Pole to the South
Pole through Greenwich, England.
•
Altitude (m): Height above Ellipsoid (HAE). The height coordinate determined
from GPS observations is related to the surface of a Reference Ellipsoid
(WGS84).
The coordinates are derived initially in the 3D Cartesian system (as XYZ values), and
then for display/output purposes they are transformed to Latitude, Longitude, and
(Ellipsoidal) Height using a well known formula to an ellipsoid, such as that
associated with the WGS84 Datum (semi-major axis: 6378137m; inverse flattening:
298.257223563).
The surface of the ellipsoid is the zero ellipsoidal height datum. In Relative
Positioning, the height component of the receiver whose coordinates are being
determined relative to the Base Station, can also be related to an ellipsoid by
transforming the baseline vector from the 3D form (DXDYDZ) to a change in
Latitude, change in Longitude, and change in Ellipsoidal Height.
•
Lock Status is indicated by the
GPS Indicator button.
“GNSS Lock Status”, on page 3-21
).