Trimble SCS900 User Manual

Glossary
12 Glossary
benching
Benching is a process of aligning your GPS position (latitude, longitude, and height) to a
benchmark that has been added as a reference point. The calibration offsets your GPS
position to that of the benchmark, improving accuracy and providing a point that you
can return to later.
AutoBase
AutoBase technology uses the position of the receiver to automatically select the
correct base station; allowing for one button press operation of a base station. It
shortens setup time associated with repeated daily base station setups at the same
location on jobsites.
base station
Also called reference station. In construction, a base station is a receiver placed at a
known point on a jobsite that tracks the same satellites as an RTK rover, and provides a
real-time differential correction message stream through radio to the rover, to obtain
centimeter level positions on a continuous real-time basis. A base station can also be a
part of a virtual reference station network, or a location at which GNSS observations
are collected over a period of time, for subsequent postprocessing to obtain the most
accurate position for the location.
DGPS
See real-time differential GPS.
design map
The map that provides live linework within a design for stakeout operations. The design
map is a DXF file.
differential
correction
Differential correction is the process of correcting GNSS data collected on a rover with
data collected simultaneously at a base station. Because the base station is on a known
location, any errors in data collected at the base station can be measured, and the
necessary corrections applied to the rover data.
Differential correction can be done in real-time, or after the data is collected by
postprocessing.
differential GPS
See real-time differential GPS.
elevation (elev, elv)
(1) Vertical distance (height) above or below mean sea level. (2) Vertical distance
above or below the geoid. (3) Distance above or below Local Datum.
elevation mask
The angle below which the receiver will not track satellites. Normally set to 10 degrees
to avoid interference problems caused by buildings and trees, atmospheric issues, and
multipath errors.
feature
A feature is a physical object or event that has a location in the real world, which you
want to collect position and/or descriptive information (attributes) about. Features can
be classified as surface or non-surface features, and again as points, lines/breaklines, or
boundaries/areas.
GLONASS
Global Orbiting Navigation Satellite System. GLONASS is a Soviet space-based navigation
system comparable to the American GPS system. The operational system consists of 21
operational and 3 non-operational satellites in 3 orbit planes.
GNSS
Global Navigation Satellite System.
GPS
Global Positioning System. GPS is a space-based satellite navigation system consisting of
multiple satellites in six orbit planes.
height
It can mean a target height or antenna height ( for example, 2 m of rod height).
Here position
An autonomous instantaneous position derived from the GPS receiver’s uncorrected
Trimble SCS900 Site Controller Software User Guide 120

Trimble SCS900 Specifications

General

Brand	Trimble
Model	SCS900
Category	Controller
Language	English