5 Using 3D Guidance in theField
5.1 Introduction
Some systems store a three dimensional (3D) digital map of the design surface in
the control box. Using 3D sensors, the system fixes the location and elevation of the
machine and its bucket focus on this surface. The system then calculates the
difference between the bucket focus elevation and the design elevation.
Systems that have this capability are called 3D guidance systems and use GNSS
receivers, or a UTS (Universal Total Station) instrument, a type of robotic total
station.
5.2 Preparing 3D sensors
Common tasks that you must perform before you can use a UTS system are:
Task When To learn how, see ...
Set up the UTS instrument Every time the instrument is moved or
when a new job is started
5.2.8 Starting the UTS
system
Start UTS positioning When you need to use UTS position
information for guidance
5.2.8 Starting the UTS
system
Bench a UTS target Every time you set up a UTS
instrument and do not know the
instrument elevation, or if you want to
use a benched elevation in preference
to a measured elevation
5.2.1 Benching a UTS
target
Set UTS accuracy
requirements
When you are having problems
establishing a UTS system’s
orientation
5.2.2 Setting the UTS
accuracy level
Initialize machine
orientation
Every time you change the location of
the machine
5.2.3 Initializing single-3D
excavator orientation
Note – In this manual the term GNSS refers to global navigation satellite systems
collectively. Specific constellations are still referred to by their constellation
names, for example "GPS" and "GLONASS".
Common tasks that you may need to perform before you can use a GNSS receiver
system are:
Task When To learn how, see ...
Initialize a GNSS system’s
direction and pitch
Every time you turn on the system,
when a machine using a GNSS
system has been moved with the
system turned off
5.5.6 Re-initializing
orientation after moving
the machine
108 GCS900 GradeControl System for Excavators Operator's Manual
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