AUTOMATION OF MULTI-POINT CONCURRENT TRACKING FOR PRECISE CONSTRUCTION SURVEYING

basicgratisMechanics

Nov 5, 2013 (3 years and 7 months ago)

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AUTOMATION OF
M
ULTI
-
P
OINT
C
ONCURRENT
T
RACKING
FOR PRECISE CONSTRUCTION
SURVEYING




*S. Mao
1
, M.F. Siu
1
, M. Lu
1
, X.S. Shen
1

and
U
. Hermann
2


1
University of Alberta

Department of Civil and Environmental Engineering

Edmonton, Alberta, Canada

(*Corresponding

author: mao1@ualberta.ca)


2
PCL Industrial Management Inc.

Edmonton, Alberta, Canada



ABSTRACT


Total station is one of the most reliable surveying equipment in construction industry, which can deliver
rapid surveying with accuracy within two millimeter
s
. Traditionally, three major factors l
imit

application of total
station: only one target can be observed for a moment; line
-
of
-
sight is critical; and dynamic targets cannot be
tracked efficiently. However, with the
latest

robotic total station (RTS), dynam
ic observation becomes feasible with
automatic prism searching; meanwhile automated control of RTS’s operations can be realized through the
application programming interface (API) provided by the equipment manufacturer.

This paper describes
synchronization

and automation of multiple robotic total stations to address dynamic tracking and mea
surement
problems in the field.
The solution tries to solve problems requiring dynamic and automatic observation, which
can
no
t be achieved
by unsynchronized multiple tota
l stations
.

Concurrency synchronization system shares
mutual
targets, coordinate system, time and surveying delegates among

multiple

RTS through wireless networks. The

proposed new

system can operate two RTS to survey both ends of one swinging sling on the

same moment of time,
retrieving the actual length of the sling within
several
millimeter
s

accuracy

in the crane lifting application
. Besides,
in tunnel surveying,
Multiple
RTS make consecutive observation however line
-
of
-
sight can
no
t be guaranteed all the

time

due to the narrow space and ongoing construction activities
. Multiple
RTS

can
still perform consecutive
surveying

without

intensive

manual intervention; while synchronized, will the blocked total station delegate
surveying job automatically to the pe
ers which are visible to the target.

A field test
-
bed of measuring the length of a
dynamic sling of a rigging framework used for lifting industrial modules is given to demonstrate the
proposed new
automation approach; meanwhile an in
-
lab is also performed
to show blocked sight situation

as a simulation of the
tunnel environment
.
Conclusion
s

are drawn by comparing the new proposed multiple total station synchronization
approach to existing surveying technologies, such as RTK
-
GPS and laser scanning.


KEYWORDS


Robotic Total Station, Dynamic Surveying, Tunnel
ing
, Frame Lifting
, Automation, Tracking Technology