FASTRAK MANUAL
Rev. G
37
JUNE 2012
‘A’ – Alignment Reference Frame
Syntax:
A
station
,[Ox],[Oy],[Oz],[Xx],[Xy],[Xz],[Yx],[Yy],[Yz]<>
or
A
station
<> to read back the current alignment
Purpose:
The alignment command does two things. It defines a reference frame to which all
position and orientation output data is referred. In addition, it creates a new origin
point where the X, Y, Z measurements would equal 0,0,0 if the receiver were
placed there. See
on page
. An example of where this command
would be useful is a sloped test surface that the user wanted referenced to the
transmitter. This would obtain congruence between the FASTRAK and the axes
of the sloped surface.
NOTE:
This command operates incrementally. If the command is entered and the
user then decides to change it, the
‘R’ – *Reset Alignment Reference Frame
) must be used to reset the alignment reference frame
BEFORE
the command is re-entered. This is
ESPECIALLY IMPORTANT
to
remember if the user makes an error and wants to correct the erroneous input
because the new alignment would be additive to the mistake. The command
parameters are:
station
1 to 4, which specifies the relevant transmitter/receiver pair.
Ox,Oy,Oz
the Cartesian coordinates of the origin of the new reference frame.
Xx,Xy,Xz
the coordinates of the point defining the positive direction of the
X-axis of the new reference frame.
Yx,Yy,Yz
the coordinates of a third point that is in the positive Y direction
from the X-axis.
Relatives:
R
Range:
No Range Restriction Enforced
Default:
The transmitter reference frame is the default alignment reference frame.
(0,0,0,200,0,0,0,200,0) in centimeters
Example:
To perform an alignment on station 1, follow the steps listed below:
Standard Alignment Procedure
1.
Send the command R1<>
2.
Place the receiver at the proposed origin location
3.
Press P and write down the X,Y,Z measurements (These will be Ox,Oy,Oz)
4.
Move the receiver along the proposed X axis from the origin defined in step 2
and place it about 24 inches in front of this origin.
5.
Press P and write down the X,Y,Z measurements (These will be Xx,Xy,Xz)