User's Manual

InterSense Doc. No. 072-00105-0I07 Rev. 4.2
IS-900 User Guide Page 38 of 177
3.3. Installation of SoniStrips
In order to install the SoniStrips, you need the following (that are not supplied in the standard IS-
900 System):
1. An optical surveying tool or Total Station. We recommend a Nikon DTM 420 or equivalent for
measuring absolute X, Y, and Z coordinates of all SoniDiscs.
Note: If your IS-900 system comes with a fixed constellation frame (SoniFrame or
SoniWing), then the optical surveying equipment is not needed.
2. A Windows PC capable of running the latest version of ISDEMO (check
www.intersense.com/downloads.aspx
for current version).
General Guidelines
The position of a SoniDisc is defined as the coordinates of the center of the grill covering the
speaker. When measuring the position of each SoniDisc in an installed Constellation Array, all
values are entered in meters. The coordinates of the SoniDiscs are entered in a user-defined,
locally leveled coordinate frame. The coordinate system is right-handed with X pointing forward,
Y to the right and Z pointing down. Position data for all stations is computed relative to that
coordinate system.
SoniStrips come in 0.6, 1.2 or 1.8 meter (2, 4 or 6 foot) lengths. The 2-ft. SoniStrip has two
SoniDiscs per SoniStrip and the 4-ft SoniStrip has 3 SoniDiscs installed with each SoniDisc
spaced at 0.61 m (2 foot). The 6-ft SoniStrip has 3 SoniDiscs with each spaced at 0.91 m (3 foot)
spacing. For best performance, it is generally recommended that SoniStrips be installed in a
regular grid over the tracked area. Total distance from a SoniDisc in the Constellation to a
tracked station should not exceed 3.0 meters (10 feet) to guarantee good signal detection (4
meters with external power boosters installed).
IS-900 default configuration does not contain a Constellation, so it is up to the user to configure it.
To properly track, the system needs to know the position and orientation of each of the SoniDiscs
in the Constellation with high degree of accuracy. The best way to measure position of each
SoniDisc is with the use of an optical sighting tool known as a Total Station. The quality of the
measured position data input for the SoniStrip Constellation Array is directly proportional to the
accuracy of the IS-900 system’s tracking data output.
A second parameter needed for each SoniDisc in the installed Constellation Array is the unit
normal vector, as shown in Figure 17. The unit normal vector defines the orientation of a
SoniDisc. The default assumption is that the Constellation is installed horizontally over the
tracked area, so the normal vector points straight down with unit normal vector coordinates of 0,
0, 1. The unit normal vector is the same for each SoniDisc on the same SoniStrip. Entering the
correct normal vector for each SoniDisc is important. The normal vector information is used by
the IS-900 tracking algorithm to correctly schedule the polling of each SoniDiscs.
Figure 17 - Unit Normal Vector Definition for Ceiling Installed SoniStrip
Normal vector pointing down
0, 0, 1
SoniStrips
SoniDisc Emitter