User's Manual

User Guide
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User Guide, WherePort IV D1300 REV A
© Copyright WhereNet, Corp. 2008 WhereNet Confidential
8.0 WHEREPORT IV IN THE FIELD
The basic principles of the WherePort IV must be translated into applications in the field. Doors,
corridors, rooms, parking lots do not necessarily conform to the requirements of the WherePort IV field.
In this chapter several common situations are discussed in order to illustrate how the characteristics of
the WherePort IV affect their positioning on a site.
Figure 71 WherePort IV Coverage
In the applications that follow the WherePort IV field will be illustrated as shown in Figure 71. The
illustration shows only two dimensions of what is always a three dimensional field. The field can be
imagined as a series of waves that are further apart as they move out from the coil. The overall shape is
like an ellipsoid, an egg shaped object, extending out in all directions from the WherePort IV.
In the examples that follow, the WherePort IV field is described. It must be remembered that the capture
area is what is important. The field is shown to simplify the presentation.
8.1. Zones
In some applications it is not necessary to be able to determine the precise position of an asset. All that is
needed is to know when the asset is in one or more key zones of the facility. Fewer antennas are required
to define zones.
While accuracy may not be essential, reliability will be. By placing one or more WherePort IVs in a
zone, the system can reliably determine that a tag asset has entered and is still in a zone.
Uncertaint
y
Covera
g
e
Guaranteed Coverage
WherePort