Location Software

The main function of the Wi-Fi Tag is to enable determination of the assets or personnel to which the tag is attached. This is accomplished in several ways - one of which is by the tag transmitting packets at pre-defined intervals in pre-configured channels and transmission patterns. These packets, and information pertaining to them, are forwarded to an appropriate localization infrastructure, which may be located anywhere in the IP network. By using the received signal strength in those packets, location engines residing in the server compute the position and location of the tags. Another method is to have the tags scan for Wi-Fi Access Points in the vicinity and report their identities along with the signal strength measurements of their transmissions to the location server. Here, there is no dependency on the Wi-Fi infrastructure to aid locationing. The WiSeMote Location Management software offers the ability to compute the location of tags using the information reported by them. The enterprise product is delivered in two variations:

The Standard Access Point (SAP) locationing requires the tags to report a sufficient number of Access Point signal strength information in order to compute the tag's location using trilateration enhanced by information from a Site Survey carried out in advance. Typically, an enterprise Wi-Fi deployment would need to be enhanced to provide for the requirements for standard locationing over the entire area.

The Nearest Access Point (NAP) locationing operates of any available Wi-Fi deployment. In many applications, it is sufficient to locate an asset or personnel to, for example, a building, floor, and wing. Wi-Fi infrastructure need not be enhanced for this, nor is it required to carry out a detailed site survey. This is a lower cost alternative for specific applications.

In all cases, the locationing may be augmented by the use of other infrastructure devices such as the SuperMote and ChokePoint Exciter.