There are three main methods for localising an object using 2.4 GHz radio in use today. All involve fixed nodes (‘anchors’) and the nodes to be tracked (‘tags’).

The simplest is by measuring the signal strength of a transmission from the anchors to the tag or vice versa. The signal being measured could be a reflection, attenuated by obstacles or the direct signal, which makes this approach the least accurate. Positioning within 3-5m is typical for indoor deployments with a couple of anchors per room.

More precise positioning can be done by measuring the Angle of Arrival pioneered by Quuppa and now included in the Bluetooth specification as of version 5.1. With AoA we can get measurements that are extremely precise, at the expense of more complicated hardware and commissioning.

Finally, though not strictly a 2.4 GHz technology but deployed to great success by RedLore, a supplemental Ultra Wide Band radio measures the Time of Flight of messages for similarly precise measurements as with AoA.

All of these approaches have applications to which they are best suited. Book a free consultation with us to learn more!

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