Pixie's Unique Approach to Thing-Finding

The Israeli firm integrated technology from Decawave, a provider of UWB systems generally used for industrial applications, into its consumer-facing tracking tool.
By Mary Catherine O'Connor
Aug 25, 2016

As a quick Google search for the phrase "find my keys" reveals, there is no shortage of products on the market these days designed to help consumers find their everyday but often-lost articles, such as keys, wallets, smartphones or tablets. Most of these products, such as Tile or TrackR, are based on the use of small, battery-powered tags, which users can attach to items they want to track, and which communicate with mobile apps via a Bluetooth connection. When placed into search mode, the application, running on a user's smartphone, analyzes the strength of the Bluetooth radio link in order to determine that phone's distance from the tag attached to the missing item.

But Pixie, a startup with offices in Tel Aviv and California, entered the thing-finding market last year with a different approach, borrowed from real-time location systems widely used for commercial or industrial applications. Rather than only relying on the Bluetooth signal between a single tag and a mobile device to determine the tag's location, Pixie's tags, dubbed Pixie Points, form a mesh network by communicating with each other via a technology called ultra-wideband (UWB) location tracking. A Pixie Point is slightly larger than a guitar pick.

A Pixie Point tag
Each Pixie Point contains a DWM1000 UWB module, made by Irish company DecaWave, which measures the distance between tags. To do this, the radio inside each module transmits a signal (compliant with the IEEE802.15.4-2011 standard) and the module calculates the time of flight (TOF) of each tag's signal, using a process called multiple two-way ranging, enabling each tag's location to be pinpointed in three dimensions in relation to an anchor tag.

A user attaches one Pixie Point to his smartphone, on which he runs the Pixie app. That Pixie Point acts as the anchor tag. When he opens the Pixie app in order to locate a specific tag, its location is determined in relation to the anchor tag, and this data is transmitted to the app via Bluetooth.

A single Pixie Point could be tracked by using multiple two-way ranging between it and the anchor tag, but the more Pixie Points deployed inside a home, the more data the UWB system can leverage to triangulate each tag's location, and thus the more accurate the directions are—up to 30 centimeters (11.8 inches) of accuracy.

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