Silicon Labs Demonstrates Bluetooth 5.1 Location Technology (Video)

Recently there are been advancements related to precise indoor positioning with the announcement for Bluetooth 5.1 and 802.15.4z. Both can provide 1 to 10 centimeters accuracy with minimal lag, and Bluetooth 5.1 achieves this through Angle of Arrival (AoA) and Angle of Departure (AoD) features and an antenna array.

I had never seen the new feature in action, but Silicon Labs recently demonstrated Bluetooth 5.1 location technology at Arrow IoT summit with a DMX-512 connected light following a person carrying a Bluetooth 5.1 tag.

It looks fairly accurate, and it does not have a 3-6 seconds lag like previous solutions based on earlier versions of Bluetooth?

So what does one need to enable Bluetooth 5.1 location finding?

Bluetooth 5.1 Location Base Station
Click to Enlarge

First, we’ll need a Bluetooth 5.1 base station with an antenna array, The one used above includes a 16 antenna array (4×4 grid) used to calculated angles of departure and arrival and ultimately the position and direction of the beacons. The Silabs Blue Gecko MCU powered base station can be connected to a computer over USB or Ethernet for visualization, or in this instance to control the light.

Bluetooth 5.1 Beacon

You’ll also need a coin-cell powered Bluetooth 5.1 beacon that sends the signals allowing tracking. Apparently, this can also work in reverse, where several beacons are stationary, and the base station(s) is/are moving around for example for heavy machinery tracking.

Tracking has its uses, but if you are uneasy with Bluetooth LE tracking, BLE and MAC randomization are techniques used to make devices harder to track. This is apparently enabled by default on iOS and MacOS, except for Apple TV.

If you’d like to know more about Bluetooth 5.1 location & direction finding, read more on Silicon Labs website.

Support CNX Software - Donate via PayPal or become a Patron on Patreon
Notify of
newest most voted
1 year ago

So this is not something we can expect to see a key finding app for anytime soon then…

Jon Smirl
1 year ago

The main market for this is tracking the flow of people in stores and events. But… over time this may become feasible for home use by using the antenna arrays already built into 802.11n routers. Or someone might come up with a clever way of etching the array into a small PCB. That looks like a PCB antenna in the photo but it is a foot square. The electronics are not so complex since the smarts are built into the SiLab Bluetooth chips, those chips have GPIOs which are used to switch between the antennas. You then need to add… Read more »

David Jashi
1 year ago

Why even bother to make antennas small? There are plenty of wall-hanging consumer devices, that are supposed to be big enough to accommodate antenna of this size. Wall clock or picture frames being the first examples to come to mind.

9 months ago

”Why even make computers small. Nobody will ever need a computer smaller than the size of a science laboratory!!”

1 year ago

Isn’t BT5.1 a coherent system? If yes then why aren’t they employing ToF to enhance accuracy, resolution and/or range through range multilateration in addition to the existing triangulation via AoA/D? It should not require additional hardware.

richard blanchette
richard blanchette
18 days ago

How does one go about purchasing a devkit as shown? ie. base station + antenna + beacon