BERMUD
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Architecture

How is a position computed?

The tag transmits, the site anchors listen and compute. All the work happens in the infrastructure, which leaves a tag that stays simple and cheap.

01The tag

A minimal device.

A screen, a few sensors, a battery and four buttons.

Close-up of the tag held in one hand. The screen shows a name, a zone, a direction arrow and a distance, above the four buttons.
Concept visual. The four controls: two arrows, FIND and SOS.

Composition

RadioDW3000 ultra-wideband transceiver
ProcessornRF52 microcontroller, Bluetooth Low Energy built in
DisplayMonochrome OLED screen
SensorsAccelerometer
ControlsTwo arrows, a FIND button, an SOS button
PowerLithium polymer battery, 250 to 400 mAh
Target formThick key-fob style enclosure rather than a flat badge
02The anchors

Everything sits in the infrastructure.

The tag computes nothing. The anchors carry the whole system: they locate, they route requests between tags, and they feed the control room dashboard.

  • They compute the position of every tag on site, and keep it current.
  • They route searches from one tag to another, and send back the direction to display.
  • They track the movement of medical and security teams, and report their positions to the control room.
  • They synchronise with each other over radio. There is no cabling to run between the points, only a power feed per anchor.
  • They are fixed at height on the existing site infrastructure, at accurately surveyed positions.
A compact matt grey anchor with a small antenna dome, fixed at height on a stage structure.
Concept visual. An anchor mounted on an existing structure.
Positioning principle using a network of anchorsA tag in the middle of a site transmits a radio pulse. Four anchors placed around it, at known positions, receive it and work out the tag position together.B1B2B3B4TAG
The network at work. Four anchors at known positions, one tag transmitting. The anchors work out its position together.
03Range and accuracy

Two-metre detection, across the whole festival.

Target accuracyAround 2 m, in a properly covered zone
Estimated range50 to 100 m from an elevated anchor, in line of sight
Transmit powerUp to −41.3 dBm/MHz EIRP, the European limit. In the order of one thousandth of the power of a mobile phone while transmitting.
StandardsIEEE 802.15.4z for the radio layer, ETSI EN 302 065 for European conformity
04Next

Prototype under development

We are currently building a first working prototype. If you would like to know more, get in touch with us.

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