High-accuracy indoor location services

Bluetooth® Direction Finding enables devices to determine the direction of a Bluetooth Low Energy (LE) signal, thereby enabling the development of Bluetooth proximity solutions that can understand device direction as well as Bluetooth positioning systems that can achieve centimeter-level location accuracy.


Bluetooth® Direction Finding: A Technical Overview

A detailed overview of Bluetooth direction finding and how it enables high-accuracy location services.


Image Source: NIST, Public domain, via Wikimedia Commons

Bringing established, time-tested methods for determining signal direction to a proven, trusted radio

Radio direction finding has been in practice since the early twentieth century and is used in systems to support everything from aviation and nautical navigation to wildlife tracking.

Bluetooth Direction Finding brings this well-established practice to one of the most trusted and widely deployed radio technologies in the world.

Bluetooth Direction Finding includes two different methods for determining signal direction, Angle of Arrival (AoA) and Angle of Departure (AoD).

Bluetooth® Angle of Arrival (AoA)

Enabling buildings to determine the location of people and things within

In the Angle of Arrival (AoA) method, a transmitting device, such as an asset tag in a Real Time Locating System (RTLS) solution, uses a single antenna to transmit a special signal.

The receiving device, such as a fixed locator, has multiple antenna arranged in an array. As the transmitted signal crosses the array, the receiving device collects data that enables it to calculate signal direction.

Bluetooth AoA Use Cases

Asset Tracking
Factories tracking material workflow and hospitals tracking the location of expensive mobile equipment

Worker Safety
Manufacturing facilities ensuring workers do not wander into unsafe areas

Player Performance
Sports teams tracking the real-time location and performance of athletes

Bluetooth® Angle of Departure (AoD)

Enabling people and things to determine their location within a building

The Angle of Departure (AoD) method is often described as ‘Indoor GPS’ as it operates in a similar way to outdoor global positioning systems.

In the AoD method, the transmitting device, such as a fixed locator in an Indoor Positioning System (IPS) solution, uses multiple antenna arranged in an array to transmit a special signal.

The receiving device, such as a smartphone, has a single antenna. As the signals from the transmitting device cross its antenna, the receiving device collects data that enables it to calculate signal direction.

Bluetooth AoD Use Cases

Indoor Navigation
From airports to museums to convention centers, Bluetooth AoD-based indoor positioning systems can enhance the visitor experience.

Autonomous Guided Vehicles (AGVs)
AGVs need to know where they are to get where they need to go. Bluetooth AoD-based indoor positioning systems let them know, precisely.


Enhancing Bluetooth Location Services with Direction Finding

Understand how direction finding enhances the performance of Bluetooth location services solutions


Direction Finding Resources

ABI Snapshot – Key findings from the 2024 Bluetooth Market Update

In this ABI Snapshot, ABI Research’s Senior Director Andrew Zignani and Bluetooth SIG’s Market…

Bluetooth® Channel Sounding: A Technical Overview

The forthcoming update to the Bluetooth® core specification adds a new feature called Channel…

Navigating Tomorrow: RTLS Trends and Projections for 2024

Looking back at the rise of location technology throughout 2023, it’s evident that the…

High-Accuracy Low-Power Secure Ranging using Bluetooth® Channel Sounding

Many applications use Bluetooth-based ranging and localization using received signal strength indication (RSSI), including…

Bluetooth® Low Energy Angle of Arrival Location Solution – Tags, Receiver, Antenna, Firmware, Application Software

The development of Bluetooth® Low Energy angle of arrival location solutions requires multi-disciplinary co-operation…

Distance Estimation Advantages Using Bluetooth® Channel Sounding

Bluetooth® Channel Sounding is an upcoming feature enables secure, fine ranging between two Bluetooth…

The Latest in HADM with Bluetooth LE

HADM, or high accuracy distance measurement using Bluetooth does exactly what it says –…

Reinventing Retail in the Connectivity Age

Despite the surge in e-commerce both before and during the pandemic, physical retail still…

New Trends in Bluetooth Location Services SolutionsBluetooth位置情報サービス ソリューションの新潮流

Though Bluetooth® technology is best known for it’s audio streaming and data transfer capabilities,…

Two New Technologies Shaking up the IoT

By example, Bluetooth has broadened its tracks through its direction-finding technologies, Angle-of-Arrival (AoA), and…

Bluetooth Direction Finding Fundamentals

Bluetooth Angle of Arrival (AoA) and Angle of Departure (AoD) are new technologies that…

Industry 4.0 Fasteners Manufacturing Industry

The manufacturing industry needs digital and innovative solutions to facilitate flexible and transparent production…

Getting Started With Bluetooth For High Precision Indoor Positioning

This white paper provides an introduction to Bluetooth high precision indoor positioning, explores what…

POM Tracer Ensures Workplace Safety with Contact Tracing Solutions from Laird Connectivity

POM Tracer was looking to create an easy-to-implement product that would allow businesses and…

Dyer Engineering Installs Location Tracking to Manage Workflows at Sites

Dyer Engineering is an innovative group of fabrication and machining businesses with wide-ranging capabilities…

 Get Help