Compliance with standards defined by the Bluetooth SIG ensures that the message format used by devices is compatible across vendors. Using a constellation of multi-antenna anchors, Bluetooth direction finding can be used to triangulate the precise location of a mobile device or tag within the covered indoor environment.īluetooth 5.1-based indoor positioning can achieve meter-level accuracies. ![]() Recognizing the growing demand for more accurate indoor positioning solutions, the Bluetooth SIG released Bluetooth 5.1 in January 2019, with Bluetooth direction finding as its main feature. ![]() These RSSI-based methods typically achieve accuracy levels of a few meters and have been used to determine whether an asset or a person is in a room. Alternatively, fixed anchors could measure the RSSI of the Bluetooth signal transmitted by a moving device, also referred to as a tag. The basic approach involved measuring the signal strength (RSSI) of the Bluetooth signal from fixed beacons using a Bluetooth receiver, for example, in a smartphone. ![]() Already prior to the release of Bluetooth 5.1, Bluetooth low energy technology had established itself as a leading solution for indoor positioning applications.
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