Bluetooth Low Energy (BLE) Indoor Positioning Systems
The BLE technology is renowned and utilized for most proximity solutions, due to its simplicity for implementation, and low cost. The energy efficient wireless technology allows BLE beacons to operate on a tiny battery for potentially years, which makes the technology ideal for Indoor Positioning Systems.
BLE 5.1 Angle of Arrival (AoA)
BLE traditionally rely on Received Signal Strength Indicator (RSSI) and Trilateration to calculate the position of the subject. Most Indoor Positioning System vendors in the market are providing BLE solution.
BLE 5.1 AoA utilizes Triangulation in addition to the former concepts mentioned for BLE. The AoA positioning algorithm reads incoming waves from unique direction, and calculate the position of the subject based on the angle from where the subject is transmitting the signal. This improves the accuracy of the position-reading up to ten folds, achieving an average accuracy of less than 1 meter.
Refer to the illustration to understand the concept of Triangulation for Indoor Positioning.
BLE Technology Comparison
|Indoor Positioning Systems||Bluetooth Low Energy RSSI||Bluetooth Low Energy Angle of Arrival|
|Average Accuracy||5 ~ 10 m||0.1 ~ 0.5 m|
|Gateway IoT capabilities||No||Yes|
|Protocol||Gateway BT 4.0+, Tag BT 4.0+||Gateway BT 5.1, Tag BT 4.0+|
|Sales Model||SaaS Product, Enterprise Solution||Enterprise Solution|
AoA technology provides a pinpoint level of tracking down to <1m and BLE technology provides a proximity level of tracking between the range of 5 – 10m. Match the right solution to your need with the information above, a one-size-fits-all Indoor Positioning System does not exist.
No Indoor Positioning Solution can be designed to conform with all requirements as there are too many complications – i.e., can you afford to estimate your subject’s indoor position? What’s your budget?
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