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Indoor positioning using Angle of Arrival

15.07.2021
3 min.
Navigine - Indoor positioning using Angle of Arrival

Source - Josh Warren

Many real time location systems (RTLS) require high accuracy of results, up to several centimeters. In such situations AoA based positioning, whose realization is possible thanks to the Bluetooth 5.1 technology, comes for help. The Angle of Arrival method provides for the use of not only the signal strength (RSSI) but also the angle of its arrival, which allows calculating the exact location of the object within the range of 0.1 - 1 m. AoA angle of arrival belongs to triangulation-based methods.

Difference in methods based on RSSI and AoA

Both RSSI and AoA technologies make it possible to define the location based on Bluetooth but they differ. While AoA uses the angle of arrival, RSSI functions by measuring the power of the signal that is sent by the transponders placed on the tracked assets. Its performance can be compared with the waves emerging from a stone thrown into water. At first, they are big but tend to decrease with distance.

Application of local positioning based on Angle of Arrival

Angle of Arrival positioning increases the performance efficiency of many modern enterprises. The given technology is the most common in healthcare, logistics and industry.

Logistics and warehousing

The implementation of AoA makes it possible to improve warehouse monitoring and ensure better control over the movement of assets and the staff. Using Angle of Arrival systems, companies can track goods more precisely, follow the movement of the equipment and react timely to emergency situations. Moreover, it increases the efficiency of logistics processes and helps the management to optimize warehouse operations.

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Industry

Industrial enterprises can use the AoA method for constant control over assets, transport, equipment and persons. It can also be used for building virtual borders around potentially dangerous zones, which leads to reducing risks of unauthorized access.

Thanks to high accuracy of geolocation (up to 10 cm), the technology significantly simplifies the dispatch of stock reposition and the support of staff management services. Experience has shown that after using the Angle of Arrival method, the labour productivity increases on average by 30% and the overall cost of indoor navigation infrastructure ownership decreases by 50%.

Healthcare

The usage of Bluetooth Angle of Arrival in medical institutions can simplify the navigation in hospitals and increase customer satisfaction. Indoor navigation based on Angle of Arrival calculation guarantees many advantages:

  • makes it easier for visitors to search the necessary room;
  • helps to create personalized location-based notifications;
  • allows monitoring the movement of equipment, medicines (vaccines), employees;
  • helps tracking the workload of the hospital staff;
  • increases operational efficiency due to improved asset management.

While developing local indoor positioning systems, Navigine makes use of numerous cutting edge technologies, including Bluetooth Angle of Arrival estimation method. The technology implementation allows enhancing the navigation platform and increasing the location accuracy up to 1 cm.

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