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With direction finding for bluetooth applications, developers can bring products to market that understand device direction and achieve sub-meter location accuracy.

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Direction Finding Video - Indoor Asset Tracking

This training video explains how direction finding for Bluetooth applications brings a new dimension to indoor asset tracking.

简介

Silicon Labs’ Bluetooth solutions for Direction Finding applications brings a new dimension to indoor asset tracking and positioning. The Bluetooth 5.1 specification enhances location services with a direction finding feature that makes it possible to detect the direction of a Bluetooth signal.  

Applications for Direction Finding

  • 兴趣点
  • 物品追踪 
  • 实时定位 (RTLS)
  • 室内定位 

The two direction finding systems are Angle of Arrival (AoA) and Angle of Departure (AoD). With these technologies, the fundamental problem of locationing comes down to solving the arrival and departure angles of radio frequency signals. In AoD, the receiving device is able to calculate its own position in space using angles from multiple beacons and their positions (by triangulation). In AoA, the receiving device tracks arrival angles for individual objects. Still, it is good to note that different combinations of these can be performed; so, these techniques do not limit what can be done at the application level. Both in Bluetooth AoA and AoD, the related control data is sent over a traditional data channel. Typically, these techniques can achieve a couple of degrees angular accuracy and around 0.5 m locationing accuracy, but these figures are highly dependent on the implementation of the locationing system.

设计注意事项

到达角 

  • 资产只需要一根单天线,可实现低功耗,同时支持其他蓝牙 LE 功能 
  • 定位器需要 3 x 3 或 4 x 4 天线阵列和切换开关
  • Edge gateways process angle readings and communicate to an asset management system in the cloud to determine device location Angle of Departure

出发角

  • 信标需要 3 x 3 或 4 x 4 天线阵列和切换开关 
  • 智能手机等移动设备需要支持 AoD 算法 
  • 位置服务系统必须了解信标坐标

Bluetooth Angle of Arrival and Angle of Departure are new emerging technologies that can be used to track assets as and for indoor positioning and wayfinding. These are phase-based direction finding systems that require an antenna array, RF switches (or a multi-channel ADC), and processing power to run the estimation algorithms. Designing a proper antenna array, as well as an angle estimation algorithm are essential for a RTLS system. Strong performing estimator algorithms are often not computationally cheap. Other positioning technologies include (but are not limited to) RSSI based methods and ToA based methods, but only phase-based AoA/AoD currently have a standardized framework in Bluetooth.

 
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到达角设计注意事项 - Silicon Labs

AoA is a phase-based direction finding system used for asset tracking, indoor positioning and wayfinding. 

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资源

蓝牙应用程序:5.1 & 5.2 Series 

Bluetooth Direction Finding Fundamentals

Direction Finding with Bluetooth 5.1

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