title: What‘s the principle of positioning exactly by bluetooth 5.1
body: <p>bluetooth 5.1 specifications announced a new direction finding feature that holds the potential to significantly enhance the performance of Bluetooth location services solutions. The new feature allows devices to determine the direction of a Bluetooth signal, thereby enabling the development of Bluetooth proximity solutions that can understand device direction as well as Bluetooth positioning systems that can achieve down to centimeter-level location accuracy.</p>
  
  <p>I want to know how to it implement this function</p>