4 ms·

A very limited version of this feature is used in AirDrop with U1 equipped iPhones. Just point your phone to the phone you are transferring to and it shows up i

• ehsankia 6y ago
  Was that actually implemented / tested? I remember hearing about it but I never saw anyone mention or test it in any reviews. Does it actually work well?
  • varenc 6y ago
    It does exist, and it works! But both phones need U1 chips, meaning iPhone 11s and above. One thing that's cool about this is that iOS must be using the slight movements of the phone in your hand to help triangulate the other phone. Ultra-wideband position finding relies on time-of-flight, so from a single reference point you only know the precise distance something is from you, and not its direction. To get around, my guess is iOS is using the accelerometers in the phone to measure slight changes a phones position, and then using multiple ultra-wideband distance measurements from those different positions to triangulate the other phone.