Google is developing an advanced hand gesture recognition sensor using radar technology called Project Soli. Soli is a miniature radar that recognizes human motions – from the tap of your finger to the movements of your body. Soli “interprets human intent” and your hand acts as the virtual tool.
Soli tracks sub-millimeter motions at high speed and accuracy but at low power. It detects movements, such as a button pushes, slider, and dial actions with your thumb and index finger. Its tiny chip is perfect for small devices, particularly wearables like watches. Soli is not a camera and it doesn’t capture visual images.
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Soli’s mini radar emits electromagnetic waves in a broad beam. When a hand is in the beam’s vicinity, it scatters this energy and reflects some of it back towards the radar antenna. Properties of the reflected signal absorb the information including the object’s characteristics and behaviors.