Google is lately developing a ew interaction sensor that can track movement with extremely high accuracy, named “Project Soli”. The goal of this attempt is to harness the power of hand and finger manipulation to make it easier to interact with ever-smaller devices and screens.
They are on their way to create something that let you control devices using natural hand motions, detecting motions even through materials.
How will they do such a thing?
The answer is: Radar technology!
The chip recognizes movement, velocity and distance and can be programmed to change the input based on that distance.
The Soli chip works within the 60Ghz radar spectrum at up to 10,000 frames per seconds. The final chip will contain everything it needs to be plug and play including the antennas.

A Doppler radar is a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the frequency of the returned signal has been altered by the object’s motion. (The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source).

The formula for radar doppler shift is the same as that for reflection of light by a moving mirror. Fd is the Doppler Frequency (Hz), v is the target velocuty (m/s), Ft is the original frequency (Hz) and c is the Speed of light.
The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves. It is commonly heard when a vehicle sounding a siren approaches, passes and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.

As always, you can try using fxSolver, with the Doppler radar-Frequency variation equation.
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