The system was created using commercial off-the-shelf components
The radar is connected to a small navigation computer that measures the distance between the heel and the ground at regular intervals. If it doesn't change, then the system knows that the user isn't actually moving and resets the IMU's inertial velocity reading to zero.
Researchers from North Carolina State University and Carnegie Mellon University have combined technology that is used to measure speed and distance with portable radar equipment to help keep track of a user's location
See the stories that matter in your inbox every morning