Patent ID: 8447329
Filing Date: 2013-05-21
Classification: G01S,G06F,G06K,H04W

Abstract:
1. A computer-generated method for determining position information, the method comprising: receiving a first time-stamped notification from a first mobile computing device, the first time-stamped notification indicating that a first chirp signal in an audio frequency range has been broadcast by the first mobile computing device; receiving a second time-stamped notification from a second mobile computing device, the second time-stamped notification indicating that the first chirp signal has been received by the second mobile computing device; determining distance between the first and second mobile computing devices based on time difference between the first and second time-stamped notifications, where the first chirp signal in the audio frequency range is transmitted with a distinctive pattern to allow detection of the first chirp signal from other signals present in the audio frequency range; transmitting first direction information to the first mobile computing device to direct a first user of the first mobile computing device toward a position of a second user of the second mobile computing device; receiving frames of a video stream from the first mobile computing device, the frames including an image of the second user; and performing facial recognition to recognize the second user.