Patent ID: 8929820
Filing Date: 2015-01-06
Classification: G01S,H04W

Abstract:
1. A distance determination method for two portable wireless short range radio-frequency devices, the method comprising: detecting at least one slave device within a communication range of a master device; transmitting signals that represent data packets, each data packet containing identification of the slave device and a strength of a corresponding signal when transmitted, wherein the signals are transmitted using variable strengths; based on a comparison between the strength of the corresponding signal when transmitted to a strength of the corresponding signal as-measured when received, determining a measured proximity between the master device and the at least one slave device; based on the measured proximity and historical signal strength data, determining a calculated proximity between the at least one slave device and the master device; determining an error range of the calculated proximity; and based on the determined error range, displaying on a display associated with the master device a representation of the calculated proximity, wherein the representation reflects a physical distance between the at least one slave device and the master device.