Patent ID: 8330648
Filing Date: 2012-12-11
Classification: G01S

Abstract:
1. A method for measuring a distance in a wireless environment, comprising: transmitting a distance measurement signal to a second device and receiving at least one response signal for the transmitted distance measurement signal from the second device by a first device; matching a received response signal waveform with a reference signal waveform to detect a peak value of an earliest response signal waveform by the first device; detecting the peak value of the earliest response signal waveform using a result of the matching by the first device; and calculating a time taken from the transmission of the distance measurement signal to the second device and the reception of the response signal from the second device using a peak value of the earliest response signal by the first device, wherein a pulse width of the reference signal is computed by: where α denotes a value proportional to Received Signal Strength Indication (RSSI), and single pulse width is defined as a pulse width measured at a reference RSSI, and wherein the peak value of the reference signal is detected according to the pulse width of the reference signal.