Patent ID: 9201140
Filing Date: 2015-12-01
Classification: G01S

Abstract:
1. A ranging method by using a first signal transmitted by a first device and a second signal generated and transmitted by a target device in response to the first signal, the method characterized in calculating a distance between the target device and a second device being in communication with the first device and the target device, by using: a first time interval measured from a time point of the first device's completing transmission of the first signal to a time point of the first device's completing reception of a first part of the second signal, and a third time interval measured from a time point of the first device's completing reception of the first part of the second signal to a time point of the first device's completing reception of a second part of the second signal; a second time interval measured from a time point of the second device's completing reception of the first signal to a time point of the second device's completing reception of the first part of the second signal, and a fourth time interval measured from a time point of the second device's completing reception of the first part of the second signal to a time point of the second device's completing reception of the second part of the second signal; a given delay time interval from a time point of the target device's completing reception of the first signal to a start time of the second signal and a given duration of each of the first and the second parts of the second signal; and a given distance between the first device and the second device.