Patent ID: 7209469
Filing Date: 2007-04-24
Classification: G01S,H04B

Abstract:
1. A method of determining a propagation time in a signal path of a wireless network, comprising: sending a first ranging packet from a local device to a remote device at a first time; receiving a second ranging packet at the local device at a second time, where the second time is equal to the first time plus twice a propagation time between the local device and the remote device, plus a first hold time at the remote device; sending a third ranging packet from the local device to the remote device at a third time; receiving a fourth ranging packet at the local device at a fourth time, where the fourth time is equal to the third time plus twice the propagation time, plus a second hold time at the remote device, the second hold time being different from the first hold time; and calculating the propagation time at the local device as a function of the first time, the second time, the third time, the fourth time, and a proportion between the first hold time and the second hold time.