Abstract: A method, apparatus and RF unit for determining true angles of arrival of a beam received at an antenna array having a pair of antenna elements are provided. In some embodiments, a method includes computing a sum signal based on a sum of signals received from the pair of antenna elements of the antenna array and computing a difference signal based on a first difference of the signals received from the pair of antenna elements of the antenna array. The method also includes computing one of: a ratio of the sum signal to the difference signal; and a second difference between the sum signal and the difference signal. The method also includes determining all possible angles of arrival of the beam based on the one of the ratio and the second difference and then determining the intersection of all the possible angles of arrival for each of the different positions in order to determine the true angles of arrival.

Abstract: An assisted passive geo-location method and system for determining the location of a wireless device. The method includes passive location techniques in order to assist in determining the location of the wireless device and active techniques in order to assist in the calculation of the relative drift between the clock associated with the wireless device and the clock associated with the measuring station.

Abstract: A passive geo-location method for determining the location of a wireless device. The method includes receiving, by a measuring receiver at a first position, a first beacon transmitted to the measuring receiver by the wireless device, and receiving, by the measuring receiver at a second position, a second beacon transmitted to the measuring receiver by the wireless device. When the first position differs from the second position by less than a predetermined distance, the method further includes determining a relative drift between a clock associated with the wireless device and a clock associated with the measuring receiver, and determining a location of the wireless device based at least on the determined relative drift.

Abstract: A passive geo-location scheme of Wi-Fi access points is described using one or more mobile measuring stations. The methods and arrangements herein relate to, in one embodiment, using the TSF timer in beacons received by the measuring station, the reported TODs, the TOAs measured by the measuring station and synchronization between the timers of the wireless device and the measuring station. The synchronization includes applying a factor ? for correcting the timer associated with the measuring station when the measuring station receives the beacons, applying a factor ? for correcting a ratio of timer rates between the timer associated with the wireless device and the timer associated with the measuring station, and applying a factor ? for correcting changes in a timer rate ratio between the first timer associated with the wireless device and the timer associated with the measuring station.

Abstract: An assisted passive geo-location method and system for determining the location of a wireless device. The method includes passive location techniques in order to assist in determining the location of the wireless device and active techniques in order to assist in the calculation of the relative drift between the clock associated with the wireless device and the clock associated with the measuring station.

Abstract: A passive geo-location method for determining the location of a wireless device. The method includes receiving, by a measuring receiver at a first position, a first beacon transmitted to the measuring receiver by the wireless device, and receiving, by the measuring receiver at a second position, a second beacon transmitted to the measuring receiver by the wireless device. When the first position differs from the second position by less than a predetermined distance, the method further includes determining a relative drift between a clock associated with the wireless device and a clock associated with the measuring receiver, and determining a location of the wireless device based at least on the determined relative drift.