Patent ID: 7289466
Filing Date: 2007-10-30
Classification: G01S

Abstract:
1. A method of determining the location of a wireless device, the method comprising: generating a first beacon from a first anchor node having a known location, the first beacon including a series of data packets, at least a first packet of the first beacon including an indication of the source and the direction of the first beacon at the time the first data packet is generated; generating a second beacon from a second anchor node having a known location, the second beacon including a series of data packets, at least a second packet of the second beacon including an indication of the source and the direction of the second beacon at the time the second data packet is generated; capturing the first data packet and the second data packet with the wireless device; and estimating the position of the wireless device with respect to the first and second anchor nodes; wherein the first and second beacons are spatially narrow beacons; and wherein the step of capturing the first data packet and the second data packet includes the following: