Patent ID: 7603129
Filing Date: 2009-10-13
Classification: G01S

Abstract:
1. A method of determining the location of a wireless device, the method comprising: providing a wireless device and a plurality of anchor nodes, the anchor nodes having known locations and a synchronized sense of time; generating a message from the wireless device, wherein the message is generated using a carrier signal that is modulated according to a predetermined modulation communication protocol in conjunction with data for transmission, the message including a modulated signal having a modulated preamble, a modulated data portion, and a modulated postamble; during at least one of the modulated preamble, the modulated data portion, and the modulated postamble, providing at least one timing pulse in the modulated signal making up the message from the wireless device; receiving the message that includes the timing pulse at more than one of the plurality of anchor nodes; and comparing the times at which the more than one anchor nodes received the timing pulse in the modulated signal making up the message.