| US 7,495,613 B2 | ||
| System and method for position determination by impulse radio | ||
| Larry W. Fullerton, Brownsboro, Ala. (US); James L. Richards, Fayetteville, Tenn. (US); and Ivan A. Cowie, Madison, Ala. (US) | ||
| Assigned to Time Domain Corporation, Huntsville, Ala. (US) | ||
| Filed on Oct. 31, 2007, as Appl. No. 11/979,191. | ||
| Application 09/517161 is a division of application No. 09/045929, filed on Mar. 23, 1998, granted, now 6,133,876. | ||
| Application 11/979191 is a continuation of application No. 10/901404, filed on Jul. 29, 2004, granted, now 7,372,403. | ||
| Application 10/901404 is a continuation of application No. 10/441078, filed on May 20, 2003, granted, now 6,774,846. | ||
| Application 10/441078 is a continuation of application No. 09/954204, filed on Sep. 18, 2001, granted, now 6,611,234. | ||
| Application 09/954204 is a continuation of application No. 09/517161, filed on Apr. 05, 2000, granted, now 6,297,773. | ||
| Prior Publication US 2008/0100497 A1, May 01, 2008 | ||
| Int. Cl. G01S 3/02 (2006.01) | ||
| U.S. Cl. 342—450 | 16 Claims |
| 1. A method for synchronization of a plurality of ultra wideband radios, said method comprising the steps of:
a. obtaining at each of said plurality of ultra wideband radios a synchronization signal corresponding to an external clock;
b. synchronizing internal clocks of each of said plurality of ultra wideband radios with said synchronization signal;
c. receiving at each of said plurality of ultra wideband radios an ultra wideband signal transmitted by another ultra wideband
radio; and
d. determining a position of said another ultra wideband radio based upon the times of arrival of said ultra wideband signal
received at said plurality of ultra wideband radios.
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