	US 7,592,944 B2
	System and method for intrusion detection using a time domain radar array
Larry W. Fullerton, New Hope, Ala. (US); James L. Richards, Huntsville, Ala. (US); Mark D. Roberts, Huntsville, Ala. (US); and Brandon S. Dewberry, Huntsville, Ala. (US)
Assigned to Time Domain Corporation, Huntsville, Ala. (US)
Filed on Oct. 31, 2007, as Appl. No. 11/980,739.
Application 11/980739 is a continuation in part of application No. 10/806131, filed on Mar. 23, 2004, granted, now 7,358,888.
Application 10/806131 is a continuation of application No. 10/449602, filed on Jun. 02, 2003, granted, now 6,710,736.
Application 10/449602 is a continuation of application No. 10/131598, filed on Apr. 25, 2002, granted, now 6,573,857.
Application 10/131598 is a continuation of application No. 09/767131, filed on Jan. 23, 2001, granted, now 6,400,307.
Application 09/767131 is a continuation of application No. 09/332502, filed on Jun. 14, 1999, granted, now 6,177,903.
Prior Publication US 2008/0165046 A1, Jul. 10, 2008
Int. Cl. G01S 13/42 (2006.01)

U.S. Cl. 342—57 [342/21; 342/22; 342/27; 342/28; 342/58; 342/59; 342/107; 342/113; 342/114; 342/125; 342/126; 342/146; 342/147]

20 Claims

1. A sensor array comprising:

a plurality of ultra wideband (UWB) sensors, said plurality of UWB sensors arranged in a sparse array, a first UWB sensor of said plurality of UWB sensors being configured to transmit first UWB signals, a second UWB sensor of said plurality of UWB sensors being configured to receive first signal returns of said transmitted first UWB signals reflecting off an object, said first signal returns corresponding to first forward scattering data; and

a processor in communication with at least one of said plurality of UWB sensors, wherein said processor determines at least one characteristic of said object based on said first forward scattering data and uses said at least one characteristic and at least one established criteria to determine an alert condition.