The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2006
Filed:
Mar. 05, 2004
James E. Stevens, Mahtomedi, MN (US);
Frederick W. Eggers, Wilsonville, OR (US);
Feng Tang, Tualatin, OR (US);
Niall Creedon, Tigard, OR (US);
Douglas H. Marman, Ridgefield, WA (US);
James E. Stevens, Mahtomedi, MN (US);
Frederick W. Eggers, Wilsonville, OR (US);
Feng Tang, Tualatin, OR (US);
Niall Creedon, Tigard, OR (US);
Douglas H. Marman, Ridgefield, WA (US);
General Electric Company, Schenactady, NY (US);
Abstract
A security system senses intrusions into a shipping container through the opening of doors, cutting an opening, or removing the doors from their hinges. Intrusion information is transmitted to a remote receiver without interrogation, thereby reducing power consumption. Sensing is accomplished by employing a range-gated micro-impulse radar ('RGR') that generates microwave pulses that bounce around the interior of the container. The RGR includes a range gate that enables measuring reflected signals during the time gate period that is set for the time it takes a pulse to propagate a maximum distance within the container and reflect back. A direct current signal level is produced that represents the average reflected signal level within the container, and a Doppler shift measurement is made that represents motion inside the container. The signals are conveyed to the transmitter for conveyance to the remote receiver.