Phase shift analysis for vehicle intrusion detection
US5396217A · kind A · utility
13Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Feb 1, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/1009
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Intrusion into an automotive vehicle interior is detected by passing an airborne acoustic signal through a portion of the vehicle interior when the vehicle security system is active, and by measuring any change in phase in the signal as it passes through the vehicle. The phase of a first frequency component in the signal is sensitive to intrusion into the vehicle, and the phase of a second frequency component is sensitive to false alarm conditions, but is not sensitive to intrusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.