NO983249L - Method and apparatus for detecting an object in an area to be monitored - Google Patents
Method and apparatus for detecting an object in an area to be monitoredInfo
- Publication number
- NO983249L NO983249L NO983249A NO983249A NO983249L NO 983249 L NO983249 L NO 983249L NO 983249 A NO983249 A NO 983249A NO 983249 A NO983249 A NO 983249A NO 983249 L NO983249 L NO 983249L
- Authority
- NO
- Norway
- Prior art keywords
- area
- threshold value
- monitored
- signal
- urefi
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Automation & Control Theory (AREA)
- Computer Security & Cryptography (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Det er kjent å detektere et objekt i et område som skal overvåkes ved å sende et høyfrekvent spørresignal fra en side av området og gjennom dette til en overforliggende andre side av området, hvor det mottas av en transponder, modifiseres og sendes tilbake gjennom området til den første side. Det modifiserte spørresignalet mottas på den første side av området og sammenlignes med en terskelverdi, idet et alarmsignal avgis dersom denne underskrides. En optimal innstilling av terskelverdien (Urefl) oppnås ved at det fra signalet (U) som sammenlignes med terskelverdien (Urefi), løpende dannes en middelverdi (M), ut fra hvilken det under hensyntagen til en forhåndsgitt sikkerhetsmargin, dannes en terskelverdi (Urefi).It is known to detect an object in an area to be monitored by transmitting a high frequency query signal from one side of the area and through it to an overlying other side of the area, where it is received by a transponder, modified and sent back through the area to it. first page. The modified query signal is received on the first page of the range and compared to a threshold value, with an alarm signal being output if this is lowered. An optimal setting of the threshold value (Urefl) is obtained by continuously generating a mean value (M) from the signal (U) compared with the threshold value (Urefi), from which a threshold value (Urefi) is formed, taking into account a predetermined safety margin. .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996106675 DE19606675A1 (en) | 1996-02-22 | 1996-02-22 | Method and device for detecting an object in an area to be monitored |
PCT/DE1997/000299 WO1997031275A1 (en) | 1996-02-22 | 1997-02-17 | Method and device for detecting an object in a region to be monitored |
Publications (2)
Publication Number | Publication Date |
---|---|
NO983249D0 NO983249D0 (en) | 1998-07-14 |
NO983249L true NO983249L (en) | 1998-08-21 |
Family
ID=7786152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO983249A NO983249L (en) | 1996-02-22 | 1998-07-14 | Method and apparatus for detecting an object in an area to be monitored |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0883818A1 (en) |
CA (1) | CA2246993A1 (en) |
DE (1) | DE19606675A1 (en) |
NO (1) | NO983249L (en) |
WO (1) | WO1997031275A1 (en) |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3995270A (en) * | 1975-06-16 | 1976-11-30 | The United States Of America As Represented By The Secretary Of The Navy | Constant false alarm rate (CFAR) circuitry for minimizing extraneous target sensitivity |
US4107678A (en) * | 1976-09-28 | 1978-08-15 | Westinghouse Electric Corp. | Polarization correlation target seeker |
DE2806448C2 (en) * | 1978-02-15 | 1985-01-10 | Brown, Boveri & Cie Ag, 6800 Mannheim | System for property security and personal protection by means of a microwave barrier |
GB2110825B (en) * | 1981-11-06 | 1986-04-30 | Outokumpu Oy | Apparatus for detecting metal objects |
DE3232437C2 (en) * | 1982-09-01 | 1985-03-21 | Brown, Boveri & Cie Ag, 6800 Mannheim | Method for increasing the security of an access control system |
US4725841A (en) * | 1983-06-30 | 1988-02-16 | X-Cyte, Inc. | System for interrogating a passive transponder carrying phase-encoded information |
US4899158A (en) * | 1987-09-26 | 1990-02-06 | Matsushita Electric Works, Ltd. | Moving object discriminating system |
EP0424371A1 (en) * | 1988-07-08 | 1991-05-02 | Zetetic International Limited | Method and apparatus for selectively detecting objects |
DE4036407C2 (en) * | 1990-11-15 | 1994-06-01 | Telefunken Microelectron | Sensor system |
US5508706A (en) * | 1991-09-30 | 1996-04-16 | Trw Inc. | Radar signal processor |
IT1265721B1 (en) * | 1992-11-11 | 1996-12-02 | Alessandro Manneschi | METAL DETECTOR WITH MULTIPOLAR WINDINGS WITH THE ELIMINATION OF NEUTRALIZING EFFECTS |
IT1260208B (en) * | 1992-11-19 | 1996-04-02 | Giovanni Manneschi | PERFECTED METAL DETECTOR |
DE4240921C1 (en) * | 1992-12-04 | 1994-05-11 | Alessandro Manneschi | Metal detector for locating hidden weapons - compares signals using reception windings at different heights, to correct non-linearity |
DE9305611U1 (en) * | 1993-04-08 | 1994-05-05 | Siemens AG, 80333 München | Arrangement for detecting an obstacle |
DE4336799A1 (en) * | 1993-10-28 | 1995-05-04 | Sel Alcatel Ag | Device for the detection of, and reading out from, transponders which move relative to this device |
DE9411602U1 (en) * | 1994-07-18 | 1995-08-17 | Siemens AG, 80333 München | Arrangement for the detection of objects in an area to be monitored |
-
1996
- 1996-02-22 DE DE1996106675 patent/DE19606675A1/en not_active Withdrawn
-
1997
- 1997-02-17 CA CA 2246993 patent/CA2246993A1/en not_active Abandoned
- 1997-02-17 WO PCT/DE1997/000299 patent/WO1997031275A1/en not_active Application Discontinuation
- 1997-02-17 EP EP97914156A patent/EP0883818A1/en not_active Withdrawn
-
1998
- 1998-07-14 NO NO983249A patent/NO983249L/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO1997031275A1 (en) | 1997-08-28 |
DE19606675A1 (en) | 1997-08-28 |
CA2246993A1 (en) | 1997-08-28 |
NO983249D0 (en) | 1998-07-14 |
EP0883818A1 (en) | 1998-12-16 |
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