SYSTEM AND METHOD FOR FORMING OPTIMIZED PERIMETER SURVEILLANCE

• US 20090244070A1
• Filed: 03/27/2009
• Published: 10/01/2009
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Mattikalli, Raju S., Grube, Robert W., Thunemann, Paul Z.
• Granted Patent: US 8,686,854 B2
• Time in Patent Office: Days
• US Class Current: 345/441
• CPC Class Codes: G06T 17/05 Geographic models
• CPC Class Codes: G08B 13/183 by interruption of a radiation beam or barrier
• CPC Class Codes: G08B 13/196 using television cameras

Abstract

A software module apparatus for enabling a user to generate a virtual tripwire through a geographic area of interest using a plurality of sensors. The apparatus may make use of an input for allowing a user to input a digital elevation model (DEM) of the area of interest. An input responsive to a user controlled device may also be used for defining a swath of the area of interest, the swath representing a subregion laying over, or adjacent to, a border to be monitored. A display may be generated for illustrating computed locations of a plurality of independent sensors used to form the virtual tripwire through the swath of the area of interest.

Claims

1. A software module apparatus for enabling a user to generate a virtual tripwire through a geographic area of interest using a plurality of sensors, the apparatus comprising:

an input for allowing a user to input a digital elevation model (DEM) of the area of interest;

an input responsive to a user controlled device for defining a swath of the area of interest, the swath representing a subregion laying over, or adjacent to, a border to be monitored; and

a display generated for illustrating computed locations of a plurality of independent sensors used to form the virtual tripwire through the swath of the area of interest.

2. The apparatus of claim 1, further comprising a sensor number input field for enabling the user to input a number of sensors to be used by the apparatus in determining the locations of the sensors needed to form the virtual tripwire.

3. The apparatus of claim 1, further comprising inputs that enable the user to define a start location and an end location for the virtual tripwire.

4. The apparatus of claim 1, wherein the apparatus displays the sensors as an overlay on the DEM with the sensors at their computed locations.

5. The apparatus of claim 1, further comprising an input for enabling the user to increase and decrease a thickness of the virtual tripwire, the thickness representing a distance at any point along the virtual tripwire in which a person or object crossing the virtual tripwire will be detected.

6. The apparatus of claim 1, wherein the apparatus further displays a viewshed of each of said sensors on the generated display, the viewsheds representing a line-of-sight coverage region of each of the sensors used to form the virtual tripwire, and each said viewshed being overlayed over its respective said sensor.

7. The apparatus of claim 6, wherein the viewsheds are overlayed on the DEM.

8. The apparatus of claim 6, wherein each said viewshed comprises a plurality of wedges made up of at least one pixel, with each said wedge defining an area where a line-of-sight exists to its respective said sensor.

9. The apparatus of claim 8, further comprising an input for enabling a user to define a minimum distance of overlap between any two specific ones of the wedges before the two specific ones of the wedges can be defined as being adjacent, for purposes of using the their respective viewsheds to define virtual tripwire.

10. The apparatus of claim 8, further comprising an input for enabling a user to define a minimum number of pixels that are required to overlap between two said wedges of two different said viewsheds, before the two said wedges can be defined as being adjacent for the purpose of using their respective viewsheds to define the virtual tripwire.

11. The apparatus of claim 6, further comprising a user input for enabling the user to define a resolution of a display grid on which the DEM and the virtual trip wire are being displayed.

12. The apparatus of claim 1, further comprising a user input field for enabling a user to define a breach distance between two adjacent sensors forming the virtual tripwire, the breach distance representing a gap between a coverage region of said two adjacent sensors where the virtual tripwire is discontinuous.

13. The apparatus of claim 1, further comprising an input for enabling the user to define latitude and longitude coordinates of at least one element present within the area of interest, where the element comprises at least one of:

a bridge;

a road;

an antenna tower;

a power line pole;

a dam; and

a water tower.

14. The apparatus of claim 3, wherein the display is formed by a plurality of pixels, and wherein the apparatus includes a MinPath input to determine a minimum number of pixels that the virtual tripwire requires to extend from the start location to the end location.

15. A software module apparatus for enabling a user to generate a virtual tripwire through a geographic area of interest using a plurality of sensors to detect the presence of an object or individual that crosses the virtual tripwire, the software module comprising:

an input for allowing a user to input a digital elevation model (DEM) of the area of interest;

an input for enabling the user to define a plurality of candidate sensors that represents a maximum number of sensors that may be used to form the virtual tripwire;

a display generated for illustrating the virtual tripwire, the display displaying;

computed locations of at least a subplurality of the candidate sensors used to form the virtual tripwire through the area of interest;

a viewshed of each one of the subplurality of the candidate sensors used to form the virtual tripwire, each said viewshed representing a coverage region of its associated said candidate sensor and selected adjacent ones of the viewsheds of different ones of subplurality of the candidate sensors overlapping with one another; and

the display overlaying the viewsheds on the DEM while displaying the virtual tripwire.

16. The apparatus of claim 15, further comprising an input responsive to a user controlled device for enabling a user to define a swath of the area of interest, the swath representing a subregion of the area of interest in which the virtual tripwire is to be formed.

17. The apparatus of claim 15, wherein each said displayed viewshed includes a plurality of wedges forming independent subregions, with each said subregion having line-of-sight access to its associated said sensor;

and

the apparatus further including a user input enabling a user to define a minimum distance of overlap of two ones of the wedges of different ones of the candidate sensors before the two ones of the viewsheds are determined to be overlapping.

18. The apparatus of claim 15, further comprising an input enabling the user to define a desired minimum thickness of the virtual tripwire, the desired minimum thickness representing a distance generally perpendicular to the virtual tripwire within which one or more of the subplurality of candidate sensors is able to detect said object or individual.

19. A software module apparatus for enabling a user to generate a virtual tripwire through a geographic area of interest using a plurality of sensors to detect the presence of an object or individual that crosses the virtual tripwire, the software module comprising:

an input for allowing a user to input a digital elevation model (DEM) of the area of interest;

a computing subsystem for determining a minimum number of sensors, and a location of each one of said minimum number of sensors on the DEM, required to form the virtual tripwire; and

a display adapted to use information generated by the computing subsystem for illustrating the virtual tripwire as an overlay on the DEM.

20. The apparatus of claim 19, wherein the display is further adapted to display each one of said minimum number of sensors as an overlay on the DEM at its computed location.

21. The apparatus of claim 19, further comprising an input for enabling the user to define a thickness of the virtual tripwire, the thickness representing a distance generally perpendicular to the virtual tripwire at a given point therealong in which the object or individual is detected by at least one of the sensors as the individual or object crosses the virtual tripwire;

and

wherein the computing subsystem considers said thickness of the virtual tripwire in determining the minimum number of sensors and the location of each one of the minimum number of sensors.