Distributed aperture imaging and tracking system

• US 5,317,394 A
• Filed: 04/30/1992
• Issued: 05/31/1994
• Est. Priority Date: 04/30/1992
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Hazlett, Joel F., Nathanson, Harvey C., Hale, Robert A.
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): LIN, BRYAN T
• Application Number:
  US07/876,619
• Time in Patent Office: 761 Days
• Field of Search: 358/87, 358/222, 358/109, 358/103, 358/108
• US Class Current: 348/207.99
• CPC Class Codes: H04N 7/181 for receiving images from a plurality of remote sources

Abstract

An imaging system utilizes a plurality of sensors capable of sensing objects within a field of view about a sight line. At least two sensors have different sight lines with the sight lines having known relative positions. Each sensor produces signals corresponding to positions of objects within a field of view over time. At least one sensor signal memory receives those signals and stores them in a manner enabling concurrent access to signals received from any selected combination of sensors. The processing unit and associated memory contain at least one program for selecting sensor signals from a sensor signal memory. Preferably motion detectors are provided for determining vibration, flexure or movement of each sensor. A normalizing means is preferably provided to adjust the sensor or make an appropriate modification of the signal received from the sensor.

Claims

1. An imaging system comprising:

a plurality of sensors capable of sensing objects within a field of view about a sight line, at least two sensors positioned to have different sight lines and the sight lines having known relative positions, each sensor producing signals corresponding to positions of objects within a field of view at a given time at least one sensor being subjected to at least one of motion, flexure and vibration;

means for sensing and measuring at least one of motion, flexure and vibration of each at least one sensor;

an internal navigational system which establishes a reference plane which reference plane remains in a selected position;

adjustment means attached to at least one sensor and to the internal navigation system so that the adjustment means will adjust the sight lines of the sensors in response to movement of the sensors caused by at least one of motion, flexure and vibration and to maintain a desired spatial relationship between the reference plane and the sight lines of the sensors;

at least one sensor signal memory connected to the sensors which receives and stores the signals produced by the sensors in a manner permitting concurrent access to and display of signals received from any selected combinations of at least two sensors; and

a processing unit and associated memory containing at least one program for selecting sensor signals from the sensor signal memory in a manner to create a composite image from signals from at least two sensors and doing at lease one of outputting selected sensor signals, processing selected sensor signals to create at least one processed signal and outputting selected processed signals, the processing unit being connected to at least one sensor signal memory.

2. The imaging system of claim 1 where the means for sensing and measuring comprises one of a gyroscope and an accelerometer.

3. The imaging system of claim 1 also comprising a lens having a line of sight and attached to a selected sensor and the adjustment means and wherein the adjustment means comprises a motor for moving the lens line of sight.

4. The imaging system of claim 1 wherein at least two the sensors are clustered so that their sight lines intersect.

5. The imaging system of claim 4 wherein a plurality of sensors are positioned around a window so that the lines of sight of all sensors so positioned pass through the window.

6. The imaging system of claim 1 wherein the sensors are capable of sensing at least one of visible light, infrared light and radar signals.

7. The imaging system of claim 1 also comprising normalizing means connected to the sensors for normalizing signals received from the sensors.

8. The imaging system of claim 7 wherein the normalizing means comprises a processing unit and associated memory containing a program for modifying the signals in a desired manner.

9. The imaging means of claim 7 wherein the normalizing means adjusts the signals to normalize for one of signal gain and variation in intensity among sensors and sensor elements.

10. The imaging system of claim 1 also comprising a display connected to the processing unit.

11. The imaging system of claim 10 wherein the display is one of a cathode ray tube and an LED for displaying video images corresponding to selected signals.

12. The imaging system of claim 10 also comprising a selector connected to the processing unit, the selector enabling a user to select desired signals from the sensor signal memory to cause images corresponding to the selected signals to appear on the display.

13. The imaging system of claim 12 wherein the selector is a motion sensor attached to headgear and connected to the processing unit so that signals and corresponding video images will be selected in response to movement of the headgear.

14. The imaging system of claim 1 also comprising a plurality of of displays and a plurality of selectors to enable more than one operator to separately access an image when an image selected by one operator is different from an image selected by another operator.

15. The imaging system of claim 14 wherein more than one operator can access images simultaneously.