Miniature celestial direction detection system

• US 8,471,906 B2
• Filed: 08/25/2009
• Issued: 06/25/2013
• Est. Priority Date: 11/24/2006
• Status: Active Grant

• Current Assignee: Trex Enterprises Corporation
• Original Assignee: Trex Enterprises Corporation
• Inventors: Belenkii, Mikhail, Bruns, Donald, Brinkley, Timothy
• Primary Examiner(s): NGUYEN, PHUOC H
• Application Number:
  US12/583,776
• Publication Number:
  US 20100283840A1
• Time in Patent Office: 1,400 Days
• Field of Search: 348/144, 348/208
• US Class Current: 348/144
• CPC Class Codes: G01C 21/02 by astronomical means G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G01S 19/14 specially adapted for specific applications
• CPC Class Codes: G01S 3/7867 Star trackers navigation using star trackers G01C21/025
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A celestial direction finding system. The system includes an inclinometer, at least one camera for imaging both the daytime sky and the nighttime sky and a computer programmed with a sun, moon and star catalog and algorithms for automatically determining directions based on positions of celestial bodies imaged by at least one camera and incline positions measured by the inclinometer. In a preferred embodiment all of the above features are combined in a single battery operated miniature celestial direction finding module. Geographical positions of nearby objects can be determined with the addition of a rangefinder and knowledge of the geographical position of the camera. The geographical position of the system in preferred embodiments can be determined with the addition of a GPS unit.

Claims

1. A target location system comprised of:

A) a telescopic range finder comprising a telescopic instrument bore-sighted with a range finder,

B) a miniature celestial direction detection system comprising;

C) at least one camera for viewing a large portion of sky, said camera comprising;

1) a wide angle lens and

2) a sensor having a focal plane array of at least about 350,000 pixels; and

D) a MEMS inclinometer and

E) a microprocessor programmed with;

1) an astronomical algorithm for defining locations of celestial objects based on known time,

2) coordinate transformation software for converting pixel image software into astronomical coordinates,

3) software to synchronize the processor with an Internet time source accurate to within 3 seconds and to provide system GPS location of the system accurate to within 5 meters or less corresponding to precision needed for identification of a target location;

4) software adapted to compute location of the target based on the system location and direction and range information provided by components of the system.

2. The celestial direction detection system as in claim 1 wherein the wide angle lens is a fisheye lens.

3. The celestial direction detection system as in claim 1 wherein said location is provided in terms of latitude and longitude.

4. The celestial direction detection system as in claim 3 wherein the time signal is a time signal transmitted by NIST.

5. The celestial direction detection system as in claim 1 wherein said location is provided in terms of latitude, longitude and elevation.

6. The celestial direction detection system as in claim 1 wherein identification is in terms of latitude, longitude and elevation of the target.

7. The celestial direction detection system as in claim 1 wherein said at least one camera is a single camera.

8. The celestial direction detection system as in claim 7 wherein said single camera defines an optical path and comprises a filter and a means for removing the filter from the optical path.

9. The celestial direction detection system as in claim 7 wherein said single camera comprises a checkerboard filter adapted to permit said camera to images the sun in daytime and stars at nighttime.

10. The celestial direction detection system as in claim 7 wherein said camera is adapted to provide a dynamic range of 10¹¹.

11. The celestial direction detection system as in claim 1 wherein said system is installed on a robotic vehicle.

12. The celestial direction detection system as in claim 11 wherein said robotic vehicle is adapted for surveillance.

13. The celestial direction detection system as in claim 11 wherein said robotic vehicle comprises at least one weapon.

14. The celestial direction detection system as in claim 1 wherein said telescopic instrument is a telescope.

15. The celestial direction detection system as in claim 1 wherein said telescopic instrument is binoculars.

16. The celestial direction detection system as in claim 15 wherein said binoculars are gyro stabilized.

17. The celestial direction detection system as in claim 1 wherein said system is mounted directly or indirectly on a tripod.