Reconnaissance system

• US 4,796,090 A
• Filed: 09/29/1986
• Issued: 01/03/1989
• Est. Priority Date: 09/06/1984
• Status: Expired due to Fees

• Current Assignee: Israel Fraier
• Original Assignee: Israel Fraier
• Inventors: Fraier, Israel
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US06/912,524
• Time in Patent Office: 827 Days
• Field of Search: 358/211, 358/209, 358/93, 358/109, 358/222, 358/95, 358/108
• US Class Current: 348/147
• CPC Class Codes: H04N 23/81 for suppressing or minimising disturbance in the image signal generation

Abstract

The invention relates to improvements in airborne, marine, and/or moving vehicle-carried, stabilized high resolution long-range surveillance systems, which are based on a stabilized platform, TV cameras and a lens with a relatively long focal length. The improvement overcomes almost absolutely the problems due to residual remaining vibrations that are inherent in the stabilized platform. The system comprises mechanical stabilizing structure adapted to reduce vibrations and especially to eliminate or at least drastically reduce high frequency vibrations, a TV sensor, optionally including or coupled in intensifying electro-optical imaging structure, an optical lens and exposure control structure so as to record the image on the sensor for a period of time which is much shorter than the usual television frame time.

Claims

1. A real time reconnaisance (surveillance) system adapted to be mounted on a moving aerial, ground or marine platform which provides very high resolution and high quality imaging, said system comprising in combination:

means for substantially eliminating or drastically reducing high frequency vibrations at frequencies higher than about the 30 to 40 Hz range, to a level of less than about 10 μ

rad peak to peak;

TV electrooptical or staring arrays sensor means;

an optical lens of a focus of at least 300 mm;

exposure control means adapted to record or expose the target image on the said sensor for a period of time substantially shorter than the conventional frame time of the said sensors.

2. A system according to claim 1, where the stablization means substantially reduces vibrations in the highter than about 30-40 Hz range to a level of less than 10 μ

rad peak-to-peak.

3. A system according to claim 1, where the sensor exposure time is at least 1/250 second and up to about 1/10,000 second.

4. A system according to claim 1 where the focal length of the lens is from 300 to 3,000 mm.

5. A system according to claim 1, where the sensor is an ordinary tube TV camera.

6. A system according to claim 1, where the sensor is an LLTV tubes camers.

7. A system according to claim 1, where the sensor is a solid state sensor optionally coupled to intensifying means.

8. A system according to claim 6 or 7 provided with electro-optical image intensifying means.

9. A real time reconnaisance (surveillance) method providing very high resolution and high quality target imaging, unattainable by conventional TV surveillance systems, by means of a moving platform reconnaissance system which comprises:

stabilizing the system so as to drastically reduce vibrations of frequency of higher than about 30-40 Hz to a level of about 10 μ

rad peak to peak jittering amplitude;

directing a long focal length optical lens coupled to a TV imaging system at the target;

recording the image on the sensor for an exposure time shorter than the conventional frame times of TV cameras, and generally of the order of 1/250 second or less, and evaluating the image.

10. A method according to claim 9, where the exposure time is of the order of 1/250 to about 1/10,000 second.

11. A method according to claim 9, where the optical lens has a focal length of 300 mm or more.