Night vision device with audio communication and identification facility

• US 5,648,862 A
• Filed: 07/27/1994
• Issued: 07/15/1997
• Est. Priority Date: 07/27/1994
• Status: Expired due to Term

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Litton Systems Incorporated
• Inventors: Owen, Larry D.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): BACARES, RAFAEL D
• Application Number:
  US08/281,442
• Time in Patent Office: 1,084 Days
• Field of Search: 359/152, 359/159, 359/169, 359/170, 359/172, 342/45
• US Class Current: 398/128
• CPC Class Codes: H04B 10/11 Arrangements specific to free-space transmission, i.e. transmission through air or vacuum

Abstract

A night vision device includes an image intensifier tube for providing an intensified image of a dim or night-time scene. The night vision device also includes provision for full duplex transmission and receipt of voice audio between the user of the device and another person who is using a substantially identical device. Another provision of the device is for interrogating IFF (identify friend or foe) units worn by other personnel. The IFF units have provision for receiving a beamed interrogation signal and for transmitting a coded identification signal in response. Thus, a user of the night vision device can identify friendly personnel at a distance, as well as communicating by voice with others who are using similar night vision devices so equipped.

Claims

1. A night vision device for receiving non-image information from a source in a night-time scene, said night vision device comprising:

an image intensifier having a field of view and receiving low-level light from said night-time scene, said image intensifier providing to a user of said night vision device a visible image replicating the night-time scene including said source while in said field of view;

receiver means for receiving a light beam carrying non-image information from said source while within said field of view, and for responsively providing an output response to said user.

2. The night vision device of claim 1 wherein said receiver means includes means for recovering audio non-image information from the light beam;

said means for recovering said audio non-image information from the light beam including a unit selected from the group including;

audio demodulators, audio digital decoders, and equivalents thereto; and

said night vision device includes an audio output transducer for providing the audio non-image information in audible form to a user of the night vision device.

3. The night vision device of claim 1 wherein said receiver means includes a detector for receiving the light beam and providing an electrical response including the non-image information.

4. The night vision device of claim 3 wherein said detector includes an image intensifier tube of said night vision device.

5. The night vision device of claim 1 wherein said receiver means includes a detector for receiving the light beam and providing an output response indicative of a predetermined encoded signal on said light beam.

6. The night vision device of claim 5 wherein said output response includes a identification friend-or-foe (IFF) signal provided to said user of said night vision device.

7. The night vision device of claim 6 wherein said IFF signal includes an auditory output from said night vision device to the user of the device.

10. The night vision device of claim 1 further including means for forwardly transmitting an invisible infrared beam from said night vision device, which invisible infrared beam is encoded or modulated with a speech audio signal from the user of the night vision device.

11. The night vision device of claim 10 wherein said means for forwardly transmitting an invisible infrared beam from said night vision device includes a microphone for receiving speech audio from the user of the night vision device and providing an electrical speech signal;

an amplifier receiving the electrical speech signal and providing an amplified electrical speech signal;

a unit selected from the group including;

audio modulators, digital audio encoders, and equivalents thereof;

said unit receiving said amplified speech signal and providing a modulated or encoded signal in response thereto, a light beam generator for providing an invisible infrared light beam, and a driver for said light beam generator receiving said modulated or encoded signal and driving said light beam generator to modulate or encode said signal on said invisible infrared light beam.

12. The night vision device of claim 10 wherein said means for forwardly transmitting an invisible infrared beam from said night vision device further includes input means for receiving an interrogation command from the user of said night vision device, a unit selected from the group including:

tone modulators, digital encoders, and equivalents thereof for providing said interrogation command and responsively providing a modulated or encoded interrogation signal, a light beam generator for providing an invisible infrared light beam, and a driver for said light beam generator receiving said modulated or encoded interrogation signal and driving said light beam generator to modulate or encode said interrogation signal on said invisible infrared light beam.

8. A night vision device comprising:

an image intensifier for receiving low-level light from a scene and providing a visible image replicating the scene;

receiver means for receiving a light beam carrying non-image information, and for providing an output response thereto;

wherein said receiver means includes a detector for receiving the light beam and providing an output response indicative of a predetermined encoded signal on said light beam, and said output response includes a identification friend-or-foe (IFF) signal provided to said user of said night vision device; and

wherein said IFF signal includes a visible light signal provided to the user of the device along with the replica image of the scene viewed through the device.

9. The night vision device of claim 8 wherein said night vision device includes an eyepiece into which the user peers to see the visible image replicating the scene, the night vision device including a light emitting diode visible through said eyepiece along with said scene, and means for illuminating said light emitting diode in response to said IFF signal.

13. A night vision device having a field of view and providing to a user of said device a visible-light image replicating a portion of said night-time scene within said field of view, said night vision device also having the capability to covertly identify personnel made visible in said night-time scene as friend or foe by selective emission of an interrogation signal, and in response to a non-image light-beam return identification signal from friendly personnel in said field of view providing a sensible output response to the user, said night vision device comprising:

an image intensifier for receiving low-level light from a night-time scene in said field of view and providing a visible image replicating the scene, said visible image rendering personnel in said field of view visible;

means for transmitting an invisible infrared beam from said night vision device into said field of view toward said visible personnel, input means for receiving an interrogation command from the user of said night vision device and transmitting said interrogation command on said invisible infrared beam;

receiver means for receiving a light-beam return identification signal carrying non-image identification information from friendly personnel in said field of view, and means responsive to said non-image identification information for providing an output response to said user.

14. The night vision device of claim 13 wherein said receiver means further includes means for recovering audio information from said light-beam return identification signal;

and said night vision device including an audio output transducer for providing the audio non-image information in audible form to said user of the night vision device.

15. The night vision device of claim 13 wherein said receiver means includes an image intensifier tube of said night vision device, said image intensifier tube providing said visible image to said user, and said image intensifier tube also providing an electrical response analogous to said non-image identification information.

16. The night vision device of claim 13 further including means for providing to said user a visible-light signal in response to said non-image identification information, which visible-light signal is provided to the user of said night vision device along with said visible image of the night-time scene.

17. The night vision device of claim 16 wherein said night vision device includes an eyepiece into which the user peers to see the visible image replicating the night-time scene, said means for providing said visible-light signal including a light-emitting diode visible through said eyepiece along with said visible image, and means for illuminating said light-emitting diode in response to said non-image identification information.