Secure and programmable friendly target recognition system

• US 5,202,783 A
• Filed: 06/24/1991
• Issued: 04/13/1993
• Est. Priority Date: 06/24/1991
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Seavey, Henry C., Holland, O. Thomas
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US07/719,457
• Time in Patent Office: 659 Days
• Field of Search: 359/154, 359/155, 359/159, 359/152, 359/143, 359/142, 359/168, 359/170, 342/45, 342/50, 342/53, 342/67, 250/203-206, 340/825.34, 340/825.49, 340/825.54
• US Class Current: 398/108
• CPC Class Codes: G01S 17/74 Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe

Abstract

A friendly target recognition system is provided for use in combat zones ing friendly and unfriendly target objects residing therein. Transmitting means are mounted on each friendly target object in the combat zone to transmit radiation in the form of coded, short burst data packets according to a particular digital transmission code sequence. A receiving means is mounted on the targeting device that is aimed at one targeted object. The receiving means has a field-of-view that is limited to the one targeted object such that the presence of the transmitted radiation according to the particular digital transmission code sequence is indicative of a friendly target object.

Claims

1. In a combat zone having friendly and unfriendly target objects residing therein, a system for recognizing friendly target objects during the targeting thereof, said system comprising:

transmitting means mounted on each friendly target object in the combat zone for transmitting radiation simultaneously in all directions therefrom in the form of coded, short burst data packets according to a particular digital transmission code sequence; and

receiving means having a field-of-view limited to one targeted object to be recognized, said receiving means being mounted on a targeting device aimed at the one targeted object for detecting said transmitted radiation in said receiving means'"'"' limited field-of-view, wherein the presence of said transmitted radiation according to the particular digital transmission code sequence is indicative of a friendly target object.

2. A system as in claim 1 further comprising:

storage means in communication with said transmitting means for electronically storing a plurality of the digital transmission code sequences; and

means for selecting the particular digital transmission code sequence from said stored plurality.

3. A system as in claim 2 wherein said selecting means is an electronic keypad in communication with said storage means.

4. A system as in claim 2, wherein said storage means is a read only memory (ROM).

5. A system as in claim 2 further including means for preventing unauthorized movement of said transmitting and receiving means and unauthorized access to said stored plurality of digital transmission code sequences.

6. A system as in claim 5 wherein said preventing means comprises a self-destruct circuit connected to said storage means, said circuit being activated in response to one of said unauthorized movements or unauthorized accesses.

7. A system as in claim 1 wherein said transmitted radiation is in the infrared spectrum.

8. In a combat zone having friendly and unfriendly objects residing therein, a system comprising:

at least one transmitter, mounted on each friendly object, for radiating an infrared signal simultaneously in all directions therefrom in the form of code, short burst data packets, wherein the infrared signal is indicative of a particular digital transmission code;

an infrared receiver, mounted on each friendly object, configured to selectively target one of the objects in the combat zone and detect the presence of the infrared signal; and

processing means, connected to said receiver and provided with a code indicative of friendly objects, for decoding the detected infrared signal into the particular digital transmission code and for comparing the particular digital transmission code to the provided friendly objects code wherein a match therebetween indicates that the selectively targeted object is friendly.

9. A system as in claim 8 further comprising:

means for storing a plurality of codes used for both the particular digital transmission code and the provided friendly objects code; and

means for selecting the particular digital transmission code and the provided friendly objects code from the stored plurality.

10. A system as in claim 9 further comprising means for preventing unauthorized movement of said at least one transmitter or said receiver and for preventing unauthorized access to the stored plurality.

11. A system as in claim 10 wherein said preventing means comprises a self-destruct circuit connected to said storing means, said circuit being activated in response to one of said unauthorized movements or unauthorized accesses.

12. A system as in claim 9 wherein said storing means is a read only memory (ROM).

13. A system as in claim 9 wherein said selecting means is an input receiving means, connecting said storing means to said at least one transmitter and said receiver, for receiving inputs indicative of the particular digital transmission code and the friendly objects code.

14. A system as in claim 8 further comprising:

first modifying means for modifying the particular digital transmission code; and

second modifying means for modifying the friendly objects code.