Airborne fiber optic decoy architecture

Details Airborne fiber optic decoy architecture Airborne fiber optic decoy architecture

1991-05-14

1992-08-04

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Ecm

G01S 738

Patent

active

051362953

ABSTRACT:
One or more decoys (22) are towed by an aircraft (18) to confuse hostile radar. The tow lines (20) to the decoys (22) include fiber optic components which optically transmit to the decoys (22) both radio frequency signals for retransmission to hostile radar (24), and direct current power. The fiber optic components absorb strain forces imposed by towing the decoys (22). Multiple decoys (22) are deployed at varying distances from the aircraft (18) to increase the overall range of frequencies covered by the system, simulate a plurality of false targets, or accomplish angle gate deception. The deception may be accomplished by transmitting signals from the decoys in sequence and can be enhanced by dynamically varying the power levels of the decoy transmitting antennas. The fiber optic components may be separate optical fibers deployed separately or joined together for simultaneous deployment. The preferred configuration is a single optical fiber with coaxial inner and outer cores. The decoy preferably has a transmitting antenna in the form of a simulated biconical dipole. In one embodiment, both halves of the dipole are simulated by a set of fins. In another embodiment, the forward half is simulated by a truncated cone.

REFERENCES:
patent: 3897028 (1975-07-01), Doellner
patent: 3924232 (1975-12-01), Burdi et al.
patent: 4149166 (1979-04-01), Null
patent: 4439767 (1984-03-01), Hefley et al.
patent: 4808999 (1989-04-01), Toman
"Optically Powered Sensors for EMI Immune Aviation Sensing Systems"; by Paul Bjork and Jim Lenz; SPIE vol. 1173 Fiber Optic Systems for Mobile Platforms III (1989); Honeywell Systems and Research Center, Minneapolis, Minn., pp. 175-186.

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