Selective wavelength identification friend or foe (SWIFF)

Details Selective wavelength identification friend or foe (SWIFF) Selective wavelength identification friend or foe (SWIFF)

1996-02-28

1997-11-11

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502032, 359154, 342 45, G01J 350

Patent

active

056867220

ABSTRACT:
An optical identification friend-or-foe (IFF) system for vehicles comprises a Selective Wavelength IFF (SWIFF) system with a tunable optical beacon being located on each similarly equipped vehicle. That tunable optical beacon includes a light source and wavelength encoder which can select a number of narrow-band optical wavelengths for emission from the beacon, those selected wavelengths forming an identification code for a vehicle. The optical beacon directs the selected wavelengths along an optical path to a diffuser which can irradiate a wide field-of-view around the vehicle with those selected wavelength for detection and identification by other friendly vehicles. The light source may be one that emits a broad range of wavelengths with the encoder providing a number of narrow-band optical filters which can be selectively positioned in the optical path from the light source to the diffuser. Alternatively, the light source and encoder could be a wavelength agile laser source or an array of laser diodes emitting at specific wavelengths and a control unit to select the wavelengths emitted by the laser source or array of diodes. This optical SWIFF system provides a high level of covertness and degree of confidence in the identification of vehicles as being friend-or-foe.

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