Friend-foe interrogation method and a system using this method

Details Friend-foe interrogation method and a system using this method Friend-foe interrogation method and a system using this method

1985-12-06

1989-03-21

Cangialosi, Salvatore

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

Radar transponder system

Iff or sif

380 23, G01S 956, H04L 900

Patent

active

048147699

ABSTRACT:
For carrying out an interrogation a position modulated laser light wave is used. A key word is displayed in an interrogator and coded in accordance with a cyclic code, for example Golay's code. This coded key word is used for modulating the laser wave. In the responder the same key word is displayed and coded in the same way. After reception and demodulation each message is compared in a correlation circuit with the local reference word. The correlation method used allows parasite pulses to be taken into account and the word received to be validated with a given security threshold.

REFERENCES:
patent: 4194201 (1980-03-01), Stein
patent: 4322729 (1982-03-01), Honold et al.
patent: 4364049 (1982-12-01), Moore et al.
patent: 4384288 (1983-05-01), Walton
patent: 4427980 (1984-01-01), Fennell et al.
patent: 4584720 (1986-04-01), Garrett

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