Covert communication system

Details Covert communication system Covert communication system

1994-07-19

1997-06-17

Chin, Stephen

Pulse or digital communications

Pulse position, frequency, or spacing modulation

375343, 370213, H03K 704

Patent

active

056404190

ABSTRACT:
A covert communication system utilizes a series of low level duty cycle coded pulse train transmissions which at the necessary end have signal to noise ratios much smaller than unity. Such transmissions are buried in noise and hence are undetectable by ordinary means. The coded pulse trains do not carry data and their sole purpose is only to be compressed by a code matched correlator into a single large pulse per pulse train. Data are encoded in the timing between adjacent compressed pulses of adjacent pulse trains. The low duty cycle of the pulse trains is used to force an unfriendly receiver, which does not know the code of the pulse train transmissions, to integrate its own receiver noise into its detection circuits, thus making the transmissions even less detectable.

REFERENCES:
patent: 5029184 (1991-07-01), Andren et al.

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