Spread spectrum underwater location beacon system

Details Spread spectrum underwater location beacon system Spread spectrum underwater location beacon system

1989-07-20

1990-08-21

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Transponders

367117, 367134, 367135, 367137, H04B 159

Patent

active

049512633

ABSTRACT:
An underwater location beacon emits a continuous wave signal which is phase-shift modulated by a pseudo-noise, spread spectrum code. This signal is detected with an exact replica of the transmitted code. To an unauthorized observer without the replica, the transponder's signal is indistinguishable from background ocean noise. The spread spectrum code allows extraction of the signal from high levels of ocean noise, providing an increased detection range, jamming resistance, covertness, and unique signals for each pinger. The outputs of the surface spread spectrum receiver are used with automated location algorithms. Several receivers at different surface positions provide the underwater coordinates of the pinger's location.

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 3992692 (1976-11-01), Filer
patent: 4081784 (1978-03-01), Wilson et al.
patent: 4109100 (1978-08-01), Unkauf
patent: 4847817 (1989-07-01), Au et al.

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