Pulse or digital communications – Receivers
Patent
1996-01-17
1997-12-30
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
367 21, H04L 2706
Patent
active
057039062
ABSTRACT:
A signal processing system provides and processes a digital signal, generd in response to an analog signal, which includes a noise component and possibly also an information component representing three mutually orthogonal items of measurement information representable as a sample point in a symbolic Cartesian three-dimensional spatial reference system. A noise likelihood determination sub-system receives the digital signal and generates a random noise assessment of whether or not the digital signal comprises solely random noise, and if not, generates an assessment of degree-of-randomness. The noise likelihood determination system controls the operation of an information processing sub-system for extracting the information component in response to the random noise assessment or a combination of the random noise assessment and the degree-of-randomness assessment. The information processing system is illustrated as combat control equipment for submarine warfare, which utilizes a sonar signal produced by a towed linear transducer array, and whose mode operation employs three orthogonally related dimensions of data, namely: (i) clock time associated with the interval of time over which the sample point measurements are taken, (ii) conical angle representing bearing of a passive sonar contact derived from the signal produced by the towed array, and (iii) a frequency characteristic of the sonar signal.
REFERENCES:
patent: 4063180 (1977-12-01), Norman
patent: 5161185 (1992-11-01), Hochschild
patent: 5333153 (1994-07-01), Brown et al.
Hammel Sherry E.
Nguyen Chung T.
O'Brien, Jr. Francis J.
Ghebretinsae Temesghen
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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