Detector employing logic circuitry for the selective screening o

Details Detector employing logic circuitry for the selective screening o Detector employing logic circuitry for the selective screening o

1970-08-07

1998-05-19

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

G01S 380

Patent

active

057544964

ABSTRACT:
The invention disclosed is a run-by detector for a passive homing torpedo. he detector will signal the torpedo that it has passed by the acoustic source under attack, thus enabling the weapon programmer to initiate a reattack or new search maneuver. The detector will, on the basis of measured acoustic energy level, differentiate between the run-by of a real target and the run-by of a high-energy jammer or decoy.
The detector is a logic circuit which makes use of two indications which occur when an acoustic source is passed by a relatively short range. First, the source which had been close to the axis of the torpedo motion (boresight) will move rapidly in angle to well off weapon boresight. Second, the measured acoustic level of the source drops at pass-by due to the highly directional character of the typical torpedo's transducer receiver. Appropriate thresholds are applied to these two indicator signals; and their near coincident occurance in time is the basis for a run-by detection. An additional circuit inhibits the detector if a pulsing countermeasure is in the near environment, since such countermeasure pulses could invalidate the source level excursion clue described above.

REFERENCES:
patent: 2987700 (1961-06-01), Hawkins
patent: 3125953 (1964-03-01), Foerster

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