Spatial rejection of direct blast interference in multistatic so

Details Spatial rejection of direct blast interference in multistatic so Spatial rejection of direct blast interference in multistatic so

1993-12-16

1995-06-13

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Underwater system

367900, 367901, 367119, 367 98, G01S 1502

Patent

active

054250005

ABSTRACT:
A multistatic sonar system (50) employing a short duration automatic gain control (AGC) following beamforming of the return signal to reject spatial transients at the sonar waveform leading and trailing edges. The output of the beamformer (58) is delayed by a delay line (60A) before passing through a programmable gain (60B). The magnitude of an undelayed version of the beamformer output is also squared (60D) and averaged over a time window (60E). This average is used to normalize the delayed value of the beamformer output. The normalized output of the beamformer is compared (60C) with a threshold having a value much greater than unity, and the comparator output controls the gain circuit (60B). When the normalized value of the beamformer output exceeds the threshold value, the gain of the AGC is set to a value much smaller than unity. When the normalized value of the beamformer output does not exceed the threshold, the gain of the AGC is set to unity.

REFERENCES:
patent: 3763490 (1973-10-01), Hadley et al.
patent: 4316270 (1982-02-01), Van't Hullenaar
patent: 5251185 (1993-10-01), Baggenstoss
"An Algorithm for Linearly Constrained Adaptive Array Processing," O. L. Frost, Proceedings of the IEEE, vol. 60, No. 8, Aug. 1972.

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