Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1984-12-12
1996-01-02
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367 46, 364582, 364517, G06F 15336, G01R 2316, G81C 2700
Patent
active
054815037
ABSTRACT:
The invention discloses an apparatus for and a method of adaptively processing a sonar power spectrum for improving the display of narrowband line structure characteristic of a target in a background of broadband interference which is rippled due to multipath propagation arrival structure. The processor employs a first Fourier transformer to convert the sonar frequency data into a complex correlation format. The autocorrelation is then time difference sampled to separate the broadband ripple interference from the broadband trend interference. The separate time difference samples are then transformed back to their real frequency format to form a broadband ripple estimate and a broadband trend estimate of the interference background. The ripple estimate is subtracted from the sonar signal to remove the ripple component and the resulting difference is normalized by a division by the interference trend estimate. The result is improved detectability of the narrowband lines in the presence of widely varying multipath interference.
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Heath Thomas S.
Kuhn John P.
Checkovich Paul
Martin Marietta Corporation
Moskowitz Nelson
Young Stephen A.
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