Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1997-11-05
1998-09-01
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
G01S 1589
Patent
active
058020128
ABSTRACT:
A synthetic-aperture sonar system of the present invention includes a range curvature compensating section having a divided aperture propagation time calculation 32. The calculation 32 calculates a round-trip signal propagation time on the basis of a divided aperture for transmission and a divided aperture for reception, thereby calculating a range curvature correction time. A transmission/reception section includes a PRF (Pulse Repetition Frequency) modificator and a divided aperture switch. The PRF modificator adjusts PRF such that a ratio between the aperture length and the divided aperture length of the transducer is an integral multiple. The divided aperture switch 16 switches the outputs of elements on the transducer each being assigned to one of the divided apertures, produces a sum of the outputs of the individual element on each divided-aperture, and feeds the sum to a range compressing section. With this configuration, the system reduces range curvature compensation errors, prevents the transducer from being scaled up, and eases limitations on the number of multi-transmission/reception ascribable to a platform speed.
REFERENCES:
Kondo et al., "Digital Signal Processing for Measurement and Sensors" Shoko-Do pp. 74-88 (1993).
Bruce, "A Processing Requirement and Resolution Capability Comparison of Side-Scan and Synthetic-Aperture Sonars" IEEE Journal of Occanic Engineering 17:106 and 110-113 (1992).
NEC Corporation
Pihulic Daniel T.
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