Estimation of background noise and its effect on sonar range...

Details Estimation of background noise and its effect on sonar range... Estimation of background noise and its effect on sonar range...

2007-10-30

2007-10-30

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S099000, C367S131000

Reexamination Certificate

active

10559741

ABSTRACT:
A system and method for estimating the SNR in a sonar environment and for determining the effect of the estimated SNR on sonar ranging accuracy. The system includes a sensor, a transmitter, a receiver, a plurality of band-pass filters, a cross correlator, and a data analyzer. The transmitter transmits a first signal having a predetermined frequency range through a transmission medium. The sensor generates a second signal corresponding to an echo signal reflected from an object. The first and second signals are provided to the band-pass filters, each operative to pass a respective sub-band of frequencies. The filters provide filtered versions of the first and second signals to the cross correlator, which performs cross correlation operations on the filtered signals. A data analyzer analyzes the cross correlator output data to determine the variability of cross correlation peaks within each frequency sub-band, thereby allowing more accurate SNR estimations in noisy environments.

REFERENCES:
patent: 3681747 (1972-08-01), Walsh
patent: 4831602 (1989-05-01), Kroenert et al.
patent: 4847817 (1989-07-01), Au et al.
patent: 5481504 (1996-01-01), Rosenbach et al.

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