Digital sounder module and method for detecting

Details Digital sounder module and method for detecting Digital sounder module and method for detecting

2005-09-27

2005-09-27

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S107000, C367S900000

Reexamination Certificate

active

06950372

ABSTRACT:
The invention is a digital sounder module and its method for detection. The digital sounder module includes a sonar carrier wave producing means, a band-pass filter, a pre-amplifier for providing a high sensitivity and extending a wide dynamic range, and an analog-to-digital converter for providing a digital implementation of a superheterodyne detector and producing an intermediate frequency. The digital sounder module also includes a programmable logic device for controlling a gain of the pre-amplifier and for digitally filtering the intermediate frequency and a microprocessor. The method implemented by the controlled per-amplifier gain processes the return echo signal by controlled ramp up of the gain over time to compensate for the change in signal strength in proportion to the length of the return path.

REFERENCES:
patent: 4000650 (1977-01-01), Snyder
patent: 6418080 (2002-07-01), Inouchi
patent: 6445646 (2002-09-01), Handa et al.
patent: 505896 (2000-07-01), None

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