Echo ranging pulse discrimination circuit

Details Echo ranging pulse discrimination circuit Echo ranging pulse discrimination circuit

1980-07-02

1982-02-09

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

343 5SM, 364517, 367900, G01S 1504

Patent

active

043153259

ABSTRACT:
An improved echo ranging system is disclosed which features improved circuitry for discrimination of received reflected pulses from noise. Discrimination is performed by comparison of the input pulses to a time-varying threshold voltage wherein the threshold function varies in accordance with the predicted attenuation of the transmitted echo signal over its path. In this way, variable gain elements used to amplify the received signal prior to comparison it with a fixed threshold height can be eliminated, thus rendering the circuitry less complicated, expensive, and calibration free.

REFERENCES:
patent: 4000650 (1977-01-01), Snyder
patent: 4023168 (1977-05-01), Bruder et al.
patent: 4079376 (1978-03-01), Kirk, Jr.
patent: 4145741 (1979-03-01), Nappin
patent: 4169263 (1979-09-01), Hooker, Jr.

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