Echo ranging pulse discrimination circuit
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United States of America Patent
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Feb 9, 1982
Grant Date -
N/A
app pub date -
Jul 2, 1980
filing date -
Jul 2, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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