Ranging system with resolution of correlator ambiguities

Details Ranging system with resolution of correlator ambiguities Ranging system with resolution of correlator ambiguities

1975-10-28

1977-10-18

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

343100CL, G01S 968

Patent

active

040548627

ABSTRACT:
A ranging system, particularly useful for sonic depth sounding employing a receiver utilizing one bit sampling of received echoes. A correlator correlates a sequence of one bit samples against a sequence of reference samples, such a sequence of reference samples being conveniently provided by a transmitter of sound waves. An envelope detector circuit provides the envelope of received echoes and a peak detector provides the time of occurrence of the peak of the envelope. A gate generator responsive to the time of occurrence of the envelope peak provides a gate signal which brackets a succession of output pulse signals from the correlator to delineate coarse range or depth while individual output pulses within the gated interval are applied to a second peak detector to give a range or a depth reading corresponding to the time of occurrence of the maximum output pulse of the correlator.

REFERENCES:
patent: 3454922 (1969-07-01), Dory
patent: 3750152 (1973-07-01), Waful
patent: 3786405 (1974-01-01), Chramiec et al.

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