G - Physics – 01 – S
Patent
G - Physics
01
S
349/33
G01S 15/02 (2006.01) G01S 1/00 (2006.01)
Patent
CA 1294357
A B S T R A C T (Fig. 1) In a method of indicating the time of an acoustic pulse at the transmission or reception of the same, the acoustic pulse is a wave package, the amplitude envelope of which having an ascending and a descending flank. The method is characterized in that the beginning of the descending flank of the amplitude envelope is detected for determining of a reference time In the wave package, that a predetermined zero crossing in the wave package is identified from the reference time and that the time of the identified zero crossing is determined. A device for carrying out the method and for use in an acoustic system (1) comprising means (3) for generating of an electric signal (E1,E2) corresponding to the acoustic pulse (P1,P2), is characterized by first means (9) arranged to detect the beginning of the descending flank of the electric signal for determining of the reference time of the wave package and to generate a trigger signal (C) corresponding to the reference time, and second means (10) arranged to respond to the trigger signal (C) for identifying the predetermined zero crossing in the wave package and to generate a time signal (D) corresponding to the identified zero crossing (D).
517105
Fetherstonhaugh & Co.
Saab Marine Electronics Ab
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