Patent Number: 6,169,706

Title: Echo detection in pulse-echo ranging systems

Abstract: A method for processing an echo amplitude profile generated by an echo ranging system with reference to a temporal axis to identify return echoes comprised by the profile by identifying amplitude peaks in the profile above with respect to an amplitude axis, a threshold curve on the same temporal axis, wherein the threshold curve is generated by identifying rising edges of echoes in the profile, and generating curve segments extending on the temporal axis from points at or above said leading edges to intersections with descending edges of echoes in the profile, whereby to trace echo base lines delimiting access of the echoes. The invention also extends to a method for processing an echo amplitude profile. According to a further feature of the invention, there is provided a method for processing an echo amplitude profile generated by an echo ranging system with reference to a temporal axis to identify return echoes comprised by the profile by identifying amplitude peaks in the profile above with respect to an amplitude axis, threshold curve on the same temporal axis, whereby to define echo base lines delimiting areas of the echoes, comprising identifying the position of at least a selected echo on the temporal axis by determining the temporal position of the center of area of at least the selected one of the areas so delimited.

Inventors: Woodward; Steven J. (Port Hope, CA), Bednarchuk; Thomas Mike (Havelock, CA)

Assignee: Milltronics Ltd.

International Classification: G01F 23/296 (20060101); G01S 7/523 (20060101); G01S 7/527 (20060101); G01S 7/292 (20060101); G01S 015/08 (); G01S 013/08 (); G01F 023/00 ()

Expiration Date: 01/02/2018