PULSE TIME OF ARRIVAL DETECTION APPARATUS FOR PRECISION DISTANCE MEASURING EQUIPMENT APPLICATIONS

摘要

2113910 9303398 PCTABS00019 An apparatus to be employed within a precision distance measuring system for estimating pulse time-of-arrival. The apparatus facilitates the use of an Adaptative Fixed Threshold method for such estimation. The invention compensates for pulse time detection errors induced by variations in incident pulse amplitude and shape by adjusting the estimated time-of-arrival. This adjustment is performed as a function of the measured pulse slope between two low-amplitude threshold levels through the use of a predetermined reference table of error adjustment times.