Circuit and method for determining time of arrival

Details Circuit and method for determining time of arrival Circuit and method for determining time of arrival

1995-12-06

1998-03-10

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

342135, 327 69, 327 72, G01C 308, G01S 1308

Patent

active

057267421

ABSTRACT:
An improved circuit and method of making precise time of arrival measurements on optical pulse data of relatively varying widths. The invention provides an analog input pulse representing received optical pulse data, along with a delayed version of the analog input pulse. The time of delay is set such that the original analog pulse and the delayed analog pulse cross each other at a predetermined point. This cross-over consistently occurs at the same point on the signal independent of the size or shape of the analog pulse. Preferably, the cross-over occurs at approximately 70% of the analog pulse amplitude. The cross-over point between the original pulse and the delayed pulse triggers the generation of the leading edge of a time of arrival pulse.

REFERENCES:
patent: 3763436 (1973-10-01), Haw
patent: 4518964 (1985-05-01), Hetyei
patent: 4676660 (1987-06-01), King et al.
patent: 4849644 (1989-07-01), Mira et al.
patent: 5382848 (1995-01-01), Borns et al.

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