Method for improved range accuracy in laser range finders

Details Method for improved range accuracy in laser range finders Method for improved range accuracy in laser range finders

2005-01-11

2005-01-11

Wong, Don (Department: 2828)

Optics: measuring and testing

Range or remote distance finding

With photodetection

Reexamination Certificate

active

06842231

ABSTRACT:
The range of a threshold detection laser range finder is increased by adding a low cost Analog-to-Digital converter and sampling a portion of a reflected laser pulse. The slope of the sampled reflected laser pulse is calculated and the shape of the reflected laser pulse is inferred from known shapes. The center point of the inferred shape is approximated using a lookup table, and a correction value is calculated based on the center point of the inferred shape and the sampled portion. The correction value is applied to an uncorrected range estimate to arrive at an accurate estimate of the range of the object of interest.

REFERENCES:
patent: 5574552 (1996-11-01), Dunne
patent: 5726742 (1998-03-01), Nourrcier
patent: 5923428 (1999-07-01), Woodworth
patent: 5926259 (1999-07-01), Bamberger et al.
patent: 6310682 (2001-10-01), Gavish et al.
patent: 6339740 (2002-01-01), Seto et al.
patent: 6392747 (2002-05-01), Allen et al.

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